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cpython/Lib/test/test_descr.py

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import builtins
import copyreg
import gc
import itertools
import math
import pickle
import sys
import types
import unittest
import weakref
from copy import deepcopy
from test import support
class OperatorsTest(unittest.TestCase):
def __init__(self, *args, **kwargs):
unittest.TestCase.__init__(self, *args, **kwargs)
self.binops = {
'add': '+',
'sub': '-',
'mul': '*',
'matmul': '@',
'truediv': '/',
'floordiv': '//',
'divmod': 'divmod',
'pow': '**',
'lshift': '<<',
'rshift': '>>',
'and': '&',
'xor': '^',
'or': '|',
'cmp': 'cmp',
'lt': '<',
'le': '<=',
'eq': '==',
'ne': '!=',
'gt': '>',
'ge': '>=',
}
for name, expr in list(self.binops.items()):
if expr.islower():
expr = expr + "(a, b)"
else:
expr = 'a %s b' % expr
self.binops[name] = expr
self.unops = {
'pos': '+',
'neg': '-',
'abs': 'abs',
'invert': '~',
'int': 'int',
'float': 'float',
}
for name, expr in list(self.unops.items()):
if expr.islower():
expr = expr + "(a)"
else:
expr = '%s a' % expr
self.unops[name] = expr
def unop_test(self, a, res, expr="len(a)", meth="__len__"):
d = {'a': a}
self.assertEqual(eval(expr, d), res)
t = type(a)
m = getattr(t, meth)
# Find method in parent class
while meth not in t.__dict__:
t = t.__bases__[0]
# in some implementations (e.g. PyPy), 'm' can be a regular unbound
# method object; the getattr() below obtains its underlying function.
self.assertEqual(getattr(m, 'im_func', m), t.__dict__[meth])
self.assertEqual(m(a), res)
bm = getattr(a, meth)
self.assertEqual(bm(), res)
def binop_test(self, a, b, res, expr="a+b", meth="__add__"):
d = {'a': a, 'b': b}
self.assertEqual(eval(expr, d), res)
t = type(a)
m = getattr(t, meth)
while meth not in t.__dict__:
t = t.__bases__[0]
# in some implementations (e.g. PyPy), 'm' can be a regular unbound
# method object; the getattr() below obtains its underlying function.
self.assertEqual(getattr(m, 'im_func', m), t.__dict__[meth])
self.assertEqual(m(a, b), res)
bm = getattr(a, meth)
self.assertEqual(bm(b), res)
def sliceop_test(self, a, b, c, res, expr="a[b:c]", meth="__getitem__"):
d = {'a': a, 'b': b, 'c': c}
self.assertEqual(eval(expr, d), res)
t = type(a)
m = getattr(t, meth)
while meth not in t.__dict__:
t = t.__bases__[0]
# in some implementations (e.g. PyPy), 'm' can be a regular unbound
# method object; the getattr() below obtains its underlying function.
self.assertEqual(getattr(m, 'im_func', m), t.__dict__[meth])
self.assertEqual(m(a, slice(b, c)), res)
bm = getattr(a, meth)
self.assertEqual(bm(slice(b, c)), res)
def setop_test(self, a, b, res, stmt="a+=b", meth="__iadd__"):
d = {'a': deepcopy(a), 'b': b}
exec(stmt, d)
self.assertEqual(d['a'], res)
t = type(a)
m = getattr(t, meth)
while meth not in t.__dict__:
t = t.__bases__[0]
# in some implementations (e.g. PyPy), 'm' can be a regular unbound
# method object; the getattr() below obtains its underlying function.
self.assertEqual(getattr(m, 'im_func', m), t.__dict__[meth])
d['a'] = deepcopy(a)
m(d['a'], b)
self.assertEqual(d['a'], res)
d['a'] = deepcopy(a)
bm = getattr(d['a'], meth)
bm(b)
self.assertEqual(d['a'], res)
def set2op_test(self, a, b, c, res, stmt="a[b]=c", meth="__setitem__"):
d = {'a': deepcopy(a), 'b': b, 'c': c}
exec(stmt, d)
self.assertEqual(d['a'], res)
t = type(a)
m = getattr(t, meth)
while meth not in t.__dict__:
t = t.__bases__[0]
# in some implementations (e.g. PyPy), 'm' can be a regular unbound
# method object; the getattr() below obtains its underlying function.
self.assertEqual(getattr(m, 'im_func', m), t.__dict__[meth])
d['a'] = deepcopy(a)
m(d['a'], b, c)
self.assertEqual(d['a'], res)
d['a'] = deepcopy(a)
bm = getattr(d['a'], meth)
bm(b, c)
self.assertEqual(d['a'], res)
def setsliceop_test(self, a, b, c, d, res, stmt="a[b:c]=d", meth="__setitem__"):
dictionary = {'a': deepcopy(a), 'b': b, 'c': c, 'd': d}
exec(stmt, dictionary)
self.assertEqual(dictionary['a'], res)
t = type(a)
while meth not in t.__dict__:
t = t.__bases__[0]
m = getattr(t, meth)
# in some implementations (e.g. PyPy), 'm' can be a regular unbound
# method object; the getattr() below obtains its underlying function.
self.assertEqual(getattr(m, 'im_func', m), t.__dict__[meth])
dictionary['a'] = deepcopy(a)
m(dictionary['a'], slice(b, c), d)
self.assertEqual(dictionary['a'], res)
dictionary['a'] = deepcopy(a)
bm = getattr(dictionary['a'], meth)
bm(slice(b, c), d)
self.assertEqual(dictionary['a'], res)
def test_lists(self):
# Testing list operations...
# Asserts are within individual test methods
self.binop_test([1], [2], [1,2], "a+b", "__add__")
self.binop_test([1,2,3], 2, 1, "b in a", "__contains__")
self.binop_test([1,2,3], 4, 0, "b in a", "__contains__")
self.binop_test([1,2,3], 1, 2, "a[b]", "__getitem__")
self.sliceop_test([1,2,3], 0, 2, [1,2], "a[b:c]", "__getitem__")
self.setop_test([1], [2], [1,2], "a+=b", "__iadd__")
self.setop_test([1,2], 3, [1,2,1,2,1,2], "a*=b", "__imul__")
self.unop_test([1,2,3], 3, "len(a)", "__len__")
self.binop_test([1,2], 3, [1,2,1,2,1,2], "a*b", "__mul__")
self.binop_test([1,2], 3, [1,2,1,2,1,2], "b*a", "__rmul__")
self.set2op_test([1,2], 1, 3, [1,3], "a[b]=c", "__setitem__")
self.setsliceop_test([1,2,3,4], 1, 3, [5,6], [1,5,6,4], "a[b:c]=d",
"__setitem__")
def test_dicts(self):
# Testing dict operations...
self.binop_test({1:2,3:4}, 1, 1, "b in a", "__contains__")
self.binop_test({1:2,3:4}, 2, 0, "b in a", "__contains__")
self.binop_test({1:2,3:4}, 1, 2, "a[b]", "__getitem__")
d = {1:2, 3:4}
l1 = []
for i in list(d.keys()):
l1.append(i)
l = []
for i in iter(d):
l.append(i)
self.assertEqual(l, l1)
l = []
for i in d.__iter__():
l.append(i)
self.assertEqual(l, l1)
l = []
for i in dict.__iter__(d):
l.append(i)
self.assertEqual(l, l1)
d = {1:2, 3:4}
self.unop_test(d, 2, "len(a)", "__len__")
self.assertEqual(eval(repr(d), {}), d)
self.assertEqual(eval(d.__repr__(), {}), d)
self.set2op_test({1:2,3:4}, 2, 3, {1:2,2:3,3:4}, "a[b]=c",
"__setitem__")
# Tests for unary and binary operators
def number_operators(self, a, b, skip=[]):
dict = {'a': a, 'b': b}
for name, expr in self.binops.items():
if name not in skip:
name = "__%s__" % name
if hasattr(a, name):
res = eval(expr, dict)
self.binop_test(a, b, res, expr, name)
for name, expr in list(self.unops.items()):
if name not in skip:
name = "__%s__" % name
if hasattr(a, name):
res = eval(expr, dict)
self.unop_test(a, res, expr, name)
def test_ints(self):
# Testing int operations...
self.number_operators(100, 3)
# The following crashes in Python 2.2
self.assertEqual((1).__bool__(), 1)
self.assertEqual((0).__bool__(), 0)
# This returns 'NotImplemented' in Python 2.2
class C(int):
def __add__(self, other):
return NotImplemented
self.assertEqual(C(5), 5)
try:
C() + ""
except TypeError:
pass
else:
self.fail("NotImplemented should have caused TypeError")
def test_floats(self):
# Testing float operations...
self.number_operators(100.0, 3.0)
def test_complexes(self):
# Testing complex operations...
self.number_operators(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge',
'int', 'float',
'floordiv', 'divmod', 'mod'])
class Number(complex):
__slots__ = ['prec']
def __new__(cls, *args, **kwds):
result = complex.__new__(cls, *args)
result.prec = kwds.get('prec', 12)
return result
def __repr__(self):
prec = self.prec
if self.imag == 0.0:
return "%.*g" % (prec, self.real)
if self.real == 0.0:
return "%.*gj" % (prec, self.imag)
return "(%.*g+%.*gj)" % (prec, self.real, prec, self.imag)
__str__ = __repr__
a = Number(3.14, prec=6)
self.assertEqual(repr(a), "3.14")
self.assertEqual(a.prec, 6)
a = Number(a, prec=2)
self.assertEqual(repr(a), "3.1")
self.assertEqual(a.prec, 2)
a = Number(234.5)
self.assertEqual(repr(a), "234.5")
self.assertEqual(a.prec, 12)
def test_explicit_reverse_methods(self):
# see issue 9930
self.assertEqual(complex.__radd__(3j, 4.0), complex(4.0, 3.0))
self.assertEqual(float.__rsub__(3.0, 1), -2.0)
@support.impl_detail("the module 'xxsubtype' is internal")
def test_spam_lists(self):
# Testing spamlist operations...
import copy, xxsubtype as spam
def spamlist(l, memo=None):
import xxsubtype as spam
return spam.spamlist(l)
# This is an ugly hack:
copy._deepcopy_dispatch[spam.spamlist] = spamlist
self.binop_test(spamlist([1]), spamlist([2]), spamlist([1,2]), "a+b",
"__add__")
self.binop_test(spamlist([1,2,3]), 2, 1, "b in a", "__contains__")
self.binop_test(spamlist([1,2,3]), 4, 0, "b in a", "__contains__")
self.binop_test(spamlist([1,2,3]), 1, 2, "a[b]", "__getitem__")
self.sliceop_test(spamlist([1,2,3]), 0, 2, spamlist([1,2]), "a[b:c]",
"__getitem__")
self.setop_test(spamlist([1]), spamlist([2]), spamlist([1,2]), "a+=b",
"__iadd__")
self.setop_test(spamlist([1,2]), 3, spamlist([1,2,1,2,1,2]), "a*=b",
"__imul__")
self.unop_test(spamlist([1,2,3]), 3, "len(a)", "__len__")
self.binop_test(spamlist([1,2]), 3, spamlist([1,2,1,2,1,2]), "a*b",
"__mul__")
self.binop_test(spamlist([1,2]), 3, spamlist([1,2,1,2,1,2]), "b*a",
"__rmul__")
self.set2op_test(spamlist([1,2]), 1, 3, spamlist([1,3]), "a[b]=c",
"__setitem__")
self.setsliceop_test(spamlist([1,2,3,4]), 1, 3, spamlist([5,6]),
spamlist([1,5,6,4]), "a[b:c]=d", "__setitem__")
# Test subclassing
class C(spam.spamlist):
def foo(self): return 1
a = C()
self.assertEqual(a, [])
self.assertEqual(a.foo(), 1)
a.append(100)
self.assertEqual(a, [100])
self.assertEqual(a.getstate(), 0)
a.setstate(42)
self.assertEqual(a.getstate(), 42)
@support.impl_detail("the module 'xxsubtype' is internal")
def test_spam_dicts(self):
# Testing spamdict operations...
import copy, xxsubtype as spam
def spamdict(d, memo=None):
import xxsubtype as spam
sd = spam.spamdict()
for k, v in list(d.items()):
sd[k] = v
return sd
# This is an ugly hack:
copy._deepcopy_dispatch[spam.spamdict] = spamdict
self.binop_test(spamdict({1:2,3:4}), 1, 1, "b in a", "__contains__")
self.binop_test(spamdict({1:2,3:4}), 2, 0, "b in a", "__contains__")
self.binop_test(spamdict({1:2,3:4}), 1, 2, "a[b]", "__getitem__")
d = spamdict({1:2,3:4})
l1 = []
for i in list(d.keys()):
l1.append(i)
l = []
for i in iter(d):
l.append(i)
self.assertEqual(l, l1)
l = []
for i in d.__iter__():
l.append(i)
self.assertEqual(l, l1)
l = []
for i in type(spamdict({})).__iter__(d):
l.append(i)
self.assertEqual(l, l1)
straightd = {1:2, 3:4}
spamd = spamdict(straightd)
self.unop_test(spamd, 2, "len(a)", "__len__")
self.unop_test(spamd, repr(straightd), "repr(a)", "__repr__")
self.set2op_test(spamdict({1:2,3:4}), 2, 3, spamdict({1:2,2:3,3:4}),
"a[b]=c", "__setitem__")
# Test subclassing
class C(spam.spamdict):
def foo(self): return 1
a = C()
self.assertEqual(list(a.items()), [])
self.assertEqual(a.foo(), 1)
a['foo'] = 'bar'
self.assertEqual(list(a.items()), [('foo', 'bar')])
self.assertEqual(a.getstate(), 0)
a.setstate(100)
self.assertEqual(a.getstate(), 100)
class ClassPropertiesAndMethods(unittest.TestCase):
def assertHasAttr(self, obj, name):
self.assertTrue(hasattr(obj, name),
'%r has no attribute %r' % (obj, name))
def assertNotHasAttr(self, obj, name):
self.assertFalse(hasattr(obj, name),
'%r has unexpected attribute %r' % (obj, name))
def test_python_dicts(self):
# Testing Python subclass of dict...
self.assertTrue(issubclass(dict, dict))
self.assertIsInstance({}, dict)
d = dict()
self.assertEqual(d, {})
self.assertIs(d.__class__, dict)
self.assertIsInstance(d, dict)
class C(dict):
state = -1
def __init__(self_local, *a, **kw):
if a:
self.assertEqual(len(a), 1)
self_local.state = a[0]
if kw:
for k, v in list(kw.items()):
self_local[v] = k
def __getitem__(self, key):
return self.get(key, 0)
def __setitem__(self_local, key, value):
self.assertIsInstance(key, type(0))
dict.__setitem__(self_local, key, value)
def setstate(self, state):
self.state = state
def getstate(self):
return self.state
self.assertTrue(issubclass(C, dict))
a1 = C(12)
self.assertEqual(a1.state, 12)
a2 = C(foo=1, bar=2)
self.assertEqual(a2[1] == 'foo' and a2[2], 'bar')
a = C()
self.assertEqual(a.state, -1)
self.assertEqual(a.getstate(), -1)
a.setstate(0)
self.assertEqual(a.state, 0)
self.assertEqual(a.getstate(), 0)
a.setstate(10)
self.assertEqual(a.state, 10)
self.assertEqual(a.getstate(), 10)
self.assertEqual(a[42], 0)
a[42] = 24
self.assertEqual(a[42], 24)
N = 50
for i in range(N):
a[i] = C()
for j in range(N):
a[i][j] = i*j
for i in range(N):
for j in range(N):
self.assertEqual(a[i][j], i*j)
def test_python_lists(self):
# Testing Python subclass of list...
class C(list):
def __getitem__(self, i):
if isinstance(i, slice):
return i.start, i.stop
return list.__getitem__(self, i) + 100
a = C()
a.extend([0,1,2])
self.assertEqual(a[0], 100)
self.assertEqual(a[1], 101)
self.assertEqual(a[2], 102)
self.assertEqual(a[100:200], (100,200))
def test_metaclass(self):
# Testing metaclasses...
class C(metaclass=type):
def __init__(self):
self.__state = 0
def getstate(self):
return self.__state
def setstate(self, state):
self.__state = state
a = C()
self.assertEqual(a.getstate(), 0)
a.setstate(10)
self.assertEqual(a.getstate(), 10)
class _metaclass(type):
def myself(cls): return cls
class D(metaclass=_metaclass):
pass
self.assertEqual(D.myself(), D)
d = D()
self.assertEqual(d.__class__, D)
class M1(type):
def __new__(cls, name, bases, dict):
dict['__spam__'] = 1
return type.__new__(cls, name, bases, dict)
class C(metaclass=M1):
pass
self.assertEqual(C.__spam__, 1)
c = C()
self.assertEqual(c.__spam__, 1)
class _instance(object):
pass
class M2(object):
@staticmethod
def __new__(cls, name, bases, dict):
self = object.__new__(cls)
self.name = name
self.bases = bases
self.dict = dict
return self
def __call__(self):
it = _instance()
# Early binding of methods
for key in self.dict:
if key.startswith("__"):
continue
setattr(it, key, self.dict[key].__get__(it, self))
return it
class C(metaclass=M2):
def spam(self):
return 42
self.assertEqual(C.name, 'C')
self.assertEqual(C.bases, ())
self.assertIn('spam', C.dict)
c = C()
self.assertEqual(c.spam(), 42)
# More metaclass examples
class autosuper(type):
# Automatically add __super to the class
# This trick only works for dynamic classes
def __new__(metaclass, name, bases, dict):
cls = super(autosuper, metaclass).__new__(metaclass,
name, bases, dict)
# Name mangling for __super removes leading underscores
while name[:1] == "_":
name = name[1:]
if name:
name = "_%s__super" % name
else:
name = "__super"
setattr(cls, name, super(cls))
return cls
class A(metaclass=autosuper):
def meth(self):
return "A"
class B(A):
def meth(self):
return "B" + self.__super.meth()
class C(A):
def meth(self):
return "C" + self.__super.meth()
class D(C, B):
def meth(self):
return "D" + self.__super.meth()
self.assertEqual(D().meth(), "DCBA")
class E(B, C):
def meth(self):
return "E" + self.__super.meth()
self.assertEqual(E().meth(), "EBCA")
class autoproperty(type):
# Automatically create property attributes when methods
# named _get_x and/or _set_x are found
def __new__(metaclass, name, bases, dict):
hits = {}
for key, val in dict.items():
if key.startswith("_get_"):
key = key[5:]
get, set = hits.get(key, (None, None))
get = val
hits[key] = get, set
elif key.startswith("_set_"):
key = key[5:]
get, set = hits.get(key, (None, None))
set = val
hits[key] = get, set
for key, (get, set) in hits.items():
dict[key] = property(get, set)
return super(autoproperty, metaclass).__new__(metaclass,
name, bases, dict)
class A(metaclass=autoproperty):
def _get_x(self):
return -self.__x
def _set_x(self, x):
self.__x = -x
a = A()
self.assertNotHasAttr(a, "x")
a.x = 12
self.assertEqual(a.x, 12)
self.assertEqual(a._A__x, -12)
class multimetaclass(autoproperty, autosuper):
# Merge of multiple cooperating metaclasses
pass
class A(metaclass=multimetaclass):
def _get_x(self):
return "A"
class B(A):
def _get_x(self):
return "B" + self.__super._get_x()
class C(A):
def _get_x(self):
return "C" + self.__super._get_x()
class D(C, B):
def _get_x(self):
return "D" + self.__super._get_x()
self.assertEqual(D().x, "DCBA")
# Make sure type(x) doesn't call x.__class__.__init__
class T(type):
counter = 0
def __init__(self, *args):
T.counter += 1
class C(metaclass=T):
pass
self.assertEqual(T.counter, 1)
a = C()
self.assertEqual(type(a), C)
self.assertEqual(T.counter, 1)
class C(object): pass
c = C()
try: c()
except TypeError: pass
else: self.fail("calling object w/o call method should raise "
"TypeError")
# Testing code to find most derived baseclass
class A(type):
def __new__(*args, **kwargs):
return type.__new__(*args, **kwargs)
class B(object):
pass
class C(object, metaclass=A):
pass
# The most derived metaclass of D is A rather than type.
class D(B, C):
pass
self.assertIs(A, type(D))
# issue1294232: correct metaclass calculation
new_calls = [] # to check the order of __new__ calls
class AMeta(type):
@staticmethod
def __new__(mcls, name, bases, ns):
new_calls.append('AMeta')
return super().__new__(mcls, name, bases, ns)
@classmethod
def __prepare__(mcls, name, bases):
return {}
class BMeta(AMeta):
@staticmethod
def __new__(mcls, name, bases, ns):
new_calls.append('BMeta')
return super().__new__(mcls, name, bases, ns)
@classmethod
def __prepare__(mcls, name, bases):
ns = super().__prepare__(name, bases)
ns['BMeta_was_here'] = True
return ns
class A(metaclass=AMeta):
pass
self.assertEqual(['AMeta'], new_calls)
new_calls.clear()
class B(metaclass=BMeta):
pass
# BMeta.__new__ calls AMeta.__new__ with super:
self.assertEqual(['BMeta', 'AMeta'], new_calls)
new_calls.clear()
class C(A, B):
pass
# The most derived metaclass is BMeta:
self.assertEqual(['BMeta', 'AMeta'], new_calls)
new_calls.clear()
# BMeta.__prepare__ should've been called:
self.assertIn('BMeta_was_here', C.__dict__)
# The order of the bases shouldn't matter:
class C2(B, A):
pass
self.assertEqual(['BMeta', 'AMeta'], new_calls)
new_calls.clear()
self.assertIn('BMeta_was_here', C2.__dict__)
# Check correct metaclass calculation when a metaclass is declared:
class D(C, metaclass=type):
pass
self.assertEqual(['BMeta', 'AMeta'], new_calls)
new_calls.clear()
self.assertIn('BMeta_was_here', D.__dict__)
class E(C, metaclass=AMeta):
pass
self.assertEqual(['BMeta', 'AMeta'], new_calls)
new_calls.clear()
self.assertIn('BMeta_was_here', E.__dict__)
# Special case: the given metaclass isn't a class,
# so there is no metaclass calculation.
marker = object()
def func(*args, **kwargs):
return marker
class X(metaclass=func):
pass
class Y(object, metaclass=func):
pass
class Z(D, metaclass=func):
pass
self.assertIs(marker, X)
self.assertIs(marker, Y)
self.assertIs(marker, Z)
# The given metaclass is a class,
# but not a descendant of type.
prepare_calls = [] # to track __prepare__ calls
class ANotMeta:
def __new__(mcls, *args, **kwargs):
new_calls.append('ANotMeta')
return super().__new__(mcls)
@classmethod
def __prepare__(mcls, name, bases):
prepare_calls.append('ANotMeta')
return {}
class BNotMeta(ANotMeta):
def __new__(mcls, *args, **kwargs):
new_calls.append('BNotMeta')
return super().__new__(mcls)
@classmethod
def __prepare__(mcls, name, bases):
prepare_calls.append('BNotMeta')
return super().__prepare__(name, bases)
class A(metaclass=ANotMeta):
pass
self.assertIs(ANotMeta, type(A))
self.assertEqual(['ANotMeta'], prepare_calls)
prepare_calls.clear()
self.assertEqual(['ANotMeta'], new_calls)
new_calls.clear()
class B(metaclass=BNotMeta):
pass
self.assertIs(BNotMeta, type(B))
self.assertEqual(['BNotMeta', 'ANotMeta'], prepare_calls)
prepare_calls.clear()
self.assertEqual(['BNotMeta', 'ANotMeta'], new_calls)
new_calls.clear()
class C(A, B):
pass
self.assertIs(BNotMeta, type(C))
self.assertEqual(['BNotMeta', 'ANotMeta'], new_calls)
new_calls.clear()
self.assertEqual(['BNotMeta', 'ANotMeta'], prepare_calls)
prepare_calls.clear()
class C2(B, A):
pass
self.assertIs(BNotMeta, type(C2))
self.assertEqual(['BNotMeta', 'ANotMeta'], new_calls)
new_calls.clear()
self.assertEqual(['BNotMeta', 'ANotMeta'], prepare_calls)
prepare_calls.clear()
# This is a TypeError, because of a metaclass conflict:
# BNotMeta is neither a subclass, nor a superclass of type
with self.assertRaises(TypeError):
class D(C, metaclass=type):
pass
class E(C, metaclass=ANotMeta):
pass
self.assertIs(BNotMeta, type(E))
self.assertEqual(['BNotMeta', 'ANotMeta'], new_calls)
new_calls.clear()
self.assertEqual(['BNotMeta', 'ANotMeta'], prepare_calls)
prepare_calls.clear()
class F(object(), C):
pass
self.assertIs(BNotMeta, type(F))
self.assertEqual(['BNotMeta', 'ANotMeta'], new_calls)
new_calls.clear()
self.assertEqual(['BNotMeta', 'ANotMeta'], prepare_calls)
prepare_calls.clear()
class F2(C, object()):
pass
self.assertIs(BNotMeta, type(F2))
self.assertEqual(['BNotMeta', 'ANotMeta'], new_calls)
new_calls.clear()
self.assertEqual(['BNotMeta', 'ANotMeta'], prepare_calls)
prepare_calls.clear()
# TypeError: BNotMeta is neither a
# subclass, nor a superclass of int
with self.assertRaises(TypeError):
class X(C, int()):
pass
with self.assertRaises(TypeError):
class X(int(), C):
pass
def test_module_subclasses(self):
# Testing Python subclass of module...
log = []
MT = type(sys)
class MM(MT):
def __init__(self, name):
MT.__init__(self, name)
def __getattribute__(self, name):
log.append(("getattr", name))
return MT.__getattribute__(self, name)
def __setattr__(self, name, value):
log.append(("setattr", name, value))
MT.__setattr__(self, name, value)
def __delattr__(self, name):
log.append(("delattr", name))
MT.__delattr__(self, name)
a = MM("a")
a.foo = 12
x = a.foo
del a.foo
self.assertEqual(log, [("setattr", "foo", 12),
("getattr", "foo"),
("delattr", "foo")])
# http://python.org/sf/1174712
try:
class Module(types.ModuleType, str):
pass
except TypeError:
pass
else:
self.fail("inheriting from ModuleType and str at the same time "
"should fail")
def test_multiple_inheritance(self):
# Testing multiple inheritance...
class C(object):
def __init__(self):
self.__state = 0
def getstate(self):
return self.__state
def setstate(self, state):
self.__state = state
a = C()
self.assertEqual(a.getstate(), 0)
a.setstate(10)
self.assertEqual(a.getstate(), 10)
class D(dict, C):
def __init__(self):
type({}).__init__(self)
C.__init__(self)
d = D()
self.assertEqual(list(d.keys()), [])
d["hello"] = "world"
self.assertEqual(list(d.items()), [("hello", "world")])
self.assertEqual(d["hello"], "world")
self.assertEqual(d.getstate(), 0)
d.setstate(10)
self.assertEqual(d.getstate(), 10)
self.assertEqual(D.__mro__, (D, dict, C, object))
# SF bug #442833
class Node(object):
def __int__(self):
return int(self.foo())
def foo(self):
return "23"
class Frag(Node, list):
def foo(self):
return "42"
self.assertEqual(Node().__int__(), 23)
self.assertEqual(int(Node()), 23)
self.assertEqual(Frag().__int__(), 42)
self.assertEqual(int(Frag()), 42)
def test_diamond_inheritence(self):
# Testing multiple inheritance special cases...
class A(object):
def spam(self): return "A"
self.assertEqual(A().spam(), "A")
class B(A):
def boo(self): return "B"
def spam(self): return "B"
self.assertEqual(B().spam(), "B")
self.assertEqual(B().boo(), "B")
class C(A):
def boo(self): return "C"
self.assertEqual(C().spam(), "A")
self.assertEqual(C().boo(), "C")
class D(B, C): pass
self.assertEqual(D().spam(), "B")
self.assertEqual(D().boo(), "B")
self.assertEqual(D.__mro__, (D, B, C, A, object))
class E(C, B): pass
self.assertEqual(E().spam(), "B")
self.assertEqual(E().boo(), "C")
self.assertEqual(E.__mro__, (E, C, B, A, object))
# MRO order disagreement
try:
class F(D, E): pass
except TypeError:
pass
else:
self.fail("expected MRO order disagreement (F)")
try:
class G(E, D): pass
except TypeError:
pass
else:
self.fail("expected MRO order disagreement (G)")
# see thread python-dev/2002-October/029035.html
def test_ex5_from_c3_switch(self):
# Testing ex5 from C3 switch discussion...
class A(object): pass
class B(object): pass
class C(object): pass
class X(A): pass
class Y(A): pass
class Z(X,B,Y,C): pass
self.assertEqual(Z.__mro__, (Z, X, B, Y, A, C, object))
# see "A Monotonic Superclass Linearization for Dylan",
# by Kim Barrett et al. (OOPSLA 1996)
def test_monotonicity(self):
# Testing MRO monotonicity...
class Boat(object): pass
class DayBoat(Boat): pass
class WheelBoat(Boat): pass
class EngineLess(DayBoat): pass
class SmallMultihull(DayBoat): pass
class PedalWheelBoat(EngineLess,WheelBoat): pass
class SmallCatamaran(SmallMultihull): pass
class Pedalo(PedalWheelBoat,SmallCatamaran): pass
self.assertEqual(PedalWheelBoat.__mro__,
(PedalWheelBoat, EngineLess, DayBoat, WheelBoat, Boat, object))
self.assertEqual(SmallCatamaran.__mro__,
(SmallCatamaran, SmallMultihull, DayBoat, Boat, object))
self.assertEqual(Pedalo.__mro__,
(Pedalo, PedalWheelBoat, EngineLess, SmallCatamaran,
SmallMultihull, DayBoat, WheelBoat, Boat, object))
# see "A Monotonic Superclass Linearization for Dylan",
# by Kim Barrett et al. (OOPSLA 1996)
def test_consistency_with_epg(self):
# Testing consistency with EPG...
class Pane(object): pass
class ScrollingMixin(object): pass
class EditingMixin(object): pass
class ScrollablePane(Pane,ScrollingMixin): pass
class EditablePane(Pane,EditingMixin): pass
class EditableScrollablePane(ScrollablePane,EditablePane): pass
self.assertEqual(EditableScrollablePane.__mro__,
(EditableScrollablePane, ScrollablePane, EditablePane, Pane,
ScrollingMixin, EditingMixin, object))
def test_mro_disagreement(self):
# Testing error messages for MRO disagreement...
mro_err_msg = """Cannot create a consistent method resolution
order (MRO) for bases """
def raises(exc, expected, callable, *args):
try:
callable(*args)
except exc as msg:
# the exact msg is generally considered an impl detail
if support.check_impl_detail():
if not str(msg).startswith(expected):
self.fail("Message %r, expected %r" %
(str(msg), expected))
else:
self.fail("Expected %s" % exc)
class A(object): pass
class B(A): pass
class C(object): pass
# Test some very simple errors
raises(TypeError, "duplicate base class A",
type, "X", (A, A), {})
raises(TypeError, mro_err_msg,
type, "X", (A, B), {})
raises(TypeError, mro_err_msg,
type, "X", (A, C, B), {})
# Test a slightly more complex error
class GridLayout(object): pass
class HorizontalGrid(GridLayout): pass
class VerticalGrid(GridLayout): pass
class HVGrid(HorizontalGrid, VerticalGrid): pass
class VHGrid(VerticalGrid, HorizontalGrid): pass
raises(TypeError, mro_err_msg,
type, "ConfusedGrid", (HVGrid, VHGrid), {})
def test_object_class(self):
# Testing object class...
a = object()
self.assertEqual(a.__class__, object)
self.assertEqual(type(a), object)
b = object()
self.assertNotEqual(a, b)
self.assertNotHasAttr(a, "foo")
try:
a.foo = 12
except (AttributeError, TypeError):
pass
else:
self.fail("object() should not allow setting a foo attribute")
self.assertNotHasAttr(object(), "__dict__")
class Cdict(object):
pass
x = Cdict()
self.assertEqual(x.__dict__, {})
x.foo = 1
self.assertEqual(x.foo, 1)
self.assertEqual(x.__dict__, {'foo': 1})
def test_object_class_assignment_between_heaptypes_and_nonheaptypes(self):
class SubType(types.ModuleType):
a = 1
m = types.ModuleType("m")
self.assertTrue(m.__class__ is types.ModuleType)
self.assertFalse(hasattr(m, "a"))
m.__class__ = SubType
self.assertTrue(m.__class__ is SubType)
self.assertTrue(hasattr(m, "a"))
m.__class__ = types.ModuleType
self.assertTrue(m.__class__ is types.ModuleType)
self.assertFalse(hasattr(m, "a"))
def test_slots(self):
# Testing __slots__...
class C0(object):
__slots__ = []
x = C0()
self.assertNotHasAttr(x, "__dict__")
self.assertNotHasAttr(x, "foo")
class C1(object):
__slots__ = ['a']
x = C1()
self.assertNotHasAttr(x, "__dict__")
self.assertNotHasAttr(x, "a")
x.a = 1
self.assertEqual(x.a, 1)
x.a = None
self.assertEqual(x.a, None)
del x.a
self.assertNotHasAttr(x, "a")
class C3(object):
__slots__ = ['a', 'b', 'c']
x = C3()
self.assertNotHasAttr(x, "__dict__")
self.assertNotHasAttr(x, 'a')
self.assertNotHasAttr(x, 'b')
self.assertNotHasAttr(x, 'c')
x.a = 1
x.b = 2
x.c = 3
self.assertEqual(x.a, 1)
self.assertEqual(x.b, 2)
self.assertEqual(x.c, 3)
class C4(object):
"""Validate name mangling"""
__slots__ = ['__a']
def __init__(self, value):
self.__a = value
def get(self):
return self.__a
x = C4(5)
self.assertNotHasAttr(x, '__dict__')
self.assertNotHasAttr(x, '__a')
self.assertEqual(x.get(), 5)
try:
x.__a = 6
except AttributeError:
pass
else:
self.fail("Double underscored names not mangled")
# Make sure slot names are proper identifiers
try:
class C(object):
__slots__ = [None]
except TypeError:
pass
else:
self.fail("[None] slots not caught")
try:
class C(object):
__slots__ = ["foo bar"]
except TypeError:
pass
else:
self.fail("['foo bar'] slots not caught")
try:
class C(object):
__slots__ = ["foo\0bar"]
except TypeError:
pass
else:
self.fail("['foo\\0bar'] slots not caught")
try:
class C(object):
__slots__ = ["1"]
except TypeError:
pass
else:
self.fail("['1'] slots not caught")
try:
class C(object):
__slots__ = [""]
except TypeError:
pass
else:
self.fail("[''] slots not caught")
class C(object):
__slots__ = ["a", "a_b", "_a", "A0123456789Z"]
# XXX(nnorwitz): was there supposed to be something tested
# from the class above?
# Test a single string is not expanded as a sequence.
class C(object):
__slots__ = "abc"
c = C()
c.abc = 5
self.assertEqual(c.abc, 5)
# Test unicode slot names
# Test a single unicode string is not expanded as a sequence.
class C(object):
__slots__ = "abc"
c = C()
c.abc = 5
self.assertEqual(c.abc, 5)
# _unicode_to_string used to modify slots in certain circumstances
slots = ("foo", "bar")
class C(object):
__slots__ = slots
x = C()
x.foo = 5
self.assertEqual(x.foo, 5)
self.assertIs(type(slots[0]), str)
# this used to leak references
try:
class C(object):
__slots__ = [chr(128)]
except (TypeError, UnicodeEncodeError):
pass
else:
self.fail("[chr(128)] slots not caught")
# Test leaks
class Counted(object):
counter = 0 # counts the number of instances alive
def __init__(self):
Counted.counter += 1
def __del__(self):
Counted.counter -= 1
class C(object):
__slots__ = ['a', 'b', 'c']
x = C()
x.a = Counted()
x.b = Counted()
x.c = Counted()
self.assertEqual(Counted.counter, 3)
del x
support.gc_collect()
self.assertEqual(Counted.counter, 0)
class D(C):
pass
x = D()
x.a = Counted()
x.z = Counted()
self.assertEqual(Counted.counter, 2)
del x
support.gc_collect()
self.assertEqual(Counted.counter, 0)
class E(D):
__slots__ = ['e']
x = E()
x.a = Counted()
x.z = Counted()
x.e = Counted()
self.assertEqual(Counted.counter, 3)
del x
support.gc_collect()
self.assertEqual(Counted.counter, 0)
# Test cyclical leaks [SF bug 519621]
class F(object):
__slots__ = ['a', 'b']
s = F()
s.a = [Counted(), s]
self.assertEqual(Counted.counter, 1)
s = None
support.gc_collect()
self.assertEqual(Counted.counter, 0)
# Test lookup leaks [SF bug 572567]
if hasattr(gc, 'get_objects'):
class G(object):
def __eq__(self, other):
return False
g = G()
orig_objects = len(gc.get_objects())
for i in range(10):
g==g
new_objects = len(gc.get_objects())
self.assertEqual(orig_objects, new_objects)
class H(object):
__slots__ = ['a', 'b']
def __init__(self):
self.a = 1
self.b = 2
def __del__(self_):
self.assertEqual(self_.a, 1)
self.assertEqual(self_.b, 2)
with support.captured_output('stderr') as s:
h = H()
del h
self.assertEqual(s.getvalue(), '')
class X(object):
__slots__ = "a"
with self.assertRaises(AttributeError):
del X().a
def test_slots_special(self):
# Testing __dict__ and __weakref__ in __slots__...
class D(object):
__slots__ = ["__dict__"]
a = D()
self.assertHasAttr(a, "__dict__")
self.assertNotHasAttr(a, "__weakref__")
a.foo = 42
self.assertEqual(a.__dict__, {"foo": 42})
class W(object):
__slots__ = ["__weakref__"]
a = W()
self.assertHasAttr(a, "__weakref__")
self.assertNotHasAttr(a, "__dict__")
try:
a.foo = 42
except AttributeError:
pass
else:
self.fail("shouldn't be allowed to set a.foo")
class C1(W, D):
__slots__ = []
a = C1()
self.assertHasAttr(a, "__dict__")
self.assertHasAttr(a, "__weakref__")
a.foo = 42
self.assertEqual(a.__dict__, {"foo": 42})
class C2(D, W):
__slots__ = []
a = C2()
self.assertHasAttr(a, "__dict__")
self.assertHasAttr(a, "__weakref__")
a.foo = 42
self.assertEqual(a.__dict__, {"foo": 42})
def test_slots_descriptor(self):
# Issue2115: slot descriptors did not correctly check
# the type of the given object
import abc
class MyABC(metaclass=abc.ABCMeta):
__slots__ = "a"
class Unrelated(object):
pass
MyABC.register(Unrelated)
u = Unrelated()
self.assertIsInstance(u, MyABC)
# This used to crash
self.assertRaises(TypeError, MyABC.a.__set__, u, 3)
def test_dynamics(self):
# Testing class attribute propagation...
class D(object):
pass
class E(D):
pass
class F(D):
pass
D.foo = 1
self.assertEqual(D.foo, 1)
# Test that dynamic attributes are inherited
self.assertEqual(E.foo, 1)
self.assertEqual(F.foo, 1)
# Test dynamic instances
class C(object):
pass
a = C()
self.assertNotHasAttr(a, "foobar")
C.foobar = 2
self.assertEqual(a.foobar, 2)
C.method = lambda self: 42
self.assertEqual(a.method(), 42)
C.__repr__ = lambda self: "C()"
self.assertEqual(repr(a), "C()")
C.__int__ = lambda self: 100
self.assertEqual(int(a), 100)
self.assertEqual(a.foobar, 2)
self.assertNotHasAttr(a, "spam")
def mygetattr(self, name):
if name == "spam":
return "spam"
raise AttributeError
C.__getattr__ = mygetattr
self.assertEqual(a.spam, "spam")
a.new = 12
self.assertEqual(a.new, 12)
def mysetattr(self, name, value):
if name == "spam":
raise AttributeError
return object.__setattr__(self, name, value)
C.__setattr__ = mysetattr
try:
a.spam = "not spam"
except AttributeError:
pass
else:
self.fail("expected AttributeError")
self.assertEqual(a.spam, "spam")
class D(C):
pass
d = D()
d.foo = 1
self.assertEqual(d.foo, 1)
# Test handling of int*seq and seq*int
class I(int):
pass
self.assertEqual("a"*I(2), "aa")
self.assertEqual(I(2)*"a", "aa")
self.assertEqual(2*I(3), 6)
self.assertEqual(I(3)*2, 6)
self.assertEqual(I(3)*I(2), 6)
# Test comparison of classes with dynamic metaclasses
class dynamicmetaclass(type):
pass
class someclass(metaclass=dynamicmetaclass):
pass
self.assertNotEqual(someclass, object)
def test_errors(self):
# Testing errors...
try:
class C(list, dict):
pass
except TypeError:
pass
else:
self.fail("inheritance from both list and dict should be illegal")
try:
class C(object, None):
pass
except TypeError:
pass
else:
self.fail("inheritance from non-type should be illegal")
class Classic:
pass
try:
class C(type(len)):
pass
except TypeError:
pass
else:
self.fail("inheritance from CFunction should be illegal")
try:
class C(object):
__slots__ = 1
except TypeError:
pass
else:
self.fail("__slots__ = 1 should be illegal")
try:
class C(object):
__slots__ = [1]
except TypeError:
pass
else:
self.fail("__slots__ = [1] should be illegal")
class M1(type):
pass
class M2(type):
pass
class A1(object, metaclass=M1):
pass
class A2(object, metaclass=M2):
pass
try:
class B(A1, A2):
pass
except TypeError:
pass
else:
self.fail("finding the most derived metaclass should have failed")
def test_classmethods(self):
# Testing class methods...
class C(object):
def foo(*a): return a
goo = classmethod(foo)
c = C()
self.assertEqual(C.goo(1), (C, 1))
self.assertEqual(c.goo(1), (C, 1))
self.assertEqual(c.foo(1), (c, 1))
class D(C):
pass
d = D()
self.assertEqual(D.goo(1), (D, 1))
self.assertEqual(d.goo(1), (D, 1))
self.assertEqual(d.foo(1), (d, 1))
self.assertEqual(D.foo(d, 1), (d, 1))
# Test for a specific crash (SF bug 528132)
def f(cls, arg): return (cls, arg)
ff = classmethod(f)
self.assertEqual(ff.__get__(0, int)(42), (int, 42))
self.assertEqual(ff.__get__(0)(42), (int, 42))
# Test super() with classmethods (SF bug 535444)
self.assertEqual(C.goo.__self__, C)
self.assertEqual(D.goo.__self__, D)
self.assertEqual(super(D,D).goo.__self__, D)
self.assertEqual(super(D,d).goo.__self__, D)
self.assertEqual(super(D,D).goo(), (D,))
self.assertEqual(super(D,d).goo(), (D,))
# Verify that a non-callable will raise
meth = classmethod(1).__get__(1)
self.assertRaises(TypeError, meth)
# Verify that classmethod() doesn't allow keyword args
try:
classmethod(f, kw=1)
except TypeError:
pass
else:
self.fail("classmethod shouldn't accept keyword args")
cm = classmethod(f)
self.assertEqual(cm.__dict__, {})
cm.x = 42
self.assertEqual(cm.x, 42)
self.assertEqual(cm.__dict__, {"x" : 42})
del cm.x
self.assertNotHasAttr(cm, "x")
@support.impl_detail("the module 'xxsubtype' is internal")
def test_classmethods_in_c(self):
# Testing C-based class methods...
import xxsubtype as spam
a = (1, 2, 3)
d = {'abc': 123}
x, a1, d1 = spam.spamlist.classmeth(*a, **d)
self.assertEqual(x, spam.spamlist)
self.assertEqual(a, a1)
self.assertEqual(d, d1)
x, a1, d1 = spam.spamlist().classmeth(*a, **d)
self.assertEqual(x, spam.spamlist)
self.assertEqual(a, a1)
self.assertEqual(d, d1)
spam_cm = spam.spamlist.__dict__['classmeth']
x2, a2, d2 = spam_cm(spam.spamlist, *a, **d)
self.assertEqual(x2, spam.spamlist)
self.assertEqual(a2, a1)
self.assertEqual(d2, d1)
class SubSpam(spam.spamlist): pass
x2, a2, d2 = spam_cm(SubSpam, *a, **d)
self.assertEqual(x2, SubSpam)
self.assertEqual(a2, a1)
self.assertEqual(d2, d1)
with self.assertRaises(TypeError):
spam_cm()
with self.assertRaises(TypeError):
spam_cm(spam.spamlist())
with self.assertRaises(TypeError):
spam_cm(list)
def test_staticmethods(self):
# Testing static methods...
class C(object):
def foo(*a): return a
goo = staticmethod(foo)
c = C()
self.assertEqual(C.goo(1), (1,))
self.assertEqual(c.goo(1), (1,))
self.assertEqual(c.foo(1), (c, 1,))
class D(C):
pass
d = D()
self.assertEqual(D.goo(1), (1,))
self.assertEqual(d.goo(1), (1,))
self.assertEqual(d.foo(1), (d, 1))
self.assertEqual(D.foo(d, 1), (d, 1))
sm = staticmethod(None)
self.assertEqual(sm.__dict__, {})
sm.x = 42
self.assertEqual(sm.x, 42)
self.assertEqual(sm.__dict__, {"x" : 42})
del sm.x
self.assertNotHasAttr(sm, "x")
@support.impl_detail("the module 'xxsubtype' is internal")
def test_staticmethods_in_c(self):
# Testing C-based static methods...
import xxsubtype as spam
a = (1, 2, 3)
d = {"abc": 123}
x, a1, d1 = spam.spamlist.staticmeth(*a, **d)
self.assertEqual(x, None)
self.assertEqual(a, a1)
self.assertEqual(d, d1)
x, a1, d2 = spam.spamlist().staticmeth(*a, **d)
self.assertEqual(x, None)
self.assertEqual(a, a1)
self.assertEqual(d, d1)
def test_classic(self):
# Testing classic classes...
class C:
def foo(*a): return a
goo = classmethod(foo)
c = C()
self.assertEqual(C.goo(1), (C, 1))
self.assertEqual(c.goo(1), (C, 1))
self.assertEqual(c.foo(1), (c, 1))
class D(C):
pass
d = D()
self.assertEqual(D.goo(1), (D, 1))
self.assertEqual(d.goo(1), (D, 1))
self.assertEqual(d.foo(1), (d, 1))
self.assertEqual(D.foo(d, 1), (d, 1))
class E: # *not* subclassing from C
foo = C.foo
self.assertEqual(E().foo.__func__, C.foo) # i.e., unbound
self.assertTrue(repr(C.foo.__get__(C())).startswith("<bound method "))
def test_compattr(self):
# Testing computed attributes...
class C(object):
class computed_attribute(object):
def __init__(self, get, set=None, delete=None):
self.__get = get
self.__set = set
self.__delete = delete
def __get__(self, obj, type=None):
return self.__get(obj)
def __set__(self, obj, value):
return self.__set(obj, value)
def __delete__(self, obj):
return self.__delete(obj)
def __init__(self):
self.__x = 0
def __get_x(self):
x = self.__x
self.__x = x+1
return x
def __set_x(self, x):
self.__x = x
def __delete_x(self):
del self.__x
x = computed_attribute(__get_x, __set_x, __delete_x)
a = C()
self.assertEqual(a.x, 0)
self.assertEqual(a.x, 1)
a.x = 10
self.assertEqual(a.x, 10)
self.assertEqual(a.x, 11)
del a.x
self.assertNotHasAttr(a, 'x')
def test_newslots(self):
# Testing __new__ slot override...
class C(list):
def __new__(cls):
self = list.__new__(cls)
self.foo = 1
return self
def __init__(self):
self.foo = self.foo + 2
a = C()
self.assertEqual(a.foo, 3)
self.assertEqual(a.__class__, C)
class D(C):
pass
b = D()
self.assertEqual(b.foo, 3)
self.assertEqual(b.__class__, D)
def test_altmro(self):
# Testing mro() and overriding it...
class A(object):
def f(self): return "A"
class B(A):
pass
class C(A):
def f(self): return "C"
class D(B, C):
pass
self.assertEqual(D.mro(), [D, B, C, A, object])
self.assertEqual(D.__mro__, (D, B, C, A, object))
self.assertEqual(D().f(), "C")
class PerverseMetaType(type):
def mro(cls):
L = type.mro(cls)
L.reverse()
return L
class X(D,B,C,A, metaclass=PerverseMetaType):
pass
self.assertEqual(X.__mro__, (object, A, C, B, D, X))
self.assertEqual(X().f(), "A")
try:
class _metaclass(type):
def mro(self):
return [self, dict, object]
class X(object, metaclass=_metaclass):
pass
# In CPython, the class creation above already raises
# TypeError, as a protection against the fact that
# instances of X would segfault it. In other Python
# implementations it would be ok to let the class X
# be created, but instead get a clean TypeError on the
# __setitem__ below.
x = object.__new__(X)
x[5] = 6
except TypeError:
pass
else:
self.fail("devious mro() return not caught")
try:
class _metaclass(type):
def mro(self):
return [1]
class X(object, metaclass=_metaclass):
pass
except TypeError:
pass
else:
self.fail("non-class mro() return not caught")
try:
class _metaclass(type):
def mro(self):
return 1
class X(object, metaclass=_metaclass):
pass
except TypeError:
pass
else:
self.fail("non-sequence mro() return not caught")
def test_overloading(self):
# Testing operator overloading...
class B(object):
"Intermediate class because object doesn't have a __setattr__"
class C(B):
def __getattr__(self, name):
if name == "foo":
return ("getattr", name)
else:
raise AttributeError
def __setattr__(self, name, value):
if name == "foo":
self.setattr = (name, value)
else:
return B.__setattr__(self, name, value)
def __delattr__(self, name):
if name == "foo":
self.delattr = name
else:
return B.__delattr__(self, name)
def __getitem__(self, key):
return ("getitem", key)
def __setitem__(self, key, value):
self.setitem = (key, value)
def __delitem__(self, key):
self.delitem = key
a = C()
self.assertEqual(a.foo, ("getattr", "foo"))
a.foo = 12
self.assertEqual(a.setattr, ("foo", 12))
del a.foo
self.assertEqual(a.delattr, "foo")
self.assertEqual(a[12], ("getitem", 12))
a[12] = 21
self.assertEqual(a.setitem, (12, 21))
del a[12]
self.assertEqual(a.delitem, 12)
self.assertEqual(a[0:10], ("getitem", slice(0, 10)))
a[0:10] = "foo"
self.assertEqual(a.setitem, (slice(0, 10), "foo"))
del a[0:10]
self.assertEqual(a.delitem, (slice(0, 10)))
def test_methods(self):
# Testing methods...
class C(object):
def __init__(self, x):
self.x = x
def foo(self):
return self.x
c1 = C(1)
self.assertEqual(c1.foo(), 1)
class D(C):
boo = C.foo
goo = c1.foo
d2 = D(2)
self.assertEqual(d2.foo(), 2)
self.assertEqual(d2.boo(), 2)
self.assertEqual(d2.goo(), 1)
class E(object):
foo = C.foo
self.assertEqual(E().foo.__func__, C.foo) # i.e., unbound
self.assertTrue(repr(C.foo.__get__(C(1))).startswith("<bound method "))
def test_special_method_lookup(self):
# The lookup of special methods bypasses __getattr__ and
# __getattribute__, but they still can be descriptors.
def run_context(manager):
with manager:
pass
def iden(self):
return self
def hello(self):
return b"hello"
def empty_seq(self):
return []
def zero(self):
return 0
def complex_num(self):
return 1j
def stop(self):
raise StopIteration
def return_true(self, thing=None):
return True
def do_isinstance(obj):
return isinstance(int, obj)
def do_issubclass(obj):
return issubclass(int, obj)
def do_dict_missing(checker):
class DictSub(checker.__class__, dict):
pass
self.assertEqual(DictSub()["hi"], 4)
def some_number(self_, key):
self.assertEqual(key, "hi")
return 4
def swallow(*args): pass
def format_impl(self, spec):
return "hello"
# It would be nice to have every special method tested here, but I'm
# only listing the ones I can remember outside of typeobject.c, since it
# does it right.
specials = [
("__bytes__", bytes, hello, set(), {}),
("__reversed__", reversed, empty_seq, set(), {}),
("__length_hint__", list, zero, set(),
{"__iter__" : iden, "__next__" : stop}),
("__sizeof__", sys.getsizeof, zero, set(), {}),
("__instancecheck__", do_isinstance, return_true, set(), {}),
("__missing__", do_dict_missing, some_number,
set(("__class__",)), {}),
("__subclasscheck__", do_issubclass, return_true,
set(("__bases__",)), {}),
("__enter__", run_context, iden, set(), {"__exit__" : swallow}),
("__exit__", run_context, swallow, set(), {"__enter__" : iden}),
("__complex__", complex, complex_num, set(), {}),
("__format__", format, format_impl, set(), {}),
("__floor__", math.floor, zero, set(), {}),
("__trunc__", math.trunc, zero, set(), {}),
("__trunc__", int, zero, set(), {}),
("__ceil__", math.ceil, zero, set(), {}),
("__dir__", dir, empty_seq, set(), {}),
("__round__", round, zero, set(), {}),
]
class Checker(object):
def __getattr__(self, attr, test=self):
test.fail("__getattr__ called with {0}".format(attr))
def __getattribute__(self, attr, test=self):
if attr not in ok:
test.fail("__getattribute__ called with {0}".format(attr))
return object.__getattribute__(self, attr)
class SpecialDescr(object):
def __init__(self, impl):
self.impl = impl
def __get__(self, obj, owner):
record.append(1)
return self.impl.__get__(obj, owner)
class MyException(Exception):
pass
class ErrDescr(object):
def __get__(self, obj, owner):
raise MyException
for name, runner, meth_impl, ok, env in specials:
class X(Checker):
pass
for attr, obj in env.items():
setattr(X, attr, obj)
setattr(X, name, meth_impl)
runner(X())
record = []
class X(Checker):
pass
for attr, obj in env.items():
setattr(X, attr, obj)
setattr(X, name, SpecialDescr(meth_impl))
runner(X())
self.assertEqual(record, [1], name)
class X(Checker):
pass
for attr, obj in env.items():
setattr(X, attr, obj)
setattr(X, name, ErrDescr())
self.assertRaises(MyException, runner, X())
def test_specials(self):
# Testing special operators...
# Test operators like __hash__ for which a built-in default exists
# Test the default behavior for static classes
class C(object):
def __getitem__(self, i):
if 0 <= i < 10: return i
raise IndexError
c1 = C()
c2 = C()
self.assertFalse(not c1)
self.assertNotEqual(id(c1), id(c2))
hash(c1)
hash(c2)
self.assertEqual(c1, c1)
self.assertTrue(c1 != c2)
self.assertFalse(c1 != c1)
self.assertFalse(c1 == c2)
# Note that the module name appears in str/repr, and that varies
# depending on whether this test is run standalone or from a framework.
self.assertGreaterEqual(str(c1).find('C object at '), 0)
self.assertEqual(str(c1), repr(c1))
self.assertNotIn(-1, c1)
for i in range(10):
self.assertIn(i, c1)
self.assertNotIn(10, c1)
# Test the default behavior for dynamic classes
class D(object):
def __getitem__(self, i):
if 0 <= i < 10: return i
raise IndexError
d1 = D()
d2 = D()
self.assertFalse(not d1)
self.assertNotEqual(id(d1), id(d2))
hash(d1)
hash(d2)
self.assertEqual(d1, d1)
self.assertNotEqual(d1, d2)
self.assertFalse(d1 != d1)
self.assertFalse(d1 == d2)
# Note that the module name appears in str/repr, and that varies
# depending on whether this test is run standalone or from a framework.
self.assertGreaterEqual(str(d1).find('D object at '), 0)
self.assertEqual(str(d1), repr(d1))
self.assertNotIn(-1, d1)
for i in range(10):
self.assertIn(i, d1)
self.assertNotIn(10, d1)
# Test overridden behavior
class Proxy(object):
def __init__(self, x):
self.x = x
def __bool__(self):
return not not self.x
def __hash__(self):
return hash(self.x)
def __eq__(self, other):
return self.x == other
def __ne__(self, other):
return self.x != other
def __ge__(self, other):
return self.x >= other
def __gt__(self, other):
return self.x > other
def __le__(self, other):
return self.x <= other
def __lt__(self, other):
return self.x < other
def __str__(self):
return "Proxy:%s" % self.x
def __repr__(self):
return "Proxy(%r)" % self.x
def __contains__(self, value):
return value in self.x
p0 = Proxy(0)
p1 = Proxy(1)
p_1 = Proxy(-1)
self.assertFalse(p0)
self.assertFalse(not p1)
self.assertEqual(hash(p0), hash(0))
self.assertEqual(p0, p0)
self.assertNotEqual(p0, p1)
self.assertFalse(p0 != p0)
self.assertEqual(not p0, p1)
self.assertTrue(p0 < p1)
self.assertTrue(p0 <= p1)
self.assertTrue(p1 > p0)
self.assertTrue(p1 >= p0)
self.assertEqual(str(p0), "Proxy:0")
self.assertEqual(repr(p0), "Proxy(0)")
p10 = Proxy(range(10))
self.assertNotIn(-1, p10)
for i in range(10):
self.assertIn(i, p10)
self.assertNotIn(10, p10)
def test_weakrefs(self):
# Testing weak references...
import weakref
class C(object):
pass
c = C()
r = weakref.ref(c)
self.assertEqual(r(), c)
del c
support.gc_collect()
self.assertEqual(r(), None)
del r
class NoWeak(object):
__slots__ = ['foo']
no = NoWeak()
try:
weakref.ref(no)
except TypeError as msg:
self.assertIn("weak reference", str(msg))
else:
self.fail("weakref.ref(no) should be illegal")
class Weak(object):
__slots__ = ['foo', '__weakref__']
yes = Weak()
r = weakref.ref(yes)
self.assertEqual(r(), yes)
del yes
support.gc_collect()
self.assertEqual(r(), None)
del r
def test_properties(self):
# Testing property...
class C(object):
def getx(self):
return self.__x
def setx(self, value):
self.__x = value
def delx(self):
del self.__x
x = property(getx, setx, delx, doc="I'm the x property.")
a = C()
self.assertNotHasAttr(a, "x")
a.x = 42
self.assertEqual(a._C__x, 42)
self.assertEqual(a.x, 42)
del a.x
self.assertNotHasAttr(a, "x")
self.assertNotHasAttr(a, "_C__x")
C.x.__set__(a, 100)
self.assertEqual(C.x.__get__(a), 100)
C.x.__delete__(a)
self.assertNotHasAttr(a, "x")
raw = C.__dict__['x']
self.assertIsInstance(raw, property)
attrs = dir(raw)
self.assertIn("__doc__", attrs)
self.assertIn("fget", attrs)
self.assertIn("fset", attrs)
self.assertIn("fdel", attrs)
self.assertEqual(raw.__doc__, "I'm the x property.")
self.assertIs(raw.fget, C.__dict__['getx'])
self.assertIs(raw.fset, C.__dict__['setx'])
self.assertIs(raw.fdel, C.__dict__['delx'])
for attr in "fget", "fset", "fdel":
try:
setattr(raw, attr, 42)
except AttributeError as msg:
if str(msg).find('readonly') < 0:
self.fail("when setting readonly attr %r on a property, "
"got unexpected AttributeError msg %r" % (attr, str(msg)))
else:
self.fail("expected AttributeError from trying to set readonly %r "
"attr on a property" % attr)
raw.__doc__ = 42
self.assertEqual(raw.__doc__, 42)
class D(object):
__getitem__ = property(lambda s: 1/0)
d = D()
try:
for i in d:
str(i)
except ZeroDivisionError:
pass
else:
self.fail("expected ZeroDivisionError from bad property")
@unittest.skipIf(sys.flags.optimize >= 2,
"Docstrings are omitted with -O2 and above")
def test_properties_doc_attrib(self):
class E(object):
def getter(self):
"getter method"
return 0
def setter(self_, value):
"setter method"
pass
prop = property(getter)
self.assertEqual(prop.__doc__, "getter method")
prop2 = property(fset=setter)
self.assertEqual(prop2.__doc__, None)
@support.cpython_only
def test_testcapi_no_segfault(self):
# this segfaulted in 2.5b2
try:
import _testcapi
except ImportError:
pass
else:
class X(object):
p = property(_testcapi.test_with_docstring)
def test_properties_plus(self):
class C(object):
foo = property(doc="hello")
@foo.getter
def foo(self):
return self._foo
@foo.setter
def foo(self, value):
self._foo = abs(value)
@foo.deleter
def foo(self):
del self._foo
c = C()
self.assertEqual(C.foo.__doc__, "hello")
self.assertNotHasAttr(c, "foo")
c.foo = -42
self.assertHasAttr(c, '_foo')
self.assertEqual(c._foo, 42)
self.assertEqual(c.foo, 42)
del c.foo
self.assertNotHasAttr(c, '_foo')
self.assertNotHasAttr(c, "foo")
class D(C):
@C.foo.deleter
def foo(self):
try:
del self._foo
except AttributeError:
pass
d = D()
d.foo = 24
self.assertEqual(d.foo, 24)
del d.foo
del d.foo
class E(object):
@property
def foo(self):
return self._foo
@foo.setter
def foo(self, value):
raise RuntimeError
@foo.setter
def foo(self, value):
self._foo = abs(value)
@foo.deleter
def foo(self, value=None):
del self._foo
e = E()
e.foo = -42
self.assertEqual(e.foo, 42)
del e.foo
class F(E):
@E.foo.deleter
def foo(self):
del self._foo
@foo.setter
def foo(self, value):
self._foo = max(0, value)
f = F()
f.foo = -10
self.assertEqual(f.foo, 0)
del f.foo
def test_dict_constructors(self):
# Testing dict constructor ...
d = dict()
self.assertEqual(d, {})
d = dict({})
self.assertEqual(d, {})
d = dict({1: 2, 'a': 'b'})
self.assertEqual(d, {1: 2, 'a': 'b'})
self.assertEqual(d, dict(list(d.items())))
self.assertEqual(d, dict(iter(d.items())))
d = dict({'one':1, 'two':2})
self.assertEqual(d, dict(one=1, two=2))
self.assertEqual(d, dict(**d))
self.assertEqual(d, dict({"one": 1}, two=2))
self.assertEqual(d, dict([("two", 2)], one=1))
self.assertEqual(d, dict([("one", 100), ("two", 200)], **d))
self.assertEqual(d, dict(**d))
for badarg in 0, 0, 0j, "0", [0], (0,):
try:
dict(badarg)
except TypeError:
pass
except ValueError:
if badarg == "0":
# It's a sequence, and its elements are also sequences (gotta
# love strings <wink>), but they aren't of length 2, so this
# one seemed better as a ValueError than a TypeError.
pass
else:
self.fail("no TypeError from dict(%r)" % badarg)
else:
self.fail("no TypeError from dict(%r)" % badarg)
try:
dict({}, {})
except TypeError:
pass
else:
self.fail("no TypeError from dict({}, {})")
class Mapping:
# Lacks a .keys() method; will be added later.
dict = {1:2, 3:4, 'a':1j}
try:
dict(Mapping())
except TypeError:
pass
else:
self.fail("no TypeError from dict(incomplete mapping)")
Mapping.keys = lambda self: list(self.dict.keys())
Mapping.__getitem__ = lambda self, i: self.dict[i]
d = dict(Mapping())
self.assertEqual(d, Mapping.dict)
# Init from sequence of iterable objects, each producing a 2-sequence.
class AddressBookEntry:
def __init__(self, first, last):
self.first = first
self.last = last
def __iter__(self):
return iter([self.first, self.last])
d = dict([AddressBookEntry('Tim', 'Warsaw'),
AddressBookEntry('Barry', 'Peters'),
AddressBookEntry('Tim', 'Peters'),
AddressBookEntry('Barry', 'Warsaw')])
self.assertEqual(d, {'Barry': 'Warsaw', 'Tim': 'Peters'})
d = dict(zip(range(4), range(1, 5)))
self.assertEqual(d, dict([(i, i+1) for i in range(4)]))
# Bad sequence lengths.
for bad in [('tooshort',)], [('too', 'long', 'by 1')]:
try:
dict(bad)
except ValueError:
pass
else:
self.fail("no ValueError from dict(%r)" % bad)
def test_dir(self):
# Testing dir() ...
junk = 12
self.assertEqual(dir(), ['junk', 'self'])
del junk
# Just make sure these don't blow up!
for arg in 2, 2, 2j, 2e0, [2], "2", b"2", (2,), {2:2}, type, self.test_dir:
dir(arg)
# Test dir on new-style classes. Since these have object as a
# base class, a lot more gets sucked in.
def interesting(strings):
return [s for s in strings if not s.startswith('_')]
class C(object):
Cdata = 1
def Cmethod(self): pass
cstuff = ['Cdata', 'Cmethod']
self.assertEqual(interesting(dir(C)), cstuff)
c = C()
self.assertEqual(interesting(dir(c)), cstuff)
## self.assertIn('__self__', dir(C.Cmethod))
c.cdata = 2
c.cmethod = lambda self: 0
self.assertEqual(interesting(dir(c)), cstuff + ['cdata', 'cmethod'])
## self.assertIn('__self__', dir(c.Cmethod))
class A(C):
Adata = 1
def Amethod(self): pass
astuff = ['Adata', 'Amethod'] + cstuff
self.assertEqual(interesting(dir(A)), astuff)
## self.assertIn('__self__', dir(A.Amethod))
a = A()
self.assertEqual(interesting(dir(a)), astuff)
a.adata = 42
a.amethod = lambda self: 3
self.assertEqual(interesting(dir(a)), astuff + ['adata', 'amethod'])
## self.assertIn('__self__', dir(a.Amethod))
# Try a module subclass.
class M(type(sys)):
pass
minstance = M("m")
minstance.b = 2
minstance.a = 1
default_attributes = ['__name__', '__doc__', '__package__',
'__loader__', '__spec__']
names = [x for x in dir(minstance) if x not in default_attributes]
self.assertEqual(names, ['a', 'b'])
class M2(M):
def getdict(self):
return "Not a dict!"
__dict__ = property(getdict)
m2instance = M2("m2")
m2instance.b = 2
m2instance.a = 1
self.assertEqual(m2instance.__dict__, "Not a dict!")
try:
dir(m2instance)
except TypeError:
pass
# Two essentially featureless objects, just inheriting stuff from
# object.
self.assertEqual(dir(NotImplemented), dir(Ellipsis))
# Nasty test case for proxied objects
class Wrapper(object):
def __init__(self, obj):
self.__obj = obj
def __repr__(self):
return "Wrapper(%s)" % repr(self.__obj)
def __getitem__(self, key):
return Wrapper(self.__obj[key])
def __len__(self):
return len(self.__obj)
def __getattr__(self, name):
return Wrapper(getattr(self.__obj, name))
class C(object):
def __getclass(self):
return Wrapper(type(self))
__class__ = property(__getclass)
dir(C()) # This used to segfault
def test_supers(self):
# Testing super...
class A(object):
def meth(self, a):
return "A(%r)" % a
self.assertEqual(A().meth(1), "A(1)")
class B(A):
def __init__(self):
self.__super = super(B, self)
def meth(self, a):
return "B(%r)" % a + self.__super.meth(a)
self.assertEqual(B().meth(2), "B(2)A(2)")
class C(A):
def meth(self, a):
return "C(%r)" % a + self.__super.meth(a)
C._C__super = super(C)
self.assertEqual(C().meth(3), "C(3)A(3)")
class D(C, B):
def meth(self, a):
return "D(%r)" % a + super(D, self).meth(a)
self.assertEqual(D().meth(4), "D(4)C(4)B(4)A(4)")
# Test for subclassing super
class mysuper(super):
def __init__(self, *args):
return super(mysuper, self).__init__(*args)
class E(D):
def meth(self, a):
return "E(%r)" % a + mysuper(E, self).meth(a)
self.assertEqual(E().meth(5), "E(5)D(5)C(5)B(5)A(5)")
class F(E):
def meth(self, a):
s = self.__super # == mysuper(F, self)
return "F(%r)[%s]" % (a, s.__class__.__name__) + s.meth(a)
F._F__super = mysuper(F)
self.assertEqual(F().meth(6), "F(6)[mysuper]E(6)D(6)C(6)B(6)A(6)")
# Make sure certain errors are raised
try:
super(D, 42)
except TypeError:
pass
else:
self.fail("shouldn't allow super(D, 42)")
try:
super(D, C())
except TypeError:
pass
else:
self.fail("shouldn't allow super(D, C())")
try:
super(D).__get__(12)
except TypeError:
pass
else:
self.fail("shouldn't allow super(D).__get__(12)")
try:
super(D).__get__(C())
except TypeError:
pass
else:
self.fail("shouldn't allow super(D).__get__(C())")
# Make sure data descriptors can be overridden and accessed via super
# (new feature in Python 2.3)
class DDbase(object):
def getx(self): return 42
x = property(getx)
class DDsub(DDbase):
def getx(self): return "hello"
x = property(getx)
dd = DDsub()
self.assertEqual(dd.x, "hello")
self.assertEqual(super(DDsub, dd).x, 42)
# Ensure that super() lookup of descriptor from classmethod
# works (SF ID# 743627)
class Base(object):
aProp = property(lambda self: "foo")
class Sub(Base):
@classmethod
def test(klass):
return super(Sub,klass).aProp
self.assertEqual(Sub.test(), Base.aProp)
# Verify that super() doesn't allow keyword args
try:
super(Base, kw=1)
except TypeError:
pass
else:
self.assertEqual("super shouldn't accept keyword args")
def test_basic_inheritance(self):
# Testing inheritance from basic types...
class hexint(int):
def __repr__(self):
return hex(self)
def __add__(self, other):
return hexint(int.__add__(self, other))
# (Note that overriding __radd__ doesn't work,
# because the int type gets first dibs.)
self.assertEqual(repr(hexint(7) + 9), "0x10")
self.assertEqual(repr(hexint(1000) + 7), "0x3ef")
a = hexint(12345)
self.assertEqual(a, 12345)
self.assertEqual(int(a), 12345)
self.assertIs(int(a).__class__, int)
self.assertEqual(hash(a), hash(12345))
self.assertIs((+a).__class__, int)
self.assertIs((a >> 0).__class__, int)
self.assertIs((a << 0).__class__, int)
self.assertIs((hexint(0) << 12).__class__, int)
self.assertIs((hexint(0) >> 12).__class__, int)
class octlong(int):
__slots__ = []
def __str__(self):
return oct(self)
def __add__(self, other):
return self.__class__(super(octlong, self).__add__(other))
__radd__ = __add__
self.assertEqual(str(octlong(3) + 5), "0o10")
# (Note that overriding __radd__ here only seems to work
# because the example uses a short int left argument.)
self.assertEqual(str(5 + octlong(3000)), "0o5675")
a = octlong(12345)
self.assertEqual(a, 12345)
self.assertEqual(int(a), 12345)
self.assertEqual(hash(a), hash(12345))
self.assertIs(int(a).__class__, int)
self.assertIs((+a).__class__, int)
self.assertIs((-a).__class__, int)
self.assertIs((-octlong(0)).__class__, int)
self.assertIs((a >> 0).__class__, int)
self.assertIs((a << 0).__class__, int)
self.assertIs((a - 0).__class__, int)
self.assertIs((a * 1).__class__, int)
self.assertIs((a ** 1).__class__, int)
self.assertIs((a // 1).__class__, int)
self.assertIs((1 * a).__class__, int)
self.assertIs((a | 0).__class__, int)
self.assertIs((a ^ 0).__class__, int)
self.assertIs((a & -1).__class__, int)
self.assertIs((octlong(0) << 12).__class__, int)
self.assertIs((octlong(0) >> 12).__class__, int)
self.assertIs(abs(octlong(0)).__class__, int)
# Because octlong overrides __add__, we can't check the absence of +0
# optimizations using octlong.
class longclone(int):
pass
a = longclone(1)
self.assertIs((a + 0).__class__, int)
self.assertIs((0 + a).__class__, int)
# Check that negative clones don't segfault
a = longclone(-1)
self.assertEqual(a.__dict__, {})
self.assertEqual(int(a), -1) # self.assertTrue PyNumber_Long() copies the sign bit
class precfloat(float):
__slots__ = ['prec']
def __init__(self, value=0.0, prec=12):
self.prec = int(prec)
def __repr__(self):
return "%.*g" % (self.prec, self)
self.assertEqual(repr(precfloat(1.1)), "1.1")
a = precfloat(12345)
self.assertEqual(a, 12345.0)
self.assertEqual(float(a), 12345.0)
self.assertIs(float(a).__class__, float)
self.assertEqual(hash(a), hash(12345.0))
self.assertIs((+a).__class__, float)
class madcomplex(complex):
def __repr__(self):
return "%.17gj%+.17g" % (self.imag, self.real)
a = madcomplex(-3, 4)
self.assertEqual(repr(a), "4j-3")
base = complex(-3, 4)
self.assertEqual(base.__class__, complex)
self.assertEqual(a, base)
self.assertEqual(complex(a), base)
self.assertEqual(complex(a).__class__, complex)
a = madcomplex(a) # just trying another form of the constructor
self.assertEqual(repr(a), "4j-3")
self.assertEqual(a, base)
self.assertEqual(complex(a), base)
self.assertEqual(complex(a).__class__, complex)
self.assertEqual(hash(a), hash(base))
self.assertEqual((+a).__class__, complex)
self.assertEqual((a + 0).__class__, complex)
self.assertEqual(a + 0, base)
self.assertEqual((a - 0).__class__, complex)
self.assertEqual(a - 0, base)
self.assertEqual((a * 1).__class__, complex)
self.assertEqual(a * 1, base)
self.assertEqual((a / 1).__class__, complex)
self.assertEqual(a / 1, base)
class madtuple(tuple):
_rev = None
def rev(self):
if self._rev is not None:
return self._rev
L = list(self)
L.reverse()
self._rev = self.__class__(L)
return self._rev
a = madtuple((1,2,3,4,5,6,7,8,9,0))
self.assertEqual(a, (1,2,3,4,5,6,7,8,9,0))
self.assertEqual(a.rev(), madtuple((0,9,8,7,6,5,4,3,2,1)))
self.assertEqual(a.rev().rev(), madtuple((1,2,3,4,5,6,7,8,9,0)))
for i in range(512):
t = madtuple(range(i))
u = t.rev()
v = u.rev()
self.assertEqual(v, t)
a = madtuple((1,2,3,4,5))
self.assertEqual(tuple(a), (1,2,3,4,5))
self.assertIs(tuple(a).__class__, tuple)
self.assertEqual(hash(a), hash((1,2,3,4,5)))
self.assertIs(a[:].__class__, tuple)
self.assertIs((a * 1).__class__, tuple)
self.assertIs((a * 0).__class__, tuple)
self.assertIs((a + ()).__class__, tuple)
a = madtuple(())
self.assertEqual(tuple(a), ())
self.assertIs(tuple(a).__class__, tuple)
self.assertIs((a + a).__class__, tuple)
self.assertIs((a * 0).__class__, tuple)
self.assertIs((a * 1).__class__, tuple)
self.assertIs((a * 2).__class__, tuple)
self.assertIs(a[:].__class__, tuple)
class madstring(str):
_rev = None
def rev(self):
if self._rev is not None:
return self._rev
L = list(self)
L.reverse()
self._rev = self.__class__("".join(L))
return self._rev
s = madstring("abcdefghijklmnopqrstuvwxyz")
self.assertEqual(s, "abcdefghijklmnopqrstuvwxyz")
self.assertEqual(s.rev(), madstring("zyxwvutsrqponmlkjihgfedcba"))
self.assertEqual(s.rev().rev(), madstring("abcdefghijklmnopqrstuvwxyz"))
for i in range(256):
s = madstring("".join(map(chr, range(i))))
t = s.rev()
u = t.rev()
self.assertEqual(u, s)
s = madstring("12345")
self.assertEqual(str(s), "12345")
self.assertIs(str(s).__class__, str)
base = "\x00" * 5
s = madstring(base)
self.assertEqual(s, base)
self.assertEqual(str(s), base)
self.assertIs(str(s).__class__, str)
self.assertEqual(hash(s), hash(base))
self.assertEqual({s: 1}[base], 1)
self.assertEqual({base: 1}[s], 1)
self.assertIs((s + "").__class__, str)
self.assertEqual(s + "", base)
self.assertIs(("" + s).__class__, str)
self.assertEqual("" + s, base)
self.assertIs((s * 0).__class__, str)
self.assertEqual(s * 0, "")
self.assertIs((s * 1).__class__, str)
self.assertEqual(s * 1, base)
self.assertIs((s * 2).__class__, str)
self.assertEqual(s * 2, base + base)
self.assertIs(s[:].__class__, str)
self.assertEqual(s[:], base)
self.assertIs(s[0:0].__class__, str)
self.assertEqual(s[0:0], "")
self.assertIs(s.strip().__class__, str)
self.assertEqual(s.strip(), base)
self.assertIs(s.lstrip().__class__, str)
self.assertEqual(s.lstrip(), base)
self.assertIs(s.rstrip().__class__, str)
self.assertEqual(s.rstrip(), base)
identitytab = {}
self.assertIs(s.translate(identitytab).__class__, str)
self.assertEqual(s.translate(identitytab), base)
self.assertIs(s.replace("x", "x").__class__, str)
self.assertEqual(s.replace("x", "x"), base)
self.assertIs(s.ljust(len(s)).__class__, str)
self.assertEqual(s.ljust(len(s)), base)
self.assertIs(s.rjust(len(s)).__class__, str)
self.assertEqual(s.rjust(len(s)), base)
self.assertIs(s.center(len(s)).__class__, str)
self.assertEqual(s.center(len(s)), base)
self.assertIs(s.lower().__class__, str)
self.assertEqual(s.lower(), base)
class madunicode(str):
_rev = None
def rev(self):
if self._rev is not None:
return self._rev
L = list(self)
L.reverse()
self._rev = self.__class__("".join(L))
return self._rev
u = madunicode("ABCDEF")
self.assertEqual(u, "ABCDEF")
self.assertEqual(u.rev(), madunicode("FEDCBA"))
self.assertEqual(u.rev().rev(), madunicode("ABCDEF"))
base = "12345"
u = madunicode(base)
self.assertEqual(str(u), base)
self.assertIs(str(u).__class__, str)
self.assertEqual(hash(u), hash(base))
self.assertEqual({u: 1}[base], 1)
self.assertEqual({base: 1}[u], 1)
self.assertIs(u.strip().__class__, str)
self.assertEqual(u.strip(), base)
self.assertIs(u.lstrip().__class__, str)
self.assertEqual(u.lstrip(), base)
self.assertIs(u.rstrip().__class__, str)
self.assertEqual(u.rstrip(), base)
self.assertIs(u.replace("x", "x").__class__, str)
self.assertEqual(u.replace("x", "x"), base)
self.assertIs(u.replace("xy", "xy").__class__, str)
self.assertEqual(u.replace("xy", "xy"), base)
self.assertIs(u.center(len(u)).__class__, str)
self.assertEqual(u.center(len(u)), base)
self.assertIs(u.ljust(len(u)).__class__, str)
self.assertEqual(u.ljust(len(u)), base)
self.assertIs(u.rjust(len(u)).__class__, str)
self.assertEqual(u.rjust(len(u)), base)
self.assertIs(u.lower().__class__, str)
self.assertEqual(u.lower(), base)
self.assertIs(u.upper().__class__, str)
self.assertEqual(u.upper(), base)
self.assertIs(u.capitalize().__class__, str)
self.assertEqual(u.capitalize(), base)
self.assertIs(u.title().__class__, str)
self.assertEqual(u.title(), base)
self.assertIs((u + "").__class__, str)
self.assertEqual(u + "", base)
self.assertIs(("" + u).__class__, str)
self.assertEqual("" + u, base)
self.assertIs((u * 0).__class__, str)
self.assertEqual(u * 0, "")
self.assertIs((u * 1).__class__, str)
self.assertEqual(u * 1, base)
self.assertIs((u * 2).__class__, str)
self.assertEqual(u * 2, base + base)
self.assertIs(u[:].__class__, str)
self.assertEqual(u[:], base)
self.assertIs(u[0:0].__class__, str)
self.assertEqual(u[0:0], "")
class sublist(list):
pass
a = sublist(range(5))
self.assertEqual(a, list(range(5)))
a.append("hello")
self.assertEqual(a, list(range(5)) + ["hello"])
a[5] = 5
self.assertEqual(a, list(range(6)))
a.extend(range(6, 20))
self.assertEqual(a, list(range(20)))
a[-5:] = []
self.assertEqual(a, list(range(15)))
del a[10:15]
self.assertEqual(len(a), 10)
self.assertEqual(a, list(range(10)))
self.assertEqual(list(a), list(range(10)))
self.assertEqual(a[0], 0)
self.assertEqual(a[9], 9)
self.assertEqual(a[-10], 0)
self.assertEqual(a[-1], 9)
self.assertEqual(a[:5], list(range(5)))
## class CountedInput(file):
## """Counts lines read by self.readline().
##
## self.lineno is the 0-based ordinal of the last line read, up to
## a maximum of one greater than the number of lines in the file.
##
## self.ateof is true if and only if the final "" line has been read,
## at which point self.lineno stops incrementing, and further calls
## to readline() continue to return "".
## """
##
## lineno = 0
## ateof = 0
## def readline(self):
## if self.ateof:
## return ""
## s = file.readline(self)
## # Next line works too.
## # s = super(CountedInput, self).readline()
## self.lineno += 1
## if s == "":
## self.ateof = 1
## return s
##
## f = file(name=support.TESTFN, mode='w')
## lines = ['a\n', 'b\n', 'c\n']
## try:
## f.writelines(lines)
## f.close()
## f = CountedInput(support.TESTFN)
## for (i, expected) in zip(range(1, 5) + [4], lines + 2 * [""]):
## got = f.readline()
## self.assertEqual(expected, got)
## self.assertEqual(f.lineno, i)
## self.assertEqual(f.ateof, (i > len(lines)))
## f.close()
## finally:
## try:
## f.close()
## except:
## pass
## support.unlink(support.TESTFN)
def test_keywords(self):
# Testing keyword args to basic type constructors ...
self.assertEqual(int(x=1), 1)
self.assertEqual(float(x=2), 2.0)
self.assertEqual(int(x=3), 3)
self.assertEqual(complex(imag=42, real=666), complex(666, 42))
self.assertEqual(str(object=500), '500')
self.assertEqual(str(object=b'abc', errors='strict'), 'abc')
self.assertEqual(tuple(sequence=range(3)), (0, 1, 2))
self.assertEqual(list(sequence=(0, 1, 2)), list(range(3)))
# note: as of Python 2.3, dict() no longer has an "items" keyword arg
for constructor in (int, float, int, complex, str, str,
tuple, list):
try:
constructor(bogus_keyword_arg=1)
except TypeError:
pass
else:
self.fail("expected TypeError from bogus keyword argument to %r"
% constructor)
def test_str_subclass_as_dict_key(self):
# Testing a str subclass used as dict key ..
class cistr(str):
"""Sublcass of str that computes __eq__ case-insensitively.
Also computes a hash code of the string in canonical form.
"""
def __init__(self, value):
self.canonical = value.lower()
self.hashcode = hash(self.canonical)
def __eq__(self, other):
if not isinstance(other, cistr):
other = cistr(other)
return self.canonical == other.canonical
def __hash__(self):
return self.hashcode
self.assertEqual(cistr('ABC'), 'abc')
self.assertEqual('aBc', cistr('ABC'))
self.assertEqual(str(cistr('ABC')), 'ABC')
d = {cistr('one'): 1, cistr('two'): 2, cistr('tHree'): 3}
self.assertEqual(d[cistr('one')], 1)
self.assertEqual(d[cistr('tWo')], 2)
self.assertEqual(d[cistr('THrEE')], 3)
self.assertIn(cistr('ONe'), d)
self.assertEqual(d.get(cistr('thrEE')), 3)
def test_classic_comparisons(self):
# Testing classic comparisons...
class classic:
pass
for base in (classic, int, object):
class C(base):
def __init__(self, value):
self.value = int(value)
def __eq__(self, other):
if isinstance(other, C):
return self.value == other.value
if isinstance(other, int) or isinstance(other, int):
return self.value == other
return NotImplemented
def __ne__(self, other):
if isinstance(other, C):
return self.value != other.value
if isinstance(other, int) or isinstance(other, int):
return self.value != other
return NotImplemented
def __lt__(self, other):
if isinstance(other, C):
return self.value < other.value
if isinstance(other, int) or isinstance(other, int):
return self.value < other
return NotImplemented
def __le__(self, other):
if isinstance(other, C):
return self.value <= other.value
if isinstance(other, int) or isinstance(other, int):
return self.value <= other
return NotImplemented
def __gt__(self, other):
if isinstance(other, C):
return self.value > other.value
if isinstance(other, int) or isinstance(other, int):
return self.value > other
return NotImplemented
def __ge__(self, other):
if isinstance(other, C):
return self.value >= other.value
if isinstance(other, int) or isinstance(other, int):
return self.value >= other
return NotImplemented
c1 = C(1)
c2 = C(2)
c3 = C(3)
self.assertEqual(c1, 1)
c = {1: c1, 2: c2, 3: c3}
for x in 1, 2, 3:
for y in 1, 2, 3:
for op in "<", "<=", "==", "!=", ">", ">=":
self.assertEqual(eval("c[x] %s c[y]" % op),
eval("x %s y" % op),
"x=%d, y=%d" % (x, y))
self.assertEqual(eval("c[x] %s y" % op),
eval("x %s y" % op),
"x=%d, y=%d" % (x, y))
self.assertEqual(eval("x %s c[y]" % op),
eval("x %s y" % op),
"x=%d, y=%d" % (x, y))
def test_rich_comparisons(self):
# Testing rich comparisons...
class Z(complex):
pass
z = Z(1)
self.assertEqual(z, 1+0j)
self.assertEqual(1+0j, z)
class ZZ(complex):
def __eq__(self, other):
try:
return abs(self - other) <= 1e-6
except:
return NotImplemented
zz = ZZ(1.0000003)
self.assertEqual(zz, 1+0j)
self.assertEqual(1+0j, zz)
class classic:
pass
for base in (classic, int, object, list):
class C(base):
def __init__(self, value):
self.value = int(value)
def __cmp__(self_, other):
self.fail("shouldn't call __cmp__")
def __eq__(self, other):
if isinstance(other, C):
return self.value == other.value
if isinstance(other, int) or isinstance(other, int):
return self.value == other
return NotImplemented
def __ne__(self, other):
if isinstance(other, C):
return self.value != other.value
if isinstance(other, int) or isinstance(other, int):
return self.value != other
return NotImplemented
def __lt__(self, other):
if isinstance(other, C):
return self.value < other.value
if isinstance(other, int) or isinstance(other, int):
return self.value < other
return NotImplemented
def __le__(self, other):
if isinstance(other, C):
return self.value <= other.value
if isinstance(other, int) or isinstance(other, int):
return self.value <= other
return NotImplemented
def __gt__(self, other):
if isinstance(other, C):
return self.value > other.value
if isinstance(other, int) or isinstance(other, int):
return self.value > other
return NotImplemented
def __ge__(self, other):
if isinstance(other, C):
return self.value >= other.value
if isinstance(other, int) or isinstance(other, int):
return self.value >= other
return NotImplemented
c1 = C(1)
c2 = C(2)
c3 = C(3)
self.assertEqual(c1, 1)
c = {1: c1, 2: c2, 3: c3}
for x in 1, 2, 3:
for y in 1, 2, 3:
for op in "<", "<=", "==", "!=", ">", ">=":
self.assertEqual(eval("c[x] %s c[y]" % op),
eval("x %s y" % op),
"x=%d, y=%d" % (x, y))
self.assertEqual(eval("c[x] %s y" % op),
eval("x %s y" % op),
"x=%d, y=%d" % (x, y))
self.assertEqual(eval("x %s c[y]" % op),
eval("x %s y" % op),
"x=%d, y=%d" % (x, y))
def test_descrdoc(self):
# Testing descriptor doc strings...
from _io import FileIO
def check(descr, what):
self.assertEqual(descr.__doc__, what)
check(FileIO.closed, "True if the file is closed") # getset descriptor
check(complex.real, "the real part of a complex number") # member descriptor
def test_doc_descriptor(self):
# Testing __doc__ descriptor...
# SF bug 542984
class DocDescr(object):
def __get__(self, object, otype):
if object:
object = object.__class__.__name__ + ' instance'
if otype:
otype = otype.__name__
return 'object=%s; type=%s' % (object, otype)
class OldClass:
__doc__ = DocDescr()
class NewClass(object):
__doc__ = DocDescr()
self.assertEqual(OldClass.__doc__, 'object=None; type=OldClass')
self.assertEqual(OldClass().__doc__, 'object=OldClass instance; type=OldClass')
self.assertEqual(NewClass.__doc__, 'object=None; type=NewClass')
self.assertEqual(NewClass().__doc__, 'object=NewClass instance; type=NewClass')
def test_set_class(self):
# Testing __class__ assignment...
class C(object): pass
class D(object): pass
class E(object): pass
class F(D, E): pass
for cls in C, D, E, F:
for cls2 in C, D, E, F:
x = cls()
x.__class__ = cls2
self.assertIs(x.__class__, cls2)
x.__class__ = cls
self.assertIs(x.__class__, cls)
def cant(x, C):
try:
x.__class__ = C
except TypeError:
pass
else:
self.fail("shouldn't allow %r.__class__ = %r" % (x, C))
try:
delattr(x, "__class__")
except (TypeError, AttributeError):
pass
else:
self.fail("shouldn't allow del %r.__class__" % x)
cant(C(), list)
cant(list(), C)
cant(C(), 1)
cant(C(), object)
cant(object(), list)
cant(list(), object)
class Int(int): __slots__ = []
cant(True, int)
cant(2, bool)
o = object()
cant(o, type(1))
cant(o, type(None))
del o
class G(object):
__slots__ = ["a", "b"]
class H(object):
__slots__ = ["b", "a"]
class I(object):
__slots__ = ["a", "b"]
class J(object):
__slots__ = ["c", "b"]
class K(object):
__slots__ = ["a", "b", "d"]
class L(H):
__slots__ = ["e"]
class M(I):
__slots__ = ["e"]
class N(J):
__slots__ = ["__weakref__"]
class P(J):
__slots__ = ["__dict__"]
class Q(J):
pass
class R(J):
__slots__ = ["__dict__", "__weakref__"]
for cls, cls2 in ((G, H), (G, I), (I, H), (Q, R), (R, Q)):
x = cls()
x.a = 1
x.__class__ = cls2
self.assertIs(x.__class__, cls2,
"assigning %r as __class__ for %r silently failed" % (cls2, x))
self.assertEqual(x.a, 1)
x.__class__ = cls
self.assertIs(x.__class__, cls,
"assigning %r as __class__ for %r silently failed" % (cls, x))
self.assertEqual(x.a, 1)
for cls in G, J, K, L, M, N, P, R, list, Int:
for cls2 in G, J, K, L, M, N, P, R, list, Int:
if cls is cls2:
continue
cant(cls(), cls2)
# Issue5283: when __class__ changes in __del__, the wrong
# type gets DECREF'd.
class O(object):
pass
class A(object):
def __del__(self):
self.__class__ = O
l = [A() for x in range(100)]
del l
def test_set_dict(self):
# Testing __dict__ assignment...
class C(object): pass
a = C()
a.__dict__ = {'b': 1}
self.assertEqual(a.b, 1)
def cant(x, dict):
try:
x.__dict__ = dict
except (AttributeError, TypeError):
pass
else:
self.fail("shouldn't allow %r.__dict__ = %r" % (x, dict))
cant(a, None)
cant(a, [])
cant(a, 1)
del a.__dict__ # Deleting __dict__ is allowed
class Base(object):
pass
def verify_dict_readonly(x):
"""
x has to be an instance of a class inheriting from Base.
"""
cant(x, {})
try:
del x.__dict__
except (AttributeError, TypeError):
pass
else:
self.fail("shouldn't allow del %r.__dict__" % x)
dict_descr = Base.__dict__["__dict__"]
try:
dict_descr.__set__(x, {})
except (AttributeError, TypeError):
pass
else:
self.fail("dict_descr allowed access to %r's dict" % x)
# Classes don't allow __dict__ assignment and have readonly dicts
class Meta1(type, Base):
pass
class Meta2(Base, type):
pass
class D(object, metaclass=Meta1):
pass
class E(object, metaclass=Meta2):
pass
for cls in C, D, E:
verify_dict_readonly(cls)
class_dict = cls.__dict__
try:
class_dict["spam"] = "eggs"
except TypeError:
pass
else:
self.fail("%r's __dict__ can be modified" % cls)
# Modules also disallow __dict__ assignment
class Module1(types.ModuleType, Base):
pass
class Module2(Base, types.ModuleType):
pass
for ModuleType in Module1, Module2:
mod = ModuleType("spam")
verify_dict_readonly(mod)
mod.__dict__["spam"] = "eggs"
# Exception's __dict__ can be replaced, but not deleted
# (at least not any more than regular exception's __dict__ can
# be deleted; on CPython it is not the case, whereas on PyPy they
# can, just like any other new-style instance's __dict__.)
def can_delete_dict(e):
try:
del e.__dict__
except (TypeError, AttributeError):
return False
else:
return True
class Exception1(Exception, Base):
pass
class Exception2(Base, Exception):
pass
for ExceptionType in Exception, Exception1, Exception2:
e = ExceptionType()
e.__dict__ = {"a": 1}
self.assertEqual(e.a, 1)
self.assertEqual(can_delete_dict(e), can_delete_dict(ValueError()))
def test_binary_operator_override(self):
# Testing overrides of binary operations...
class I(int):
def __repr__(self):
return "I(%r)" % int(self)
def __add__(self, other):
return I(int(self) + int(other))
__radd__ = __add__
def __pow__(self, other, mod=None):
if mod is None:
return I(pow(int(self), int(other)))
else:
return I(pow(int(self), int(other), int(mod)))
def __rpow__(self, other, mod=None):
if mod is None:
return I(pow(int(other), int(self), mod))
else:
return I(pow(int(other), int(self), int(mod)))
self.assertEqual(repr(I(1) + I(2)), "I(3)")
self.assertEqual(repr(I(1) + 2), "I(3)")
self.assertEqual(repr(1 + I(2)), "I(3)")
self.assertEqual(repr(I(2) ** I(3)), "I(8)")
self.assertEqual(repr(2 ** I(3)), "I(8)")
self.assertEqual(repr(I(2) ** 3), "I(8)")
self.assertEqual(repr(pow(I(2), I(3), I(5))), "I(3)")
class S(str):
def __eq__(self, other):
return self.lower() == other.lower()
def test_subclass_propagation(self):
# Testing propagation of slot functions to subclasses...
class A(object):
pass
class B(A):
pass
class C(A):
pass
class D(B, C):
pass
d = D()
orig_hash = hash(d) # related to id(d) in platform-dependent ways
A.__hash__ = lambda self: 42
self.assertEqual(hash(d), 42)
C.__hash__ = lambda self: 314
self.assertEqual(hash(d), 314)
B.__hash__ = lambda self: 144
self.assertEqual(hash(d), 144)
D.__hash__ = lambda self: 100
self.assertEqual(hash(d), 100)
D.__hash__ = None
self.assertRaises(TypeError, hash, d)
del D.__hash__
self.assertEqual(hash(d), 144)
B.__hash__ = None
self.assertRaises(TypeError, hash, d)
del B.__hash__
self.assertEqual(hash(d), 314)
C.__hash__ = None
self.assertRaises(TypeError, hash, d)
del C.__hash__
self.assertEqual(hash(d), 42)
A.__hash__ = None
self.assertRaises(TypeError, hash, d)
del A.__hash__
self.assertEqual(hash(d), orig_hash)
d.foo = 42
d.bar = 42
self.assertEqual(d.foo, 42)
self.assertEqual(d.bar, 42)
def __getattribute__(self, name):
if name == "foo":
return 24
return object.__getattribute__(self, name)
A.__getattribute__ = __getattribute__
self.assertEqual(d.foo, 24)
self.assertEqual(d.bar, 42)
def __getattr__(self, name):
if name in ("spam", "foo", "bar"):
return "hello"
raise AttributeError(name)
B.__getattr__ = __getattr__
self.assertEqual(d.spam, "hello")
self.assertEqual(d.foo, 24)
self.assertEqual(d.bar, 42)
del A.__getattribute__
self.assertEqual(d.foo, 42)
del d.foo
self.assertEqual(d.foo, "hello")
self.assertEqual(d.bar, 42)
del B.__getattr__
try:
d.foo
except AttributeError:
pass
else:
self.fail("d.foo should be undefined now")
# Test a nasty bug in recurse_down_subclasses()
class A(object):
pass
class B(A):
pass
del B
support.gc_collect()
A.__setitem__ = lambda *a: None # crash
def test_buffer_inheritance(self):
# Testing that buffer interface is inherited ...
import binascii
# SF bug [#470040] ParseTuple t# vs subclasses.
class MyBytes(bytes):
pass
base = b'abc'
m = MyBytes(base)
# b2a_hex uses the buffer interface to get its argument's value, via
# PyArg_ParseTuple 't#' code.
self.assertEqual(binascii.b2a_hex(m), binascii.b2a_hex(base))
class MyInt(int):
pass
m = MyInt(42)
try:
binascii.b2a_hex(m)
self.fail('subclass of int should not have a buffer interface')
except TypeError:
pass
def test_str_of_str_subclass(self):
# Testing __str__ defined in subclass of str ...
import binascii
import io
class octetstring(str):
def __str__(self):
return binascii.b2a_hex(self.encode('ascii')).decode("ascii")
def __repr__(self):
return self + " repr"
o = octetstring('A')
self.assertEqual(type(o), octetstring)
self.assertEqual(type(str(o)), str)
self.assertEqual(type(repr(o)), str)
self.assertEqual(ord(o), 0x41)
self.assertEqual(str(o), '41')
self.assertEqual(repr(o), 'A repr')
self.assertEqual(o.__str__(), '41')
self.assertEqual(o.__repr__(), 'A repr')
capture = io.StringIO()
# Calling str() or not exercises different internal paths.
print(o, file=capture)
print(str(o), file=capture)
self.assertEqual(capture.getvalue(), '41\n41\n')
capture.close()
def test_keyword_arguments(self):
# Testing keyword arguments to __init__, __call__...
def f(a): return a
self.assertEqual(f.__call__(a=42), 42)
a = []
list.__init__(a, sequence=[0, 1, 2])
self.assertEqual(a, [0, 1, 2])
def test_recursive_call(self):
# Testing recursive __call__() by setting to instance of class...
class A(object):
pass
A.__call__ = A()
try:
A()()
except RecursionError:
pass
else:
self.fail("Recursion limit should have been reached for __call__()")
def test_delete_hook(self):
# Testing __del__ hook...
log = []
class C(object):
def __del__(self):
log.append(1)
c = C()
self.assertEqual(log, [])
del c
support.gc_collect()
self.assertEqual(log, [1])
class D(object): pass
d = D()
try: del d[0]
except TypeError: pass
else: self.fail("invalid del() didn't raise TypeError")
def test_hash_inheritance(self):
# Testing hash of mutable subclasses...
class mydict(dict):
pass
d = mydict()
try:
hash(d)
except TypeError:
pass
else:
self.fail("hash() of dict subclass should fail")
class mylist(list):
pass
d = mylist()
try:
hash(d)
except TypeError:
pass
else:
self.fail("hash() of list subclass should fail")
def test_str_operations(self):
try: 'a' + 5
except TypeError: pass
else: self.fail("'' + 5 doesn't raise TypeError")
try: ''.split('')
except ValueError: pass
else: self.fail("''.split('') doesn't raise ValueError")
try: ''.join([0])
except TypeError: pass
else: self.fail("''.join([0]) doesn't raise TypeError")
try: ''.rindex('5')
except ValueError: pass
else: self.fail("''.rindex('5') doesn't raise ValueError")
try: '%(n)s' % None
except TypeError: pass
else: self.fail("'%(n)s' % None doesn't raise TypeError")
try: '%(n' % {}
except ValueError: pass
else: self.fail("'%(n' % {} '' doesn't raise ValueError")
try: '%*s' % ('abc')
except TypeError: pass
else: self.fail("'%*s' % ('abc') doesn't raise TypeError")
try: '%*.*s' % ('abc', 5)
except TypeError: pass
else: self.fail("'%*.*s' % ('abc', 5) doesn't raise TypeError")
try: '%s' % (1, 2)
except TypeError: pass
else: self.fail("'%s' % (1, 2) doesn't raise TypeError")
try: '%' % None
except ValueError: pass
else: self.fail("'%' % None doesn't raise ValueError")
self.assertEqual('534253'.isdigit(), 1)
self.assertEqual('534253x'.isdigit(), 0)
self.assertEqual('%c' % 5, '\x05')
self.assertEqual('%c' % '5', '5')
def test_deepcopy_recursive(self):
# Testing deepcopy of recursive objects...
class Node:
pass
a = Node()
b = Node()
a.b = b
b.a = a
z = deepcopy(a) # This blew up before
def test_unintialized_modules(self):
# Testing uninitialized module objects...
from types import ModuleType as M
m = M.__new__(M)
str(m)
self.assertNotHasAttr(m, "__name__")
self.assertNotHasAttr(m, "__file__")
self.assertNotHasAttr(m, "foo")
self.assertFalse(m.__dict__) # None or {} are both reasonable answers
m.foo = 1
self.assertEqual(m.__dict__, {"foo": 1})
def test_funny_new(self):
# Testing __new__ returning something unexpected...
class C(object):
def __new__(cls, arg):
if isinstance(arg, str): return [1, 2, 3]
elif isinstance(arg, int): return object.__new__(D)
else: return object.__new__(cls)
class D(C):
def __init__(self, arg):
self.foo = arg
self.assertEqual(C("1"), [1, 2, 3])
self.assertEqual(D("1"), [1, 2, 3])
d = D(None)
self.assertEqual(d.foo, None)
d = C(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
d = D(1)
self.assertIsInstance(d, D)
self.assertEqual(d.foo, 1)
def test_imul_bug(self):
# Testing for __imul__ problems...
# SF bug 544647
class C(object):
def __imul__(self, other):
return (self, other)
x = C()
y = x
y *= 1.0
self.assertEqual(y, (x, 1.0))
y = x
y *= 2
self.assertEqual(y, (x, 2))
y = x
y *= 3
self.assertEqual(y, (x, 3))
y = x
y *= 1<<100
self.assertEqual(y, (x, 1<<100))
y = x
y *= None
self.assertEqual(y, (x, None))
y = x
y *= "foo"
self.assertEqual(y, (x, "foo"))
def test_copy_setstate(self):
# Testing that copy.*copy() correctly uses __setstate__...
import copy
class C(object):
def __init__(self, foo=None):
self.foo = foo
self.__foo = foo
def setfoo(self, foo=None):
self.foo = foo
def getfoo(self):
return self.__foo
def __getstate__(self):
return [self.foo]
def __setstate__(self_, lst):
self.assertEqual(len(lst), 1)
self_.__foo = self_.foo = lst[0]
a = C(42)
a.setfoo(24)
self.assertEqual(a.foo, 24)
self.assertEqual(a.getfoo(), 42)
b = copy.copy(a)
self.assertEqual(b.foo, 24)
self.assertEqual(b.getfoo(), 24)
b = copy.deepcopy(a)
self.assertEqual(b.foo, 24)
self.assertEqual(b.getfoo(), 24)
def test_slices(self):
# Testing cases with slices and overridden __getitem__ ...
# Strings
self.assertEqual("hello"[:4], "hell")
self.assertEqual("hello"[slice(4)], "hell")
self.assertEqual(str.__getitem__("hello", slice(4)), "hell")
class S(str):
def __getitem__(self, x):
return str.__getitem__(self, x)
self.assertEqual(S("hello")[:4], "hell")
self.assertEqual(S("hello")[slice(4)], "hell")
self.assertEqual(S("hello").__getitem__(slice(4)), "hell")
# Tuples
self.assertEqual((1,2,3)[:2], (1,2))
self.assertEqual((1,2,3)[slice(2)], (1,2))
self.assertEqual(tuple.__getitem__((1,2,3), slice(2)), (1,2))
class T(tuple):
def __getitem__(self, x):
return tuple.__getitem__(self, x)
self.assertEqual(T((1,2,3))[:2], (1,2))
self.assertEqual(T((1,2,3))[slice(2)], (1,2))
self.assertEqual(T((1,2,3)).__getitem__(slice(2)), (1,2))
# Lists
self.assertEqual([1,2,3][:2], [1,2])
self.assertEqual([1,2,3][slice(2)], [1,2])
self.assertEqual(list.__getitem__([1,2,3], slice(2)), [1,2])
class L(list):
def __getitem__(self, x):
return list.__getitem__(self, x)
self.assertEqual(L([1,2,3])[:2], [1,2])
self.assertEqual(L([1,2,3])[slice(2)], [1,2])
self.assertEqual(L([1,2,3]).__getitem__(slice(2)), [1,2])
# Now do lists and __setitem__
a = L([1,2,3])
a[slice(1, 3)] = [3,2]
self.assertEqual(a, [1,3,2])
a[slice(0, 2, 1)] = [3,1]
self.assertEqual(a, [3,1,2])
a.__setitem__(slice(1, 3), [2,1])
self.assertEqual(a, [3,2,1])
a.__setitem__(slice(0, 2, 1), [2,3])
self.assertEqual(a, [2,3,1])
def test_subtype_resurrection(self):
# Testing resurrection of new-style instance...
class C(object):
container = []
def __del__(self):
# resurrect the instance
C.container.append(self)
c = C()
c.attr = 42
# The most interesting thing here is whether this blows up, due to
# flawed GC tracking logic in typeobject.c's call_finalizer() (a 2.2.1
# bug).
del c
support.gc_collect()
self.assertEqual(len(C.container), 1)
# Make c mortal again, so that the test framework with -l doesn't report
# it as a leak.
del C.__del__
def test_slots_trash(self):
# Testing slot trash...
# Deallocating deeply nested slotted trash caused stack overflows
class trash(object):
__slots__ = ['x']
def __init__(self, x):
self.x = x
o = None
for i in range(50000):
o = trash(o)
del o
def test_slots_multiple_inheritance(self):
# SF bug 575229, multiple inheritance w/ slots dumps core
class A(object):
__slots__=()
class B(object):
pass
class C(A,B) :
__slots__=()
if support.check_impl_detail():
self.assertEqual(C.__basicsize__, B.__basicsize__)
self.assertHasAttr(C, '__dict__')
self.assertHasAttr(C, '__weakref__')
C().x = 2
def test_rmul(self):
# Testing correct invocation of __rmul__...
# SF patch 592646
class C(object):
def __mul__(self, other):
return "mul"
def __rmul__(self, other):
return "rmul"
a = C()
self.assertEqual(a*2, "mul")
self.assertEqual(a*2.2, "mul")
self.assertEqual(2*a, "rmul")
self.assertEqual(2.2*a, "rmul")
def test_ipow(self):
# Testing correct invocation of __ipow__...
# [SF bug 620179]
class C(object):
def __ipow__(self, other):
pass
a = C()
a **= 2
def test_mutable_bases(self):
# Testing mutable bases...
# stuff that should work:
class C(object):
pass
class C2(object):
def __getattribute__(self, attr):
if attr == 'a':
return 2
else:
return super(C2, self).__getattribute__(attr)
def meth(self):
return 1
class D(C):
pass
class E(D):
pass
d = D()
e = E()
D.__bases__ = (C,)
D.__bases__ = (C2,)
self.assertEqual(d.meth(), 1)
self.assertEqual(e.meth(), 1)
self.assertEqual(d.a, 2)
self.assertEqual(e.a, 2)
self.assertEqual(C2.__subclasses__(), [D])
try:
del D.__bases__
except (TypeError, AttributeError):
pass
else:
self.fail("shouldn't be able to delete .__bases__")
try:
D.__bases__ = ()
except TypeError as msg:
if str(msg) == "a new-style class can't have only classic bases":
self.fail("wrong error message for .__bases__ = ()")
else:
self.fail("shouldn't be able to set .__bases__ to ()")
try:
D.__bases__ = (D,)
except TypeError:
pass
else:
# actually, we'll have crashed by here...
self.fail("shouldn't be able to create inheritance cycles")
try:
D.__bases__ = (C, C)
except TypeError:
pass
else:
self.fail("didn't detect repeated base classes")
try:
D.__bases__ = (E,)
except TypeError:
pass
else:
self.fail("shouldn't be able to create inheritance cycles")
def test_builtin_bases(self):
# Make sure all the builtin types can have their base queried without
# segfaulting. See issue #5787.
builtin_types = [tp for tp in builtins.__dict__.values()
if isinstance(tp, type)]
for tp in builtin_types:
object.__getattribute__(tp, "__bases__")
if tp is not object:
self.assertEqual(len(tp.__bases__), 1, tp)
class L(list):
pass
class C(object):
pass
class D(C):
pass
try:
L.__bases__ = (dict,)
except TypeError:
pass
else:
self.fail("shouldn't turn list subclass into dict subclass")
try:
list.__bases__ = (dict,)
except TypeError:
pass
else:
self.fail("shouldn't be able to assign to list.__bases__")
try:
D.__bases__ = (C, list)
except TypeError:
pass
else:
assert 0, "best_base calculation found wanting"
def test_mutable_bases_with_failing_mro(self):
# Testing mutable bases with failing mro...
class WorkOnce(type):
def __new__(self, name, bases, ns):
self.flag = 0
return super(WorkOnce, self).__new__(WorkOnce, name, bases, ns)
def mro(self):
if self.flag > 0:
raise RuntimeError("bozo")
else:
self.flag += 1
return type.mro(self)
class WorkAlways(type):
def mro(self):
# this is here to make sure that .mro()s aren't called
# with an exception set (which was possible at one point).
# An error message will be printed in a debug build.
# What's a good way to test for this?
return type.mro(self)
class C(object):
pass
class C2(object):
pass
class D(C):
pass
class E(D):
pass
class F(D, metaclass=WorkOnce):
pass
class G(D, metaclass=WorkAlways):
pass
# Immediate subclasses have their mro's adjusted in alphabetical
# order, so E's will get adjusted before adjusting F's fails. We
# check here that E's gets restored.
E_mro_before = E.__mro__
D_mro_before = D.__mro__
try:
D.__bases__ = (C2,)
except RuntimeError:
self.assertEqual(E.__mro__, E_mro_before)
self.assertEqual(D.__mro__, D_mro_before)
else:
self.fail("exception not propagated")
def test_mutable_bases_catch_mro_conflict(self):
# Testing mutable bases catch mro conflict...
class A(object):
pass
class B(object):
pass
class C(A, B):
pass
class D(A, B):
pass
class E(C, D):
pass
try:
C.__bases__ = (B, A)
except TypeError:
pass
else:
self.fail("didn't catch MRO conflict")
def test_mutable_names(self):
# Testing mutable names...
class C(object):
pass
# C.__module__ could be 'test_descr' or '__main__'
mod = C.__module__
C.__name__ = 'D'
self.assertEqual((C.__module__, C.__name__), (mod, 'D'))
C.__name__ = 'D.E'
self.assertEqual((C.__module__, C.__name__), (mod, 'D.E'))
def test_evil_type_name(self):
# A badly placed Py_DECREF in type_set_name led to arbitrary code
# execution while the type structure was not in a sane state, and a
# possible segmentation fault as a result. See bug #16447.
class Nasty(str):
def __del__(self):
C.__name__ = "other"
class C:
pass
C.__name__ = Nasty("abc")
C.__name__ = "normal"
def test_subclass_right_op(self):
# Testing correct dispatch of subclass overloading __r<op>__...
# This code tests various cases where right-dispatch of a subclass
# should be preferred over left-dispatch of a base class.
# Case 1: subclass of int; this tests code in abstract.c::binary_op1()
class B(int):
def __floordiv__(self, other):
return "B.__floordiv__"
def __rfloordiv__(self, other):
return "B.__rfloordiv__"
self.assertEqual(B(1) // 1, "B.__floordiv__")
self.assertEqual(1 // B(1), "B.__rfloordiv__")
# Case 2: subclass of object; this is just the baseline for case 3
class C(object):
def __floordiv__(self, other):
return "C.__floordiv__"
def __rfloordiv__(self, other):
return "C.__rfloordiv__"
self.assertEqual(C() // 1, "C.__floordiv__")
self.assertEqual(1 // C(), "C.__rfloordiv__")
# Case 3: subclass of new-style class; here it gets interesting
class D(C):
def __floordiv__(self, other):
return "D.__floordiv__"
def __rfloordiv__(self, other):
return "D.__rfloordiv__"
self.assertEqual(D() // C(), "D.__floordiv__")
self.assertEqual(C() // D(), "D.__rfloordiv__")
# Case 4: this didn't work right in 2.2.2 and 2.3a1
class E(C):
pass
self.assertEqual(E.__rfloordiv__, C.__rfloordiv__)
self.assertEqual(E() // 1, "C.__floordiv__")
self.assertEqual(1 // E(), "C.__rfloordiv__")
self.assertEqual(E() // C(), "C.__floordiv__")
self.assertEqual(C() // E(), "C.__floordiv__") # This one would fail
@support.impl_detail("testing an internal kind of method object")
def test_meth_class_get(self):
# Testing __get__ method of METH_CLASS C methods...
# Full coverage of descrobject.c::classmethod_get()
# Baseline
arg = [1, 2, 3]
res = {1: None, 2: None, 3: None}
self.assertEqual(dict.fromkeys(arg), res)
self.assertEqual({}.fromkeys(arg), res)
# Now get the descriptor
descr = dict.__dict__["fromkeys"]
# More baseline using the descriptor directly
self.assertEqual(descr.__get__(None, dict)(arg), res)
self.assertEqual(descr.__get__({})(arg), res)
# Now check various error cases
try:
descr.__get__(None, None)
except TypeError:
pass
else:
self.fail("shouldn't have allowed descr.__get__(None, None)")
try:
descr.__get__(42)
except TypeError:
pass
else:
self.fail("shouldn't have allowed descr.__get__(42)")
try:
descr.__get__(None, 42)
except TypeError:
pass
else:
self.fail("shouldn't have allowed descr.__get__(None, 42)")
try:
descr.__get__(None, int)
except TypeError:
pass
else:
self.fail("shouldn't have allowed descr.__get__(None, int)")
def test_isinst_isclass(self):
# Testing proxy isinstance() and isclass()...
class Proxy(object):
def __init__(self, obj):
self.__obj = obj
def __getattribute__(self, name):
if name.startswith("_Proxy__"):
return object.__getattribute__(self, name)
else:
return getattr(self.__obj, name)
# Test with a classic class
class C:
pass
a = C()
pa = Proxy(a)
self.assertIsInstance(a, C) # Baseline
self.assertIsInstance(pa, C) # Test
# Test with a classic subclass
class D(C):
pass
a = D()
pa = Proxy(a)
self.assertIsInstance(a, C) # Baseline
self.assertIsInstance(pa, C) # Test
# Test with a new-style class
class C(object):
pass
a = C()
pa = Proxy(a)
self.assertIsInstance(a, C) # Baseline
self.assertIsInstance(pa, C) # Test
# Test with a new-style subclass
class D(C):
pass
a = D()
pa = Proxy(a)
self.assertIsInstance(a, C) # Baseline
self.assertIsInstance(pa, C) # Test
def test_proxy_super(self):
# Testing super() for a proxy object...
class Proxy(object):
def __init__(self, obj):
self.__obj = obj
def __getattribute__(self, name):
if name.startswith("_Proxy__"):
return object.__getattribute__(self, name)
else:
return getattr(self.__obj, name)
class B(object):
def f(self):
return "B.f"
class C(B):
def f(self):
return super(C, self).f() + "->C.f"
obj = C()
p = Proxy(obj)
self.assertEqual(C.__dict__["f"](p), "B.f->C.f")
def test_carloverre(self):
# Testing prohibition of Carlo Verre's hack...
try:
object.__setattr__(str, "foo", 42)
except TypeError:
pass
else:
self.fail("Carlo Verre __setattr__ succeeded!")
try:
object.__delattr__(str, "lower")
except TypeError:
pass
else:
self.fail("Carlo Verre __delattr__ succeeded!")
def test_weakref_segfault(self):
# Testing weakref segfault...
# SF 742911
import weakref
class Provoker:
def __init__(self, referrent):
self.ref = weakref.ref(referrent)
def __del__(self):
x = self.ref()
class Oops(object):
pass
o = Oops()
o.whatever = Provoker(o)
del o
def test_wrapper_segfault(self):
# SF 927248: deeply nested wrappers could cause stack overflow
f = lambda:None
for i in range(1000000):
f = f.__call__
f = None
def test_file_fault(self):
# Testing sys.stdout is changed in getattr...
test_stdout = sys.stdout
class StdoutGuard:
def __getattr__(self, attr):
sys.stdout = sys.__stdout__
raise RuntimeError("Premature access to sys.stdout.%s" % attr)
sys.stdout = StdoutGuard()
try:
print("Oops!")
except RuntimeError:
pass
finally:
sys.stdout = test_stdout
def test_vicious_descriptor_nonsense(self):
# Testing vicious_descriptor_nonsense...
# A potential segfault spotted by Thomas Wouters in mail to
# python-dev 2003-04-17, turned into an example & fixed by Michael
# Hudson just less than four months later...
class Evil(object):
def __hash__(self):
return hash('attr')
def __eq__(self, other):
del C.attr
return 0
class Descr(object):
def __get__(self, ob, type=None):
return 1
class C(object):
attr = Descr()
c = C()
c.__dict__[Evil()] = 0
self.assertEqual(c.attr, 1)
# this makes a crash more likely:
support.gc_collect()
self.assertNotHasAttr(c, 'attr')
def test_init(self):
# SF 1155938
class Foo(object):
def __init__(self):
return 10
try:
Foo()
except TypeError:
pass
else:
self.fail("did not test __init__() for None return")
def test_method_wrapper(self):
# Testing method-wrapper objects...
# <type 'method-wrapper'> did not support any reflection before 2.5
# XXX should methods really support __eq__?
l = []
self.assertEqual(l.__add__, l.__add__)
self.assertEqual(l.__add__, [].__add__)
self.assertNotEqual(l.__add__, [5].__add__)
self.assertNotEqual(l.__add__, l.__mul__)
self.assertEqual(l.__add__.__name__, '__add__')
if hasattr(l.__add__, '__self__'):
# CPython
self.assertIs(l.__add__.__self__, l)
self.assertIs(l.__add__.__objclass__, list)
else:
# Python implementations where [].__add__ is a normal bound method
self.assertIs(l.__add__.im_self, l)
self.assertIs(l.__add__.im_class, list)
self.assertEqual(l.__add__.__doc__, list.__add__.__doc__)
try:
hash(l.__add__)
except TypeError:
pass
else:
self.fail("no TypeError from hash([].__add__)")
t = ()
t += (7,)
self.assertEqual(t.__add__, (7,).__add__)
self.assertEqual(hash(t.__add__), hash((7,).__add__))
def test_not_implemented(self):
# Testing NotImplemented...
# all binary methods should be able to return a NotImplemented
import operator
def specialmethod(self, other):
return NotImplemented
def check(expr, x, y):
try:
exec(expr, {'x': x, 'y': y, 'operator': operator})
except TypeError:
pass
else:
self.fail("no TypeError from %r" % (expr,))
N1 = sys.maxsize + 1 # might trigger OverflowErrors instead of
# TypeErrors
N2 = sys.maxsize # if sizeof(int) < sizeof(long), might trigger
# ValueErrors instead of TypeErrors
for name, expr, iexpr in [
('__add__', 'x + y', 'x += y'),
('__sub__', 'x - y', 'x -= y'),
('__mul__', 'x * y', 'x *= y'),
('__matmul__', 'x @ y', 'x @= y'),
('__truediv__', 'x / y', 'x /= y'),
('__floordiv__', 'x // y', 'x //= y'),
('__mod__', 'x % y', 'x %= y'),
('__divmod__', 'divmod(x, y)', None),
('__pow__', 'x ** y', 'x **= y'),
('__lshift__', 'x << y', 'x <<= y'),
('__rshift__', 'x >> y', 'x >>= y'),
('__and__', 'x & y', 'x &= y'),
('__or__', 'x | y', 'x |= y'),
('__xor__', 'x ^ y', 'x ^= y')]:
rname = '__r' + name[2:]
A = type('A', (), {name: specialmethod})
a = A()
check(expr, a, a)
check(expr, a, N1)
check(expr, a, N2)
if iexpr:
check(iexpr, a, a)
check(iexpr, a, N1)
check(iexpr, a, N2)
iname = '__i' + name[2:]
C = type('C', (), {iname: specialmethod})
c = C()
check(iexpr, c, a)
check(iexpr, c, N1)
check(iexpr, c, N2)
def test_assign_slice(self):
# ceval.c's assign_slice used to check for
# tp->tp_as_sequence->sq_slice instead of
# tp->tp_as_sequence->sq_ass_slice
class C(object):
def __setitem__(self, idx, value):
self.value = value
c = C()
c[1:2] = 3
self.assertEqual(c.value, 3)
def test_set_and_no_get(self):
# See
# http://mail.python.org/pipermail/python-dev/2010-January/095637.html
class Descr(object):
def __init__(self, name):
self.name = name
def __set__(self, obj, value):
obj.__dict__[self.name] = value
descr = Descr("a")
class X(object):
a = descr
x = X()
self.assertIs(x.a, descr)
x.a = 42
self.assertEqual(x.a, 42)
# Also check type_getattro for correctness.
class Meta(type):
pass
class X(metaclass=Meta):
pass
X.a = 42
Meta.a = Descr("a")
self.assertEqual(X.a, 42)
def test_getattr_hooks(self):
# issue 4230
class Descriptor(object):
counter = 0
def __get__(self, obj, objtype=None):
def getter(name):
self.counter += 1
raise AttributeError(name)
return getter
descr = Descriptor()
class A(object):
__getattribute__ = descr
class B(object):
__getattr__ = descr
class C(object):
__getattribute__ = descr
__getattr__ = descr
self.assertRaises(AttributeError, getattr, A(), "attr")
self.assertEqual(descr.counter, 1)
self.assertRaises(AttributeError, getattr, B(), "attr")
self.assertEqual(descr.counter, 2)
self.assertRaises(AttributeError, getattr, C(), "attr")
self.assertEqual(descr.counter, 4)
class EvilGetattribute(object):
# This used to segfault
def __getattr__(self, name):
raise AttributeError(name)
def __getattribute__(self, name):
del EvilGetattribute.__getattr__
for i in range(5):
gc.collect()
raise AttributeError(name)
self.assertRaises(AttributeError, getattr, EvilGetattribute(), "attr")
def test_type___getattribute__(self):
self.assertRaises(TypeError, type.__getattribute__, list, type)
def test_abstractmethods(self):
# type pretends not to have __abstractmethods__.
self.assertRaises(AttributeError, getattr, type, "__abstractmethods__")
class meta(type):
pass
self.assertRaises(AttributeError, getattr, meta, "__abstractmethods__")
class X(object):
pass
with self.assertRaises(AttributeError):
del X.__abstractmethods__
def test_proxy_call(self):
class FakeStr:
__class__ = str
fake_str = FakeStr()
# isinstance() reads __class__
self.assertIsInstance(fake_str, str)
# call a method descriptor
with self.assertRaises(TypeError):
str.split(fake_str)
# call a slot wrapper descriptor
with self.assertRaises(TypeError):
str.__add__(fake_str, "abc")
def test_repr_as_str(self):
# Issue #11603: crash or infinite loop when rebinding __str__ as
# __repr__.
class Foo:
pass
Foo.__repr__ = Foo.__str__
foo = Foo()
self.assertRaises(RecursionError, str, foo)
self.assertRaises(RecursionError, repr, foo)
def test_mixing_slot_wrappers(self):
class X(dict):
__setattr__ = dict.__setitem__
x = X()
x.y = 42
self.assertEqual(x["y"], 42)
def test_slot_shadows_class_variable(self):
with self.assertRaises(ValueError) as cm:
class X:
__slots__ = ["foo"]
foo = None
m = str(cm.exception)
self.assertEqual("'foo' in __slots__ conflicts with class variable", m)
def test_set_doc(self):
class X:
"elephant"
X.__doc__ = "banana"
self.assertEqual(X.__doc__, "banana")
with self.assertRaises(TypeError) as cm:
type(list).__dict__["__doc__"].__set__(list, "blah")
self.assertIn("can't set list.__doc__", str(cm.exception))
with self.assertRaises(TypeError) as cm:
type(X).__dict__["__doc__"].__delete__(X)
self.assertIn("can't delete X.__doc__", str(cm.exception))
self.assertEqual(X.__doc__, "banana")
def test_qualname(self):
descriptors = [str.lower, complex.real, float.real, int.__add__]
types = ['method', 'member', 'getset', 'wrapper']
# make sure we have an example of each type of descriptor
for d, n in zip(descriptors, types):
self.assertEqual(type(d).__name__, n + '_descriptor')
for d in descriptors:
qualname = d.__objclass__.__qualname__ + '.' + d.__name__
self.assertEqual(d.__qualname__, qualname)
self.assertEqual(str.lower.__qualname__, 'str.lower')
self.assertEqual(complex.real.__qualname__, 'complex.real')
self.assertEqual(float.real.__qualname__, 'float.real')
self.assertEqual(int.__add__.__qualname__, 'int.__add__')
class X:
pass
with self.assertRaises(TypeError):
del X.__qualname__
self.assertRaises(TypeError, type.__dict__['__qualname__'].__set__,
str, 'Oink')
global Y
class Y:
class Inside:
pass
self.assertEqual(Y.__qualname__, 'Y')
self.assertEqual(Y.Inside.__qualname__, 'Y.Inside')
def test_qualname_dict(self):
ns = {'__qualname__': 'some.name'}
tp = type('Foo', (), ns)
self.assertEqual(tp.__qualname__, 'some.name')
self.assertNotIn('__qualname__', tp.__dict__)
self.assertEqual(ns, {'__qualname__': 'some.name'})
ns = {'__qualname__': 1}
self.assertRaises(TypeError, type, 'Foo', (), ns)
def test_cycle_through_dict(self):
# See bug #1469629
class X(dict):
def __init__(self):
dict.__init__(self)
self.__dict__ = self
x = X()
x.attr = 42
wr = weakref.ref(x)
del x
support.gc_collect()
self.assertIsNone(wr())
for o in gc.get_objects():
self.assertIsNot(type(o), X)
def test_object_new_and_init_with_parameters(self):
# See issue #1683368
class OverrideNeither:
pass
self.assertRaises(TypeError, OverrideNeither, 1)
self.assertRaises(TypeError, OverrideNeither, kw=1)
class OverrideNew:
def __new__(cls, foo, kw=0, *args, **kwds):
return object.__new__(cls, *args, **kwds)
class OverrideInit:
def __init__(self, foo, kw=0, *args, **kwargs):
return object.__init__(self, *args, **kwargs)
class OverrideBoth(OverrideNew, OverrideInit):
pass
for case in OverrideNew, OverrideInit, OverrideBoth:
case(1)
case(1, kw=2)
self.assertRaises(TypeError, case, 1, 2, 3)
self.assertRaises(TypeError, case, 1, 2, foo=3)
def test_subclassing_does_not_duplicate_dict_descriptors(self):
class Base:
pass
class Sub(Base):
pass
self.assertIn("__dict__", Base.__dict__)
self.assertNotIn("__dict__", Sub.__dict__)
def test_bound_method_repr(self):
class Foo:
def method(self):
pass
self.assertRegex(repr(Foo().method),
r"<bound method .*Foo\.method of <.*Foo object at .*>>")
class Base:
def method(self):
pass
class Derived1(Base):
pass
class Derived2(Base):
def method(self):
pass
base = Base()
derived1 = Derived1()
derived2 = Derived2()
super_d2 = super(Derived2, derived2)
self.assertRegex(repr(base.method),
r"<bound method .*Base\.method of <.*Base object at .*>>")
self.assertRegex(repr(derived1.method),
r"<bound method .*Base\.method of <.*Derived1 object at .*>>")
self.assertRegex(repr(derived2.method),
r"<bound method .*Derived2\.method of <.*Derived2 object at .*>>")
self.assertRegex(repr(super_d2.method),
r"<bound method .*Base\.method of <.*Derived2 object at .*>>")
class Foo:
@classmethod
def method(cls):
pass
foo = Foo()
self.assertRegex(repr(foo.method), # access via instance
r"<bound method .*Foo\.method of <class '.*Foo'>>")
self.assertRegex(repr(Foo.method), # access via the class
r"<bound method .*Foo\.method of <class '.*Foo'>>")
class MyCallable:
def __call__(self, arg):
pass
func = MyCallable() # func has no __name__ or __qualname__ attributes
instance = object()
method = types.MethodType(func, instance)
self.assertRegex(repr(method),
r"<bound method \? of <object object at .*>>")
func.__name__ = "name"
self.assertRegex(repr(method),
r"<bound method name of <object object at .*>>")
func.__qualname__ = "qualname"
self.assertRegex(repr(method),
r"<bound method qualname of <object object at .*>>")
class DictProxyTests(unittest.TestCase):
def setUp(self):
class C(object):
def meth(self):
pass
self.C = C
@unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
'trace function introduces __local__')
def test_iter_keys(self):
# Testing dict-proxy keys...
it = self.C.__dict__.keys()
self.assertNotIsInstance(it, list)
keys = list(it)
keys.sort()
self.assertEqual(keys, ['__dict__', '__doc__', '__module__',
'__weakref__', 'meth'])
@unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
'trace function introduces __local__')
def test_iter_values(self):
# Testing dict-proxy values...
it = self.C.__dict__.values()
self.assertNotIsInstance(it, list)
values = list(it)
self.assertEqual(len(values), 5)
@unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
'trace function introduces __local__')
def test_iter_items(self):
# Testing dict-proxy iteritems...
it = self.C.__dict__.items()
self.assertNotIsInstance(it, list)
keys = [item[0] for item in it]
keys.sort()
self.assertEqual(keys, ['__dict__', '__doc__', '__module__',
'__weakref__', 'meth'])
def test_dict_type_with_metaclass(self):
# Testing type of __dict__ when metaclass set...
class B(object):
pass
class M(type):
pass
class C(metaclass=M):
# In 2.3a1, C.__dict__ was a real dict rather than a dict proxy
pass
self.assertEqual(type(C.__dict__), type(B.__dict__))
def test_repr(self):
# Testing mappingproxy.__repr__.
# We can't blindly compare with the repr of another dict as ordering
# of keys and values is arbitrary and may differ.
r = repr(self.C.__dict__)
self.assertTrue(r.startswith('mappingproxy('), r)
self.assertTrue(r.endswith(')'), r)
for k, v in self.C.__dict__.items():
self.assertIn('{!r}: {!r}'.format(k, v), r)
class PTypesLongInitTest(unittest.TestCase):
# This is in its own TestCase so that it can be run before any other tests.
def test_pytype_long_ready(self):
# Testing SF bug 551412 ...
# This dumps core when SF bug 551412 isn't fixed --
# but only when test_descr.py is run separately.
# (That can't be helped -- as soon as PyType_Ready()
# is called for PyLong_Type, the bug is gone.)
class UserLong(object):
def __pow__(self, *args):
pass
try:
pow(0, UserLong(), 0)
except:
pass
# Another segfault only when run early
# (before PyType_Ready(tuple) is called)
type.mro(tuple)
class MiscTests(unittest.TestCase):
def test_type_lookup_mro_reference(self):
# Issue #14199: _PyType_Lookup() has to keep a strong reference to
# the type MRO because it may be modified during the lookup, if
# __bases__ is set during the lookup for example.
class MyKey(object):
def __hash__(self):
return hash('mykey')
def __eq__(self, other):
X.__bases__ = (Base2,)
class Base(object):
mykey = 'from Base'
mykey2 = 'from Base'
class Base2(object):
mykey = 'from Base2'
mykey2 = 'from Base2'
X = type('X', (Base,), {MyKey(): 5})
# mykey is read from Base
self.assertEqual(X.mykey, 'from Base')
# mykey2 is read from Base2 because MyKey.__eq__ has set __bases__
self.assertEqual(X.mykey2, 'from Base2')
class PicklingTests(unittest.TestCase):
def _check_reduce(self, proto, obj, args=(), kwargs={}, state=None,
listitems=None, dictitems=None):
if proto >= 2:
reduce_value = obj.__reduce_ex__(proto)
if kwargs:
self.assertEqual(reduce_value[0], copyreg.__newobj_ex__)
self.assertEqual(reduce_value[1], (type(obj), args, kwargs))
else:
self.assertEqual(reduce_value[0], copyreg.__newobj__)
self.assertEqual(reduce_value[1], (type(obj),) + args)
self.assertEqual(reduce_value[2], state)
if listitems is not None:
self.assertListEqual(list(reduce_value[3]), listitems)
else:
self.assertIsNone(reduce_value[3])
if dictitems is not None:
self.assertDictEqual(dict(reduce_value[4]), dictitems)
else:
self.assertIsNone(reduce_value[4])
else:
base_type = type(obj).__base__
reduce_value = (copyreg._reconstructor,
(type(obj),
base_type,
None if base_type is object else base_type(obj)))
if state is not None:
reduce_value += (state,)
self.assertEqual(obj.__reduce_ex__(proto), reduce_value)
self.assertEqual(obj.__reduce__(), reduce_value)
def test_reduce(self):
protocols = range(pickle.HIGHEST_PROTOCOL + 1)
args = (-101, "spam")
kwargs = {'bacon': -201, 'fish': -301}
state = {'cheese': -401}
class C1:
def __getnewargs__(self):
return args
obj = C1()
for proto in protocols:
self._check_reduce(proto, obj, args)
for name, value in state.items():
setattr(obj, name, value)
for proto in protocols:
self._check_reduce(proto, obj, args, state=state)
class C2:
def __getnewargs__(self):
return "bad args"
obj = C2()
for proto in protocols:
if proto >= 2:
with self.assertRaises(TypeError):
obj.__reduce_ex__(proto)
class C3:
def __getnewargs_ex__(self):
return (args, kwargs)
obj = C3()
for proto in protocols:
if proto >= 4:
self._check_reduce(proto, obj, args, kwargs)
elif proto >= 2:
with self.assertRaises(ValueError):
obj.__reduce_ex__(proto)
class C4:
def __getnewargs_ex__(self):
return (args, "bad dict")
class C5:
def __getnewargs_ex__(self):
return ("bad tuple", kwargs)
class C6:
def __getnewargs_ex__(self):
return ()
class C7:
def __getnewargs_ex__(self):
return "bad args"
for proto in protocols:
for cls in C4, C5, C6, C7:
obj = cls()
if proto >= 2:
with self.assertRaises((TypeError, ValueError)):
obj.__reduce_ex__(proto)
class C8:
def __getnewargs_ex__(self):
return (args, kwargs)
obj = C8()
for proto in protocols:
if 2 <= proto < 4:
with self.assertRaises(ValueError):
obj.__reduce_ex__(proto)
class C9:
def __getnewargs_ex__(self):
return (args, {})
obj = C9()
for proto in protocols:
self._check_reduce(proto, obj, args)
class C10:
def __getnewargs_ex__(self):
raise IndexError
obj = C10()
for proto in protocols:
if proto >= 2:
with self.assertRaises(IndexError):
obj.__reduce_ex__(proto)
class C11:
def __getstate__(self):
return state
obj = C11()
for proto in protocols:
self._check_reduce(proto, obj, state=state)
class C12:
def __getstate__(self):
return "not dict"
obj = C12()
for proto in protocols:
self._check_reduce(proto, obj, state="not dict")
class C13:
def __getstate__(self):
raise IndexError
obj = C13()
for proto in protocols:
with self.assertRaises(IndexError):
obj.__reduce_ex__(proto)
if proto < 2:
with self.assertRaises(IndexError):
obj.__reduce__()
class C14:
__slots__ = tuple(state)
def __init__(self):
for name, value in state.items():
setattr(self, name, value)
obj = C14()
for proto in protocols:
if proto >= 2:
self._check_reduce(proto, obj, state=(None, state))
else:
with self.assertRaises(TypeError):
obj.__reduce_ex__(proto)
with self.assertRaises(TypeError):
obj.__reduce__()
class C15(dict):
pass
obj = C15({"quebec": -601})
for proto in protocols:
self._check_reduce(proto, obj, dictitems=dict(obj))
class C16(list):
pass
obj = C16(["yukon"])
for proto in protocols:
self._check_reduce(proto, obj, listitems=list(obj))
def test_special_method_lookup(self):
protocols = range(pickle.HIGHEST_PROTOCOL + 1)
class Picky:
def __getstate__(self):
return {}
def __getattr__(self, attr):
if attr in ("__getnewargs__", "__getnewargs_ex__"):
raise AssertionError(attr)
return None
for protocol in protocols:
state = {} if protocol >= 2 else None
self._check_reduce(protocol, Picky(), state=state)
def _assert_is_copy(self, obj, objcopy, msg=None):
"""Utility method to verify if two objects are copies of each others.
"""
if msg is None:
msg = "{!r} is not a copy of {!r}".format(obj, objcopy)
if type(obj).__repr__ is object.__repr__:
# We have this limitation for now because we use the object's repr
# to help us verify that the two objects are copies. This allows
# us to delegate the non-generic verification logic to the objects
# themselves.
raise ValueError("object passed to _assert_is_copy must " +
"override the __repr__ method.")
self.assertIsNot(obj, objcopy, msg=msg)
self.assertIs(type(obj), type(objcopy), msg=msg)
if hasattr(obj, '__dict__'):
self.assertDictEqual(obj.__dict__, objcopy.__dict__, msg=msg)
self.assertIsNot(obj.__dict__, objcopy.__dict__, msg=msg)
if hasattr(obj, '__slots__'):
self.assertListEqual(obj.__slots__, objcopy.__slots__, msg=msg)
for slot in obj.__slots__:
self.assertEqual(
hasattr(obj, slot), hasattr(objcopy, slot), msg=msg)
self.assertEqual(getattr(obj, slot, None),
getattr(objcopy, slot, None), msg=msg)
self.assertEqual(repr(obj), repr(objcopy), msg=msg)
@staticmethod
def _generate_pickle_copiers():
"""Utility method to generate the many possible pickle configurations.
"""
class PickleCopier:
"This class copies object using pickle."
def __init__(self, proto, dumps, loads):
self.proto = proto
self.dumps = dumps
self.loads = loads
def copy(self, obj):
return self.loads(self.dumps(obj, self.proto))
def __repr__(self):
# We try to be as descriptive as possible here since this is
# the string which we will allow us to tell the pickle
# configuration we are using during debugging.
return ("PickleCopier(proto={}, dumps={}.{}, loads={}.{})"
.format(self.proto,
self.dumps.__module__, self.dumps.__qualname__,
self.loads.__module__, self.loads.__qualname__))
return (PickleCopier(*args) for args in
itertools.product(range(pickle.HIGHEST_PROTOCOL + 1),
{pickle.dumps, pickle._dumps},
{pickle.loads, pickle._loads}))
def test_pickle_slots(self):
# Tests pickling of classes with __slots__.
# Pickling of classes with __slots__ but without __getstate__ should
# fail (if using protocol 0 or 1)
global C
class C:
__slots__ = ['a']
with self.assertRaises(TypeError):
pickle.dumps(C(), 0)
global D
class D(C):
pass
with self.assertRaises(TypeError):
pickle.dumps(D(), 0)
class C:
"A class with __getstate__ and __setstate__ implemented."
__slots__ = ['a']
def __getstate__(self):
state = getattr(self, '__dict__', {}).copy()
for cls in type(self).__mro__:
for slot in cls.__dict__.get('__slots__', ()):
try:
state[slot] = getattr(self, slot)
except AttributeError:
pass
return state
def __setstate__(self, state):
for k, v in state.items():
setattr(self, k, v)
def __repr__(self):
return "%s()<%r>" % (type(self).__name__, self.__getstate__())
class D(C):
"A subclass of a class with slots."
pass
global E
class E(C):
"A subclass with an extra slot."
__slots__ = ['b']
# Now it should work
for pickle_copier in self._generate_pickle_copiers():
with self.subTest(pickle_copier=pickle_copier):
x = C()
y = pickle_copier.copy(x)
self._assert_is_copy(x, y)
x.a = 42
y = pickle_copier.copy(x)
self._assert_is_copy(x, y)
x = D()
x.a = 42
x.b = 100
y = pickle_copier.copy(x)
self._assert_is_copy(x, y)
x = E()
x.a = 42
x.b = "foo"
y = pickle_copier.copy(x)
self._assert_is_copy(x, y)
def test_reduce_copying(self):
# Tests pickling and copying new-style classes and objects.
global C1
class C1:
"The state of this class is copyable via its instance dict."
ARGS = (1, 2)
NEED_DICT_COPYING = True
def __init__(self, a, b):
super().__init__()
self.a = a
self.b = b
def __repr__(self):
return "C1(%r, %r)" % (self.a, self.b)
global C2
class C2(list):
"A list subclass copyable via __getnewargs__."
ARGS = (1, 2)
NEED_DICT_COPYING = False
def __new__(cls, a, b):
self = super().__new__(cls)
self.a = a
self.b = b
return self
def __init__(self, *args):
super().__init__()
# This helps testing that __init__ is not called during the
# unpickling process, which would cause extra appends.
self.append("cheese")
@classmethod
def __getnewargs__(cls):
return cls.ARGS
def __repr__(self):
return "C2(%r, %r)<%r>" % (self.a, self.b, list(self))
global C3
class C3(list):
"A list subclass copyable via __getstate__."
ARGS = (1, 2)
NEED_DICT_COPYING = False
def __init__(self, a, b):
self.a = a
self.b = b
# This helps testing that __init__ is not called during the
# unpickling process, which would cause extra appends.
self.append("cheese")
@classmethod
def __getstate__(cls):
return cls.ARGS
def __setstate__(self, state):
a, b = state
self.a = a
self.b = b
def __repr__(self):
return "C3(%r, %r)<%r>" % (self.a, self.b, list(self))
global C4
class C4(int):
"An int subclass copyable via __getnewargs__."
ARGS = ("hello", "world", 1)
NEED_DICT_COPYING = False
def __new__(cls, a, b, value):
self = super().__new__(cls, value)
self.a = a
self.b = b
return self
@classmethod
def __getnewargs__(cls):
return cls.ARGS
def __repr__(self):
return "C4(%r, %r)<%r>" % (self.a, self.b, int(self))
global C5
class C5(int):
"An int subclass copyable via __getnewargs_ex__."
ARGS = (1, 2)
KWARGS = {'value': 3}
NEED_DICT_COPYING = False
def __new__(cls, a, b, *, value=0):
self = super().__new__(cls, value)
self.a = a
self.b = b
return self
@classmethod
def __getnewargs_ex__(cls):
return (cls.ARGS, cls.KWARGS)
def __repr__(self):
return "C5(%r, %r)<%r>" % (self.a, self.b, int(self))
test_classes = (C1, C2, C3, C4, C5)
# Testing copying through pickle
pickle_copiers = self._generate_pickle_copiers()
for cls, pickle_copier in itertools.product(test_classes, pickle_copiers):
with self.subTest(cls=cls, pickle_copier=pickle_copier):
kwargs = getattr(cls, 'KWARGS', {})
obj = cls(*cls.ARGS, **kwargs)
proto = pickle_copier.proto
if 2 <= proto < 4 and hasattr(cls, '__getnewargs_ex__'):
with self.assertRaises(ValueError):
pickle_copier.dumps(obj, proto)
continue
objcopy = pickle_copier.copy(obj)
self._assert_is_copy(obj, objcopy)
# For test classes that supports this, make sure we didn't go
# around the reduce protocol by simply copying the attribute
# dictionary. We clear attributes using the previous copy to
# not mutate the original argument.
if proto >= 2 and not cls.NEED_DICT_COPYING:
objcopy.__dict__.clear()
objcopy2 = pickle_copier.copy(objcopy)
self._assert_is_copy(obj, objcopy2)
# Testing copying through copy.deepcopy()
for cls in test_classes:
with self.subTest(cls=cls):
kwargs = getattr(cls, 'KWARGS', {})
obj = cls(*cls.ARGS, **kwargs)
# XXX: We need to modify the copy module to support PEP 3154's
# reduce protocol 4.
if hasattr(cls, '__getnewargs_ex__'):
continue
objcopy = deepcopy(obj)
self._assert_is_copy(obj, objcopy)
# For test classes that supports this, make sure we didn't go
# around the reduce protocol by simply copying the attribute
# dictionary. We clear attributes using the previous copy to
# not mutate the original argument.
if not cls.NEED_DICT_COPYING:
objcopy.__dict__.clear()
objcopy2 = deepcopy(objcopy)
self._assert_is_copy(obj, objcopy2)
class SharedKeyTests(unittest.TestCase):
@support.cpython_only
def test_subclasses(self):
# Verify that subclasses can share keys (per PEP 412)
class A:
pass
class B(A):
pass
a, b = A(), B()
self.assertEqual(sys.getsizeof(vars(a)), sys.getsizeof(vars(b)))
self.assertLess(sys.getsizeof(vars(a)), sys.getsizeof({}))
a.x, a.y, a.z, a.w = range(4)
self.assertNotEqual(sys.getsizeof(vars(a)), sys.getsizeof(vars(b)))
a2 = A()
self.assertEqual(sys.getsizeof(vars(a)), sys.getsizeof(vars(a2)))
self.assertLess(sys.getsizeof(vars(a)), sys.getsizeof({}))
b.u, b.v, b.w, b.t = range(4)
self.assertLess(sys.getsizeof(vars(b)), sys.getsizeof({}))
class DebugHelperMeta(type):
"""
Sets default __doc__ and simplifies repr() output.
"""
def __new__(mcls, name, bases, attrs):
if attrs.get('__doc__') is None:
attrs['__doc__'] = name # helps when debugging with gdb
return type.__new__(mcls, name, bases, attrs)
def __repr__(cls):
return repr(cls.__name__)
class MroTest(unittest.TestCase):
"""
Regressions for some bugs revealed through
mcsl.mro() customization (typeobject.c: mro_internal()) and
cls.__bases__ assignment (typeobject.c: type_set_bases()).
"""
def setUp(self):
self.step = 0
self.ready = False
def step_until(self, limit):
ret = (self.step < limit)
if ret:
self.step += 1
return ret
def test_incomplete_set_bases_on_self(self):
"""
type_set_bases must be aware that type->tp_mro can be NULL.
"""
class M(DebugHelperMeta):
def mro(cls):
if self.step_until(1):
assert cls.__mro__ is None
cls.__bases__ += ()
return type.mro(cls)
class A(metaclass=M):
pass
def test_reent_set_bases_on_base(self):
"""
Deep reentrancy must not over-decref old_mro.
"""
class M(DebugHelperMeta):
def mro(cls):
if cls.__mro__ is not None and cls.__name__ == 'B':
# 4-5 steps are usually enough to make it crash somewhere
if self.step_until(10):
A.__bases__ += ()
return type.mro(cls)
class A(metaclass=M):
pass
class B(A):
pass
B.__bases__ += ()
def test_reent_set_bases_on_direct_base(self):
"""
Similar to test_reent_set_bases_on_base, but may crash differently.
"""
class M(DebugHelperMeta):
def mro(cls):
base = cls.__bases__[0]
if base is not object:
if self.step_until(5):
base.__bases__ += ()
return type.mro(cls)
class A(metaclass=M):
pass
class B(A):
pass
class C(B):
pass
def test_reent_set_bases_tp_base_cycle(self):
"""
type_set_bases must check for an inheritance cycle not only through
MRO of the type, which may be not yet updated in case of reentrance,
but also through tp_base chain, which is assigned before diving into
inner calls to mro().
Otherwise, the following snippet can loop forever:
do {
// ...
type = type->tp_base;
} while (type != NULL);
Functions that rely on tp_base (like solid_base and PyType_IsSubtype)
would not be happy in that case, causing a stack overflow.
"""
class M(DebugHelperMeta):
def mro(cls):
if self.ready:
if cls.__name__ == 'B1':
B2.__bases__ = (B1,)
if cls.__name__ == 'B2':
B1.__bases__ = (B2,)
return type.mro(cls)
class A(metaclass=M):
pass
class B1(A):
pass
class B2(A):
pass
self.ready = True
with self.assertRaises(TypeError):
B1.__bases__ += ()
def test_tp_subclasses_cycle_in_update_slots(self):
"""
type_set_bases must check for reentrancy upon finishing its job
by updating tp_subclasses of old/new bases of the type.
Otherwise, an implicit inheritance cycle through tp_subclasses
can break functions that recurse on elements of that field
(like recurse_down_subclasses and mro_hierarchy) eventually
leading to a stack overflow.
"""
class M(DebugHelperMeta):
def mro(cls):
if self.ready and cls.__name__ == 'C':
self.ready = False
C.__bases__ = (B2,)
return type.mro(cls)
class A(metaclass=M):
pass
class B1(A):
pass
class B2(A):
pass
class C(A):
pass
self.ready = True
C.__bases__ = (B1,)
B1.__bases__ = (C,)
self.assertEqual(C.__bases__, (B2,))
self.assertEqual(B2.__subclasses__(), [C])
self.assertEqual(B1.__subclasses__(), [])
self.assertEqual(B1.__bases__, (C,))
self.assertEqual(C.__subclasses__(), [B1])
def test_tp_subclasses_cycle_error_return_path(self):
"""
The same as test_tp_subclasses_cycle_in_update_slots, but tests
a code path executed on error (goto bail).
"""
class E(Exception):
pass
class M(DebugHelperMeta):
def mro(cls):
if self.ready and cls.__name__ == 'C':
if C.__bases__ == (B2,):
self.ready = False
else:
C.__bases__ = (B2,)
raise E
return type.mro(cls)
class A(metaclass=M):
pass
class B1(A):
pass
class B2(A):
pass
class C(A):
pass
self.ready = True
with self.assertRaises(E):
C.__bases__ = (B1,)
B1.__bases__ = (C,)
self.assertEqual(C.__bases__, (B2,))
self.assertEqual(C.__mro__, tuple(type.mro(C)))
def test_incomplete_extend(self):
"""
Extending an unitialized type with type->tp_mro == NULL must
throw a reasonable TypeError exception, instead of failing
with PyErr_BadInternalCall.
"""
class M(DebugHelperMeta):
def mro(cls):
if cls.__mro__ is None and cls.__name__ != 'X':
with self.assertRaises(TypeError):
class X(cls):
pass
return type.mro(cls)
class A(metaclass=M):
pass
def test_incomplete_super(self):
"""
Attrubute lookup on a super object must be aware that
its target type can be uninitialized (type->tp_mro == NULL).
"""
class M(DebugHelperMeta):
def mro(cls):
if cls.__mro__ is None:
with self.assertRaises(AttributeError):
super(cls, cls).xxx
return type.mro(cls)
class A(metaclass=M):
pass
def test_main():
# Run all local test cases, with PTypesLongInitTest first.
support.run_unittest(PTypesLongInitTest, OperatorsTest,
ClassPropertiesAndMethods, DictProxyTests,
MiscTests, PicklingTests, SharedKeyTests,
MroTest)
if __name__ == "__main__":
test_main()
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