cpython/Lib/test/test_descr.py

830 lines
22 KiB
Python

# Test descriptor-related enhancements
from test_support import verify, verbose
from copy import deepcopy
def testunop(a, res, expr="len(a)", meth="__len__"):
if verbose: print "checking", expr
dict = {'a': a}
verify(eval(expr, dict) == res)
t = type(a)
m = getattr(t, meth)
verify(m == t.__dict__[meth])
verify(m(a) == res)
bm = getattr(a, meth)
verify(bm() == res)
def testbinop(a, b, res, expr="a+b", meth="__add__"):
if verbose: print "checking", expr
dict = {'a': a, 'b': b}
verify(eval(expr, dict) == res)
t = type(a)
m = getattr(t, meth)
verify(m == t.__dict__[meth])
verify(m(a, b) == res)
bm = getattr(a, meth)
verify(bm(b) == res)
def testternop(a, b, c, res, expr="a[b:c]", meth="__getslice__"):
if verbose: print "checking", expr
dict = {'a': a, 'b': b, 'c': c}
verify(eval(expr, dict) == res)
t = type(a)
m = getattr(t, meth)
verify(m == t.__dict__[meth])
verify(m(a, b, c) == res)
bm = getattr(a, meth)
verify(bm(b, c) == res)
def testsetop(a, b, res, stmt="a+=b", meth="__iadd__"):
if verbose: print "checking", stmt
dict = {'a': deepcopy(a), 'b': b}
exec stmt in dict
verify(dict['a'] == res)
t = type(a)
m = getattr(t, meth)
verify(m == t.__dict__[meth])
dict['a'] = deepcopy(a)
m(dict['a'], b)
verify(dict['a'] == res)
dict['a'] = deepcopy(a)
bm = getattr(dict['a'], meth)
bm(b)
verify(dict['a'] == res)
def testset2op(a, b, c, res, stmt="a[b]=c", meth="__setitem__"):
if verbose: print "checking", stmt
dict = {'a': deepcopy(a), 'b': b, 'c': c}
exec stmt in dict
verify(dict['a'] == res)
t = type(a)
m = getattr(t, meth)
verify(m == t.__dict__[meth])
dict['a'] = deepcopy(a)
m(dict['a'], b, c)
verify(dict['a'] == res)
dict['a'] = deepcopy(a)
bm = getattr(dict['a'], meth)
bm(b, c)
verify(dict['a'] == res)
def testset3op(a, b, c, d, res, stmt="a[b:c]=d", meth="__setslice__"):
if verbose: print "checking", stmt
dict = {'a': deepcopy(a), 'b': b, 'c': c, 'd': d}
exec stmt in dict
verify(dict['a'] == res)
t = type(a)
m = getattr(t, meth)
verify(m == t.__dict__[meth])
dict['a'] = deepcopy(a)
m(dict['a'], b, c, d)
verify(dict['a'] == res)
dict['a'] = deepcopy(a)
bm = getattr(dict['a'], meth)
bm(b, c, d)
verify(dict['a'] == res)
def lists():
if verbose: print "Testing list operations..."
testbinop([1], [2], [1,2], "a+b", "__add__")
testbinop([1,2,3], 2, 1, "b in a", "__contains__")
testbinop([1,2,3], 4, 0, "b in a", "__contains__")
testbinop([1,2,3], 1, 2, "a[b]", "__getitem__")
testternop([1,2,3], 0, 2, [1,2], "a[b:c]", "__getslice__")
testsetop([1], [2], [1,2], "a+=b", "__iadd__")
testsetop([1,2], 3, [1,2,1,2,1,2], "a*=b", "__imul__")
testunop([1,2,3], 3, "len(a)", "__len__")
testbinop([1,2], 3, [1,2,1,2,1,2], "a*b", "__mul__")
testbinop([1,2], 3, [1,2,1,2,1,2], "b*a", "__rmul__")
testset2op([1,2], 1, 3, [1,3], "a[b]=c", "__setitem__")
testset3op([1,2,3,4], 1, 3, [5,6], [1,5,6,4], "a[b:c]=d", "__setslice__")
def dicts():
if verbose: print "Testing dict operations..."
testbinop({1:2}, {2:1}, -1, "cmp(a,b)", "__cmp__")
testbinop({1:2,3:4}, 1, 1, "b in a", "__contains__")
testbinop({1:2,3:4}, 2, 0, "b in a", "__contains__")
testbinop({1:2,3:4}, 1, 2, "a[b]", "__getitem__")
d = {1:2,3:4}
l1 = []
for i in d.keys(): l1.append(i)
l = []
for i in iter(d): l.append(i)
verify(l == l1)
l = []
for i in d.__iter__(): l.append(i)
verify(l == l1)
l = []
for i in dictionary.__iter__(d): l.append(i)
verify(l == l1)
d = {1:2, 3:4}
testunop(d, 2, "len(a)", "__len__")
verify(eval(repr(d), {}) == d)
verify(eval(d.__repr__(), {}) == d)
testset2op({1:2,3:4}, 2, 3, {1:2,2:3,3:4}, "a[b]=c", "__setitem__")
binops = {
'add': '+',
'sub': '-',
'mul': '*',
'div': '/',
'mod': '%',
'divmod': 'divmod',
'pow': '**',
'lshift': '<<',
'rshift': '>>',
'and': '&',
'xor': '^',
'or': '|',
'cmp': 'cmp',
'lt': '<',
'le': '<=',
'eq': '==',
'ne': '!=',
'gt': '>',
'ge': '>=',
}
for name, expr in binops.items():
if expr.islower():
expr = expr + "(a, b)"
else:
expr = 'a %s b' % expr
binops[name] = expr
unops = {
'pos': '+',
'neg': '-',
'abs': 'abs',
'invert': '~',
'int': 'int',
'long': 'long',
'float': 'float',
'oct': 'oct',
'hex': 'hex',
}
for name, expr in unops.items():
if expr.islower():
expr = expr + "(a)"
else:
expr = '%s a' % expr
unops[name] = expr
def numops(a, b, skip=[]):
dict = {'a': a, 'b': b}
for name, expr in binops.items():
if name not in skip:
name = "__%s__" % name
if hasattr(a, name):
res = eval(expr, dict)
testbinop(a, b, res, expr, name)
for name, expr in unops.items():
name = "__%s__" % name
if hasattr(a, name):
res = eval(expr, dict)
testunop(a, res, expr, name)
def ints():
if verbose: print "Testing int operations..."
numops(100, 3)
def longs():
if verbose: print "Testing long operations..."
numops(100L, 3L)
def floats():
if verbose: print "Testing float operations..."
numops(100.0, 3.0)
def complexes():
if verbose: print "Testing complex operations..."
numops(100.0j, 3.0j, skip=['lt', 'le', 'gt', 'ge'])
class Number(complex):
__slots__ = ['prec']
def __init__(self, *args, **kwds):
self.prec = kwds.get('prec', 12)
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)
verify(`a` == "3.14")
verify(a.prec == 6)
def spamlists():
if verbose: print "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
testbinop(spamlist([1]), spamlist([2]), spamlist([1,2]), "a+b", "__add__")
testbinop(spamlist([1,2,3]), 2, 1, "b in a", "__contains__")
testbinop(spamlist([1,2,3]), 4, 0, "b in a", "__contains__")
testbinop(spamlist([1,2,3]), 1, 2, "a[b]", "__getitem__")
testternop(spamlist([1,2,3]), 0, 2, spamlist([1,2]),
"a[b:c]", "__getslice__")
testsetop(spamlist([1]), spamlist([2]), spamlist([1,2]),
"a+=b", "__iadd__")
testsetop(spamlist([1,2]), 3, spamlist([1,2,1,2,1,2]), "a*=b", "__imul__")
testunop(spamlist([1,2,3]), 3, "len(a)", "__len__")
testbinop(spamlist([1,2]), 3, spamlist([1,2,1,2,1,2]), "a*b", "__mul__")
testbinop(spamlist([1,2]), 3, spamlist([1,2,1,2,1,2]), "b*a", "__rmul__")
testset2op(spamlist([1,2]), 1, 3, spamlist([1,3]), "a[b]=c", "__setitem__")
testset3op(spamlist([1,2,3,4]), 1, 3, spamlist([5,6]),
spamlist([1,5,6,4]), "a[b:c]=d", "__setslice__")
# Test subclassing
class C(spam.spamlist):
def foo(self): return 1
a = C()
verify(a == [])
verify(a.foo() == 1)
a.append(100)
verify(a == [100])
verify(a.getstate() == 0)
a.setstate(42)
verify(a.getstate() == 42)
def spamdicts():
if verbose: print "Testing spamdict operations..."
import copy, xxsubtype as spam
def spamdict(d, memo=None):
import xxsubtype as spam
sd = spam.spamdict()
for k, v in d.items(): sd[k] = v
return sd
# This is an ugly hack:
copy._deepcopy_dispatch[spam.spamdict] = spamdict
testbinop(spamdict({1:2}), spamdict({2:1}), -1, "cmp(a,b)", "__cmp__")
testbinop(spamdict({1:2,3:4}), 1, 1, "b in a", "__contains__")
testbinop(spamdict({1:2,3:4}), 2, 0, "b in a", "__contains__")
testbinop(spamdict({1:2,3:4}), 1, 2, "a[b]", "__getitem__")
d = spamdict({1:2,3:4})
l1 = []
for i in d.keys(): l1.append(i)
l = []
for i in iter(d): l.append(i)
verify(l == l1)
l = []
for i in d.__iter__(): l.append(i)
verify(l == l1)
l = []
for i in type(spamdict({})).__iter__(d): l.append(i)
verify(l == l1)
straightd = {1:2, 3:4}
spamd = spamdict(straightd)
testunop(spamd, 2, "len(a)", "__len__")
testunop(spamd, repr(straightd), "repr(a)", "__repr__")
testset2op(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()
verify(a.items() == [])
verify(a.foo() == 1)
a['foo'] = 'bar'
verify(a.items() == [('foo', 'bar')])
verify(a.getstate() == 0)
a.setstate(100)
verify(a.getstate() == 100)
def pydicts():
if verbose: print "Testing Python subclass of dict..."
verify(issubclass(dictionary, dictionary))
verify(isinstance({}, dictionary))
d = dictionary()
verify(d == {})
verify(d.__class__ is dictionary)
verify(isinstance(d, dictionary))
class C(dictionary):
state = -1
def __init__(self, *a, **kw):
if a:
assert len(a) == 1
self.state = a[0]
if kw:
for k, v in kw.items(): self[v] = k
def __getitem__(self, key):
return self.get(key, 0)
def __setitem__(self, key, value):
assert isinstance(key, type(0))
dictionary.__setitem__(self, key, value)
def setstate(self, state):
self.state = state
def getstate(self):
return self.state
verify(issubclass(C, dictionary))
a1 = C(12)
verify(a1.state == 12)
a2 = C(foo=1, bar=2)
verify(a2[1] == 'foo' and a2[2] == 'bar')
a = C()
verify(a.state == -1)
verify(a.getstate() == -1)
a.setstate(0)
verify(a.state == 0)
verify(a.getstate() == 0)
a.setstate(10)
verify(a.state == 10)
verify(a.getstate() == 10)
verify(a[42] == 0)
a[42] = 24
verify(a[42] == 24)
if verbose: print "pydict stress test ..."
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):
verify(a[i][j] == i*j)
def pylists():
if verbose: print "Testing Python subclass of list..."
class C(list):
def __getitem__(self, i):
return list.__getitem__(self, i) + 100
def __getslice__(self, i, j):
return (i, j)
a = C()
a.extend([0,1,2])
verify(a[0] == 100)
verify(a[1] == 101)
verify(a[2] == 102)
verify(a[100:200] == (100,200))
def metaclass():
if verbose: print "Testing __metaclass__..."
global C
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()
verify(a.getstate() == 0)
a.setstate(10)
verify(a.getstate() == 10)
class D:
class __metaclass__(type):
def myself(cls): return cls
verify(D.myself() == D)
import sys
MT = type(sys)
def pymods():
if verbose: print "Testing Python subclass of module..."
global log
log = []
class MM(MT):
def __init__(self):
MT.__init__(self)
def __getattr__(self, name):
log.append(("getattr", name))
return MT.__getattr__(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.foo = 12
x = a.foo
del a.foo
verify(log == [('getattr', '__init__'),
('getattr', '__setattr__'),
("setattr", "foo", 12),
("getattr", "foo"),
('getattr', '__delattr__'),
("delattr", "foo")], log)
def multi():
if verbose: print "Testing multiple inheritance..."
global C
class C(object):
def __init__(self):
self.__state = 0
def getstate(self):
return self.__state
def setstate(self, state):
self.__state = state
a = C()
verify(a.getstate() == 0)
a.setstate(10)
verify(a.getstate() == 10)
class D(dictionary, C):
def __init__(self):
type({}).__init__(self)
C.__init__(self)
d = D()
verify(d.keys() == [])
d["hello"] = "world"
verify(d.items() == [("hello", "world")])
verify(d["hello"] == "world")
verify(d.getstate() == 0)
d.setstate(10)
verify(d.getstate() == 10)
verify(D.__mro__ == (D, dictionary, C, object))
def diamond():
if verbose: print "Testing multiple inheritance special cases..."
class A(object):
def spam(self): return "A"
verify(A().spam() == "A")
class B(A):
def boo(self): return "B"
def spam(self): return "B"
verify(B().spam() == "B")
verify(B().boo() == "B")
class C(A):
def boo(self): return "C"
verify(C().spam() == "A")
verify(C().boo() == "C")
class D(B, C): pass
verify(D().spam() == "B")
verify(D().boo() == "B")
verify(D.__mro__ == (D, B, C, A, object))
class E(C, B): pass
verify(E().spam() == "B")
verify(E().boo() == "C")
verify(E.__mro__ == (E, C, B, A, object))
class F(D, E): pass
verify(F().spam() == "B")
verify(F().boo() == "B")
verify(F.__mro__ == (F, D, E, B, C, A, object))
class G(E, D): pass
verify(G().spam() == "B")
verify(G().boo() == "C")
verify(G.__mro__ == (G, E, D, C, B, A, object))
def objects():
if verbose: print "Testing object class..."
a = object()
verify(a.__class__ == object == type(a))
b = object()
verify(a is not b)
verify(not hasattr(a, "foo"))
try:
a.foo = 12
except TypeError:
pass
else:
verify(0, "object() should not allow setting a foo attribute")
verify(not hasattr(object(), "__dict__"))
class Cdict(object):
pass
x = Cdict()
verify(x.__dict__ is None)
x.foo = 1
verify(x.foo == 1)
verify(x.__dict__ == {'foo': 1})
def slots():
if verbose: print "Testing __slots__..."
class C0(object):
__slots__ = []
x = C0()
verify(not hasattr(x, "__dict__"))
verify(not hasattr(x, "foo"))
class C1(object):
__slots__ = ['a']
x = C1()
verify(not hasattr(x, "__dict__"))
verify(x.a == None)
x.a = 1
verify(x.a == 1)
del x.a
verify(x.a == None)
class C3(object):
__slots__ = ['a', 'b', 'c']
x = C3()
verify(not hasattr(x, "__dict__"))
verify(x.a is None)
verify(x.b is None)
verify(x.c is None)
x.a = 1
x.b = 2
x.c = 3
verify(x.a == 1)
verify(x.b == 2)
verify(x.c == 3)
def dynamics():
if verbose: print "Testing __dynamic__..."
verify(object.__dynamic__ == 0)
verify(list.__dynamic__ == 0)
class S1:
__metaclass__ = type
verify(S1.__dynamic__ == 0)
class S(object):
pass
verify(C.__dynamic__ == 0)
class D(object):
__dynamic__ = 1
verify(D.__dynamic__ == 1)
class E(D, S):
pass
verify(E.__dynamic__ == 1)
class F(S, D):
pass
verify(F.__dynamic__ == 1)
try:
S.foo = 1
except (AttributeError, TypeError):
pass
else:
verify(0, "assignment to a static class attribute should be illegal")
D.foo = 1
verify(D.foo == 1)
# Test that dynamic attributes are inherited
verify(E.foo == 1)
verify(F.foo == 1)
class SS(D):
__dynamic__ = 0
verify(SS.__dynamic__ == 0)
verify(SS.foo == 1)
try:
SS.foo = 1
except (AttributeError, TypeError):
pass
else:
verify(0, "assignment to SS.foo should be illegal")
def errors():
if verbose: print "Testing errors..."
try:
class C(list, dictionary):
pass
except TypeError:
pass
else:
verify(0, "inheritance from both list and dict should be illegal")
try:
class C(object, None):
pass
except TypeError:
pass
else:
verify(0, "inheritance from non-type should be illegal")
class Classic:
pass
try:
class C(object, Classic):
pass
except TypeError:
pass
else:
verify(0, "inheritance from object and Classic should be illegal")
try:
class C(int):
pass
except TypeError:
pass
else:
verify(0, "inheritance from int should be illegal")
try:
class C(object):
__slots__ = 1
except TypeError:
pass
else:
verify(0, "__slots__ = 1 should be illegal")
try:
class C(object):
__slots__ = [1]
except TypeError:
pass
else:
verify(0, "__slots__ = [1] should be illegal")
def classmethods():
if verbose: print "Testing class methods..."
class C(object):
def foo(*a): return a
goo = classmethod(foo)
c = C()
verify(C.goo(1) == (C, 1))
verify(c.goo(1) == (C, 1))
verify(c.foo(1) == (c, 1))
class D(C):
pass
d = D()
verify(D.goo(1) == (D, 1))
verify(d.goo(1) == (D, 1))
verify(d.foo(1) == (d, 1))
verify(D.foo(d, 1) == (d, 1))
def staticmethods():
if verbose: print "Testing static methods..."
class C(object):
def foo(*a): return a
goo = staticmethod(foo)
c = C()
verify(C.goo(1) == (1,))
verify(c.goo(1) == (1,))
verify(c.foo(1) == (c, 1,))
class D(C):
pass
d = D()
verify(D.goo(1) == (1,))
verify(d.goo(1) == (1,))
verify(d.foo(1) == (d, 1))
verify(D.foo(d, 1) == (d, 1))
def classic():
if verbose: print "Testing classic classes..."
class C:
def foo(*a): return a
goo = classmethod(foo)
c = C()
verify(C.goo(1) == (C, 1))
verify(c.goo(1) == (C, 1))
verify(c.foo(1) == (c, 1))
class D(C):
pass
d = D()
verify(D.goo(1) == (D, 1))
verify(d.goo(1) == (D, 1))
verify(d.foo(1) == (d, 1))
verify(D.foo(d, 1) == (d, 1))
def compattr():
if verbose: print "Testing computed attributes..."
class C(object):
class computed_attribute(object):
def __init__(self, get, set=None):
self.__get = get
self.__set = set
def __get__(self, obj, type=None):
return self.__get(obj)
def __set__(self, obj, value):
return self.__set(obj, value)
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
x = computed_attribute(__get_x, __set_x)
a = C()
verify(a.x == 0)
verify(a.x == 1)
a.x = 10
verify(a.x == 10)
verify(a.x == 11)
def newslot():
if verbose: print "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()
verify(a.foo == 3)
verify(a.__class__ is C)
class D(C):
pass
b = D()
verify(b.foo == 3)
verify(b.__class__ is D)
class PerverseMetaType(type):
def mro(cls):
L = type.mro(cls)
L.reverse()
return L
def altmro():
if verbose: print "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
verify(D.mro() == [D, B, C, A, object] == list(D.__mro__))
verify(D().f() == "C")
class X(A,B,C,D):
__metaclass__ = PerverseMetaType
verify(X.__mro__ == (object, A, C, B, D, X))
verify(X().f() == "A")
def overloading():
if verbose: print "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:
return B.__getattr__(self, name)
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
def __getslice__(self, i, j):
return ("getslice", i, j)
def __setslice__(self, i, j, value):
self.setslice = (i, j, value)
def __delslice__(self, i, j):
self.delslice = (i, j)
a = C()
verify(a.foo == ("getattr", "foo"))
a.foo = 12
verify(a.setattr == ("foo", 12))
del a.foo
verify(a.delattr == "foo")
verify(a[12] == ("getitem", 12))
a[12] = 21
verify(a.setitem == (12, 21))
del a[12]
verify(a.delitem == 12)
verify(a[0:10] == ("getslice", 0, 10))
a[0:10] = "foo"
verify(a.setslice == (0, 10, "foo"))
del a[0:10]
verify(a.delslice == (0, 10))
def all():
lists()
dicts()
ints()
longs()
floats()
complexes()
spamlists()
spamdicts()
pydicts()
pylists()
metaclass()
pymods()
multi()
diamond()
objects()
slots()
dynamics()
errors()
classmethods()
staticmethods()
classic()
compattr()
newslot()
altmro()
overloading()
all()
if verbose: print "All OK"