mirror of https://github.com/python/cpython
287 lines
9.4 KiB
Python
287 lines
9.4 KiB
Python
import functools
|
|
import unittest
|
|
from test import test_support
|
|
from weakref import proxy
|
|
|
|
@staticmethod
|
|
def PythonPartial(func, *args, **keywords):
|
|
'Pure Python approximation of partial()'
|
|
def newfunc(*fargs, **fkeywords):
|
|
newkeywords = keywords.copy()
|
|
newkeywords.update(fkeywords)
|
|
return func(*(args + fargs), **newkeywords)
|
|
newfunc.func = func
|
|
newfunc.args = args
|
|
newfunc.keywords = keywords
|
|
return newfunc
|
|
|
|
def capture(*args, **kw):
|
|
"""capture all positional and keyword arguments"""
|
|
return args, kw
|
|
|
|
class TestPartial(unittest.TestCase):
|
|
|
|
thetype = functools.partial
|
|
|
|
def test_basic_examples(self):
|
|
p = self.thetype(capture, 1, 2, a=10, b=20)
|
|
self.assertEqual(p(3, 4, b=30, c=40),
|
|
((1, 2, 3, 4), dict(a=10, b=30, c=40)))
|
|
p = self.thetype(map, lambda x: x*10)
|
|
self.assertEqual(p([1,2,3,4]), [10, 20, 30, 40])
|
|
|
|
def test_attributes(self):
|
|
p = self.thetype(capture, 1, 2, a=10, b=20)
|
|
# attributes should be readable
|
|
self.assertEqual(p.func, capture)
|
|
self.assertEqual(p.args, (1, 2))
|
|
self.assertEqual(p.keywords, dict(a=10, b=20))
|
|
# attributes should not be writable
|
|
if not isinstance(self.thetype, type):
|
|
return
|
|
self.assertRaises(TypeError, setattr, p, 'func', map)
|
|
self.assertRaises(TypeError, setattr, p, 'args', (1, 2))
|
|
self.assertRaises(TypeError, setattr, p, 'keywords', dict(a=1, b=2))
|
|
|
|
def test_argument_checking(self):
|
|
self.assertRaises(TypeError, self.thetype) # need at least a func arg
|
|
try:
|
|
self.thetype(2)()
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
self.fail('First arg not checked for callability')
|
|
|
|
def test_protection_of_callers_dict_argument(self):
|
|
# a caller's dictionary should not be altered by partial
|
|
def func(a=10, b=20):
|
|
return a
|
|
d = {'a':3}
|
|
p = self.thetype(func, a=5)
|
|
self.assertEqual(p(**d), 3)
|
|
self.assertEqual(d, {'a':3})
|
|
p(b=7)
|
|
self.assertEqual(d, {'a':3})
|
|
|
|
def test_arg_combinations(self):
|
|
# exercise special code paths for zero args in either partial
|
|
# object or the caller
|
|
p = self.thetype(capture)
|
|
self.assertEqual(p(), ((), {}))
|
|
self.assertEqual(p(1,2), ((1,2), {}))
|
|
p = self.thetype(capture, 1, 2)
|
|
self.assertEqual(p(), ((1,2), {}))
|
|
self.assertEqual(p(3,4), ((1,2,3,4), {}))
|
|
|
|
def test_kw_combinations(self):
|
|
# exercise special code paths for no keyword args in
|
|
# either the partial object or the caller
|
|
p = self.thetype(capture)
|
|
self.assertEqual(p(), ((), {}))
|
|
self.assertEqual(p(a=1), ((), {'a':1}))
|
|
p = self.thetype(capture, a=1)
|
|
self.assertEqual(p(), ((), {'a':1}))
|
|
self.assertEqual(p(b=2), ((), {'a':1, 'b':2}))
|
|
# keyword args in the call override those in the partial object
|
|
self.assertEqual(p(a=3, b=2), ((), {'a':3, 'b':2}))
|
|
|
|
def test_positional(self):
|
|
# make sure positional arguments are captured correctly
|
|
for args in [(), (0,), (0,1), (0,1,2), (0,1,2,3)]:
|
|
p = self.thetype(capture, *args)
|
|
expected = args + ('x',)
|
|
got, empty = p('x')
|
|
self.failUnless(expected == got and empty == {})
|
|
|
|
def test_keyword(self):
|
|
# make sure keyword arguments are captured correctly
|
|
for a in ['a', 0, None, 3.5]:
|
|
p = self.thetype(capture, a=a)
|
|
expected = {'a':a,'x':None}
|
|
empty, got = p(x=None)
|
|
self.failUnless(expected == got and empty == ())
|
|
|
|
def test_no_side_effects(self):
|
|
# make sure there are no side effects that affect subsequent calls
|
|
p = self.thetype(capture, 0, a=1)
|
|
args1, kw1 = p(1, b=2)
|
|
self.failUnless(args1 == (0,1) and kw1 == {'a':1,'b':2})
|
|
args2, kw2 = p()
|
|
self.failUnless(args2 == (0,) and kw2 == {'a':1})
|
|
|
|
def test_error_propagation(self):
|
|
def f(x, y):
|
|
x / y
|
|
self.assertRaises(ZeroDivisionError, self.thetype(f, 1, 0))
|
|
self.assertRaises(ZeroDivisionError, self.thetype(f, 1), 0)
|
|
self.assertRaises(ZeroDivisionError, self.thetype(f), 1, 0)
|
|
self.assertRaises(ZeroDivisionError, self.thetype(f, y=0), 1)
|
|
|
|
def test_attributes(self):
|
|
p = self.thetype(hex)
|
|
try:
|
|
del p.__dict__
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
self.fail('partial object allowed __dict__ to be deleted')
|
|
|
|
def test_weakref(self):
|
|
f = self.thetype(int, base=16)
|
|
p = proxy(f)
|
|
self.assertEqual(f.func, p.func)
|
|
f = None
|
|
self.assertRaises(ReferenceError, getattr, p, 'func')
|
|
|
|
def test_with_bound_and_unbound_methods(self):
|
|
data = map(str, range(10))
|
|
join = self.thetype(str.join, '')
|
|
self.assertEqual(join(data), '0123456789')
|
|
join = self.thetype(''.join)
|
|
self.assertEqual(join(data), '0123456789')
|
|
|
|
class PartialSubclass(functools.partial):
|
|
pass
|
|
|
|
class TestPartialSubclass(TestPartial):
|
|
|
|
thetype = PartialSubclass
|
|
|
|
|
|
class TestPythonPartial(TestPartial):
|
|
|
|
thetype = PythonPartial
|
|
|
|
class TestUpdateWrapper(unittest.TestCase):
|
|
|
|
def check_wrapper(self, wrapper, wrapped,
|
|
assigned=functools.WRAPPER_ASSIGNMENTS,
|
|
updated=functools.WRAPPER_UPDATES):
|
|
# Check attributes were assigned
|
|
for name in assigned:
|
|
self.failUnless(getattr(wrapper, name) is getattr(wrapped, name))
|
|
# Check attributes were updated
|
|
for name in updated:
|
|
wrapper_attr = getattr(wrapper, name)
|
|
wrapped_attr = getattr(wrapped, name)
|
|
for key in wrapped_attr:
|
|
self.failUnless(wrapped_attr[key] is wrapper_attr[key])
|
|
|
|
def test_default_update(self):
|
|
def f():
|
|
"""This is a test"""
|
|
pass
|
|
f.attr = 'This is also a test'
|
|
def wrapper():
|
|
pass
|
|
functools.update_wrapper(wrapper, f)
|
|
self.check_wrapper(wrapper, f)
|
|
self.assertEqual(wrapper.__name__, 'f')
|
|
self.assertEqual(wrapper.__doc__, 'This is a test')
|
|
self.assertEqual(wrapper.attr, 'This is also a test')
|
|
|
|
def test_no_update(self):
|
|
def f():
|
|
"""This is a test"""
|
|
pass
|
|
f.attr = 'This is also a test'
|
|
def wrapper():
|
|
pass
|
|
functools.update_wrapper(wrapper, f, (), ())
|
|
self.check_wrapper(wrapper, f, (), ())
|
|
self.assertEqual(wrapper.__name__, 'wrapper')
|
|
self.assertEqual(wrapper.__doc__, None)
|
|
self.failIf(hasattr(wrapper, 'attr'))
|
|
|
|
def test_selective_update(self):
|
|
def f():
|
|
pass
|
|
f.attr = 'This is a different test'
|
|
f.dict_attr = dict(a=1, b=2, c=3)
|
|
def wrapper():
|
|
pass
|
|
wrapper.dict_attr = {}
|
|
assign = ('attr',)
|
|
update = ('dict_attr',)
|
|
functools.update_wrapper(wrapper, f, assign, update)
|
|
self.check_wrapper(wrapper, f, assign, update)
|
|
self.assertEqual(wrapper.__name__, 'wrapper')
|
|
self.assertEqual(wrapper.__doc__, None)
|
|
self.assertEqual(wrapper.attr, 'This is a different test')
|
|
self.assertEqual(wrapper.dict_attr, f.dict_attr)
|
|
|
|
|
|
class TestWraps(TestUpdateWrapper):
|
|
|
|
def test_default_update(self):
|
|
def f():
|
|
"""This is a test"""
|
|
pass
|
|
f.attr = 'This is also a test'
|
|
@functools.wraps(f)
|
|
def wrapper():
|
|
pass
|
|
self.check_wrapper(wrapper, f)
|
|
self.assertEqual(wrapper.__name__, 'f')
|
|
self.assertEqual(wrapper.__doc__, 'This is a test')
|
|
self.assertEqual(wrapper.attr, 'This is also a test')
|
|
|
|
def test_no_update(self):
|
|
def f():
|
|
"""This is a test"""
|
|
pass
|
|
f.attr = 'This is also a test'
|
|
@functools.wraps(f, (), ())
|
|
def wrapper():
|
|
pass
|
|
self.check_wrapper(wrapper, f, (), ())
|
|
self.assertEqual(wrapper.__name__, 'wrapper')
|
|
self.assertEqual(wrapper.__doc__, None)
|
|
self.failIf(hasattr(wrapper, 'attr'))
|
|
|
|
def test_selective_update(self):
|
|
def f():
|
|
pass
|
|
f.attr = 'This is a different test'
|
|
f.dict_attr = dict(a=1, b=2, c=3)
|
|
def add_dict_attr(f):
|
|
f.dict_attr = {}
|
|
return f
|
|
assign = ('attr',)
|
|
update = ('dict_attr',)
|
|
@functools.wraps(f, assign, update)
|
|
@add_dict_attr
|
|
def wrapper():
|
|
pass
|
|
self.check_wrapper(wrapper, f, assign, update)
|
|
self.assertEqual(wrapper.__name__, 'wrapper')
|
|
self.assertEqual(wrapper.__doc__, None)
|
|
self.assertEqual(wrapper.attr, 'This is a different test')
|
|
self.assertEqual(wrapper.dict_attr, f.dict_attr)
|
|
|
|
|
|
|
|
def test_main(verbose=None):
|
|
import sys
|
|
test_classes = (
|
|
TestPartial,
|
|
TestPartialSubclass,
|
|
TestPythonPartial,
|
|
TestUpdateWrapper,
|
|
TestWraps
|
|
)
|
|
test_support.run_unittest(*test_classes)
|
|
|
|
# verify reference counting
|
|
if verbose and hasattr(sys, "gettotalrefcount"):
|
|
import gc
|
|
counts = [None] * 5
|
|
for i in xrange(len(counts)):
|
|
test_support.run_unittest(*test_classes)
|
|
gc.collect()
|
|
counts[i] = sys.gettotalrefcount()
|
|
print counts
|
|
|
|
if __name__ == '__main__':
|
|
test_main(verbose=True)
|