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SF #532767: isinstance(x, X) should work when x is a proxy for an X

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instance, as long as x.__class__ is X or a subclass thereof.
Did a little cleanup of PyObject_IsInstance() too.
This commit is contained in:
Guido van Rossum 2003-02-12 03:32:58 +00:00
parent 73019a6321
commit 03bc7d3c4d
3 changed files with 53 additions and 7 deletions
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30
Lib/test/test_descr.py
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@ -3735,7 +3735,8 @@ def dict_type_with_metaclass():
def meth_class_get():
# Full coverage of descrobject.c::classmethod_get()
if verbose: print "Testing __get__ method of METH_CLASS C methods..."
if verbose:
print "Testing __get__ method of METH_CLASS C methods..."
# Baseline
arg = [1, 2, 3]
res = {1: None, 2: None, 3: None}
@ -3772,6 +3773,32 @@ def meth_class_get():
else:
raise TestFailed, "shouldn't have allowed descr.__get__(None, int)"
def isinst_isclass():
if verbose:
print "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)
verify(isinstance(a, C)) # Baseline
verify(isinstance(pa, C)) # Test
# Test with a new-style class
class C(object):
pass
a = C()
pa = Proxy(a)
verify(isinstance(a, C)) # Baseline
verify(isinstance(pa, C)) # Test
def test_main():
do_this_first()
@ -3859,6 +3886,7 @@ def test_main():
subclass_right_op()
dict_type_with_metaclass()
meth_class_get()
isinst_isclass()
if verbose: print "All OK"