New submission from Ram Rachum <cool...@cool-rr.com>:
>>> import abc
>>> class A(object, metaclass=abc.ABCMeta):
... pass
>>> issubclass([], A)
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
issubclass([], A)
File "c:\Python32\lib\abc.py", line 137, in __subclasscheck__
if subclass in cls._abc_cache:
File "c:\Python32\lib\_weakrefset.py", line 69, in __contains__
return ref(item) in self.data
TypeError: cannot create weak reference to 'list' object
I should be able to check whether an object is a subclass of something without
confirming it's a type first. I think this call should just return False.
----------
components: Library (Lib)
messages: 122736
nosy: cool-RR
priority: normal
severity: normal
status: open
title: abc: `issubclass([], my_abstract_type)` raises exception
type: behavior
versions: Python 3.2
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10569>
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