The following sequence causes isinstance to raise an exception rather than to return False.

>>> class foo:
...     pass
... 
>>> import collections
>>> isinstance(foo,collections.Callable)
True
>>> isinstance(foo(),collections.Callable)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/abc.py", line 131, in __instancecheck__
    return (cls.__subclasscheck__(subclass) or
  File "/usr/lib/python2.6/abc.py", line 147, in __subclasscheck__
    ok = cls.__subclasshook__(subclass)
  File "/usr/lib/python2.6/_abcoll.py", line 117, in __subclasshook__
    if any("__call__" in B.__dict__ for B in C.__mro__):
AttributeError: class foo has no attribute '__mro__'
>>>

Confirmed with all others "isinstance(..., collections.Hashable)" and similar.

According to the documentation, we might expect the same behavior as for new-style class.

Well the fix is easy for old-style classes, since we just have to use hasattr(obj, '__call__') in that case.

Wow, critical issue, are you sure?

Here is the patch, with tests.
IMO, the tests may be ported to 3.x.

"subtype == _InstanceType" can probably be replaced with "subtype is _InstanceType". Otherwise, the patch looks good to me.

fixed

Fixed in r78800.
Additional tests backported to 3.x.