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When __getattr__ is implemented without also implementing __copy__ and __deepcopy__ trying to (deep)copy the class fails.
>>> import copy
>>> class foo():
... def __getattr__(self, attr):
... return None
...
>>> f = foo()
>>> copy(f)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: 'module' object is not callable
The copy module checks if a class has implemented __copy__ using hasattr:
if hasattr(x, '__copy__'):
 ...
An easy fix would be to use:
if getattr(x, '__copy__', None):
 ...
In Python 3 this change has already been made.