Richard Oudkerk added the comment:
When pickling a class (or instance of a class) there is already a check
that the invariant
getattr(sys.modules[cls.__module__], cls.__name__) == cls
holds.
>>> import pickle
>>> class A: pass
...
>>> A.__module__ = 'nonexistent'
>>> pickle.dumps(A())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
_pickle.PicklingError: Can't pickle <class 'nonexistent.A'>: import of
module 'nonexistent' failed
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<http://bugs.python.org/issue17941>
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