Python’s inability to pickle module objects is the real problem. Is there a good reason? I don’t think so. Having module objects unpicklable contributes to the frailty of python as a parallel / asynchronous language. If you want to pickle module objects, or almost anything in python, then use dill.
Python 3.2.5 (default, May 19 2013, 14:25:55)
[GCC 4.2.1 Compatible Apple Clang 4.1 ((tags/Apple/clang-421.11.66))] on darwin
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>>> import dill
>>> import os
>>> dill.dumps(os)
b'\x80\x03cdill.dill\n_import_module\nq\x00X\x02\x00\x00\x00osq\x01\x85q\x02Rq\x03.'
>>>
>>>
>>> # and for parlor tricks...
>>> class Foo(object):
... x = 100
... def __call__(self, f):
... def bar(y):
... return f(self.x) + y
... return bar
...
>>> @Foo()
... def do_thing(x):
... return x
...
>>> do_thing(3)
103
>>> dill.loads(dill.dumps(do_thing))(3)
103
>>>
Get dill here: https://github.com/uqfoundation/dill