Obtain current module after it's been overwritten in sys.modules?

Asked Mar 06 '17 at 18:23

Active Mar 06 '17 at 18:45

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I have a script I'm trying to run from the command line:

import ipdb
def f(): pass
import pickle
pickle.dumps(f)

This is of course simplified. In reality I'm trying to use f in a multiprocessing.Pool, hence the need to pickle it. With ipython 5.3.0 and ipdb 0.10.2 this yields:

PicklingError: Can't pickle <function f at 0x1071eaaa0>: it's not found as __main__.f

I believe this is because IPython is overwriting sys.modules['__main__'] as described here.

I'd like to work around this problem. One idea I had was to replace sys.modules['__main__'] with the current module. I could obtain this reference before importing ipdb, but I'd like to avoid that (for rather involved reasons beyond the scope of this question).

Is it possible to get a reference to the current module after it's been overwritten in sys.modules? I see that I can get its name (__main__ in my case) but I don't see how to get its value (other than by looking in sys.modules).

edited Mar 06 '17 at 18:45

martineau

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asked Mar 06 '17 at 18:23

nonagon

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Perhaps a cleaner work-around is to make a separate module? – juanpa.arrivillaga Mar 06 '17 at 18:29
True, I think that would work. In my case I need it to be a single file that's run as a script from the command line though. – nonagon Mar 07 '17 at 04:25

Obtain current module after it's been overwritten in sys.modules?

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