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Date: Fri, 1 May 2015 22:09:28 +1000
Subject: Re: ImportError with pickle (Python 2.7.9), possibly platform dependent
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:89725

On Fri, May 1, 2015 at 9:01 PM, Ben Sizer <kylotan@gmail.com> wrote:
> Another good question, and this gives us the answer. The module lists are=
 quite different, as I'd expect because the load happens in the context of =
the full application whereas the dump happens as a standalone script. But l=
iterally every module that is in the 'before dump' list is in the 'before l=
oad' list - except OMDBMap. Like the error says! What /is/ in the 'before l=
oad' list however is "my_wsgi_app.OMDBMap". The module has been imported, b=
ut the pickle algorithm is unable to reconcile the module in the WSGI app's=
 namespace with the module referenced in the pickle file.
>
> So... I don't know how to fix this, but I do now know why it fails, and I=
 have a satisfactory answer for why it is acting differently on the Linux s=
erver (and that is just because that is the only one running under WSGI). T=
wo out of three isn't bad!
>

Cool! That's part way. So, can you simply stuff OMDBMap into
sys.modules prior to loading? It might be a bit of a hack, but it
should work for testing, at least. Conversely, you could change the
dump script to import via the name my_wsgi_app to make it consistent.

ChrisA