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From issue4197:
"""
runpy needs a non-standard PEP 302 extension to set __file__ correctly
in the modules it runs. The pkgutil stuff it uses to find pure Python
modules in the filesystem supports that extension, but zipimport doesn't
(yet).
""" -- Nick Coghlan
I am working on a patch.

I have attached a rough patch implementing the get_filename. I 
deliberately copied code from get_source method that finds the filename 
inside the zip archive and simply prefixed that with the archive path.
I could not find any detailed discussion of what get_filename is 
supposed to do. Pkgutil's get_filename is not documented and not unit-
tested. Google search revealed an old thread at 
<http://mail.python.org/pipermail/python-dev/2006-April/063626.html>, 
but it only says
"""
>runpy needs a get_filename() method, so it knows what to set __file__ 
too -
>currently its emulation supports that, but it isn't officially part of 
the 
>PEP
>302 API.
It sounds like maybe a new PEP is needed to document all the extensions 
to 
the importer/loader protocols. :(
"""
I don't think a brand new PEP is needed, but an amendment to PEP 302 
would be helpful. Nick, do you have any notes on what get_filename 
should do in various cases?
My implementation fixes one of the problems in issue4197:
$ ./python.exe testmodule.zip 
**********************************************************************
File "testmodule.zip/__main__.py", line ?, in __main__.c
Failed example:
 'line 2'
Expected nothing
Got:
 'line 2'
**********************************************************************
1 items had failures:
 1 of 1 in __main__.c
***Test Failed*** 1 failures.
Note that line number is still reported as '?', but there is no crash.

The spec get_filename is pretty simple:
Return whatever __file__ would be set to if load_module() was called for
this module.
(runpy's problem is that it never actually loads the module in question,
so it never gets the chance to interrogate __file__)

Fixed for 2.7 in r67750.
Will be ported to 2.6, 3.0 and 3.1.

Correction - added as _get_filename() in that revision.
Documenting it and making it public (i.e. removing the underscore) is
still to be done, and will only be done for 2.7/3.1

ZipImporter.get_filename() made public in:
2.7: r69425
3.1: r69426