[issue1877] unhelpful error when calling "python <dirname>"

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

Nick,

I understand the __main__.py issue now, but I still don't like your 
approach.  Allowing RunMainFromImporter to call exit and never return 
does not feel right. (A minor problem is that objects on the C stack do 
not get deleted.)  Without a check for Py_None return, the comment 
"argv0 is usable as an import source" is misleading.

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<http://bugs.python.org/issue1877>
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