When using Python as an extension to another program,
giving a warning message attempts to access sys.argv
while it doesn't exist.

The problem can be reproduced with Vim when compiled
with Python 2.3.  Use these two commands:
    :py import sys
    :py print sys.maxint + 1

The problem is caused by the warnings module.  In line
53 it accesses sys.argv[0], but for an embedded
interpreter this doesn't exist.

The suggested fix does an explicit test for the
existence of sys.argv.  That seems to be the cleanest
solution to me.

This problem also existed in Python 2.2.  I didn't try
other versions.

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Just to provide a reference, 839200 was a duplicate of this
report.  I closed 839200.

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Much simplier test:

>>> import sys
>>> del sys.argv
>>> sys.maxint+1
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "D:\development\python22\lib\warnings.py", line 38,
in warn
    filename = sys.argv[0]
AttributeError: 'module' object has no attribute 'argv'

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Much simplier test:

>>> import sys
>>> del sys.argv
>>> sys.maxint+1
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "D:\development\python22\lib\warnings.py", line 38,
in warn
    filename = sys.argv[0]
AttributeError: 'module' object has no attribute 'argv'

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Thanks for the report; this is fixed as of Lib/warnings.py
r1.27, r1.24.2.2.

In addition to catching AttributeError in case sys.argv doesn't exist, this should also catch IndexError and TypeError in case sys.argv is an empty list or it is not even a list at all.