attempt to access sys.argv when it doesn\'t exist

[vimboss]

BPO	839151
Nosy	@birkenfeld, @birkenfeld
Files	diff: patch for warnings.py

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/birkenfeld'
closed_at = <Date 2007-08-22.01:29:11.000>
created_at = <Date 2003-11-10.10:56:09.000>
labels = ['library']
title = "attempt to access sys.argv when it doesn\\'t exist"
updated_at = <Date 2007-08-22.01:29:11.000>
user = 'https://bugs.python.org/vimboss'

bugs.python.org fields:

activity = <Date 2007-08-22.01:29:11.000>
actor = 'ngrover'
assignee = 'georg.brandl'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2003-11-10.10:56:09.000>
creator = 'vimboss'
dependencies = []
files = ['1090']
hgrepos = []
issue_num = 839151
keywords = []
message_count = 6.0
messages = ['18953', '18954', '18955', '18956', '18957', '18958']
nosy_count = 6.0
nosy_names = ['nobody', 'nnorwitz', 'georg.brandl', 'georg.brandl', 'vimboss', 'ngrover']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue839151'
versions = ['Python 2.3']

[vimboss]

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.

[nnorwitz]

Logged In: YES
user_id=33168

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

[nobody]

Logged In: NO

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'

[nobody]

Logged In: NO

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'

[birkenfeld]

Logged In: YES
user_id=1188172

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

[ngrover]

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.