New submission from Jason Baker <[email protected]>:
This is referring to argparse 1.1 installed under Python 2.6. When I was
passing in an nargs flag, I figured that since '+' and '*' are valid options, I
should pass in strings. So when I tried passing in the string '1' instead of
the integer 1, I got the following error:
>>> import argparse
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('foo', nargs='1')
_StoreAction(option_strings=[], dest='foo', nargs='1', const=None,
default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.parse_args()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "build/bdist.macosx-10.6-universal/egg/argparse.py", line 1698, in
parse_args
File "build/bdist.macosx-10.6-universal/egg/argparse.py", line 1730, in
parse_known_args
File "build/bdist.macosx-10.6-universal/egg/argparse.py", line 1935, in
_parse_known_args
File "build/bdist.macosx-10.6-universal/egg/argparse.py", line 1884, in
consume_positionals
File "build/bdist.macosx-10.6-universal/egg/argparse.py", line 2028, in
_match_arguments_partial
File "build/bdist.macosx-10.6-universal/egg/argparse.py", line 2169, in
_get_nargs_pattern
TypeError: can't multiply sequence by non-int of type 'str'
Fortunately, I had just added the nargs and knew to correct that. However, if
I were to do something like read that value in from a config file and forget to
coerce the value from a string to an int, I could see how this could be a giant
pain to track down.
----------
components: Library (Lib)
messages: 116355
nosy: Jason.Baker
priority: normal
severity: normal
status: open
title: Argparse needs better error handling for nargs
versions: Python 2.6
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Python tracker <[email protected]>
<http://bugs.python.org/issue9849>
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