New submission from Hartmut Niemann <hartmut.niem...@siemens.com>:
I run this script with option --help
-----8<------------------
import argparse
parser = argparse.ArgumentParser()
parser.add_argument ('--from-itm',
dest="from_itm",action="store",default=None,help ="Source ITM file",
metavar="ITMFILENAME")
parser.add_argument
("--from-fbm-sigtab",dest="from_sigtab",action="store",default=None,help="Source
signal FB", metavar=" [LIB,]FBNAME")
parser.add_argument ("--c",dest="f",metavar="x]d")
args = parser.parse_args()
---------8<--------------------
and I get an assertion failure:
---------8<--------------------
D:\temp>argparsebug.py --help
Traceback (most recent call last):
File "D:\temp\argparsebug.py", line 6, in <module>
args = parser.parse_args()
File "C:\Python27\lib\argparse.py", line 1678, in parse_args
args, argv = self.parse_known_args(args, namespace)
File "C:\Python27\lib\argparse.py", line 1710, in parse_known_args
namespace, args = self._parse_known_args(args, namespace)
File "C:\Python27\lib\argparse.py", line 1916, in _parse_known_args
start_index = consume_optional(start_index)
File "C:\Python27\lib\argparse.py", line 1856, in consume_optional
take_action(action, args, option_string)
File "C:\Python27\lib\argparse.py", line 1784, in take_action
action(self, namespace, argument_values, option_string)
File "C:\Python27\lib\argparse.py", line 993, in __call__
parser.print_help()
File "C:\Python27\lib\argparse.py", line 2303, in print_help
self._print_message(self.format_help(), file)
File "C:\Python27\lib\argparse.py", line 2277, in format_help
return formatter.format_help()
File "C:\Python27\lib\argparse.py", line 278, in format_help
help = self._root_section.format_help()
File "C:\Python27\lib\argparse.py", line 208, in format_help
func(*args)
File "C:\Python27\lib\argparse.py", line 329, in _format_usage
assert ' '.join(opt_parts) == opt_usage
AssertionError
--------------8<-------------------------------
It must be the combination of several argument lines because when I
comment out one of the add_arguments, it works.
Is this a bug or do I do things I shouln't?
If it is not allowed to use [] in metavars (what I wanted was
metavar='[optional,]mantatory'), I' like to receive a readable error message.
With best regards
Hartmut Niemann
----------
components: None
messages: 134021
nosy: htnieman
priority: normal
severity: normal
status: open
title: argparse assertion failure with brackets in metavars
type: behavior
versions: Python 2.7
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11874>
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