New submission from Glenn Linderman:
I coded up a new program, with a bunch of options, and got the following
traceback when I tried to run it:
Traceback (most recent call last):
File "D:\my\py\renmany.py", line 273, in <module>
args = cmdl.parse_intermixed_args()
File "D:\my\py\glu\glu.py", line 1695, in parse_intermixed_args
args, argv = self.parse_known_intermixed_args(args, namespace)
File "D:\my\py\glu\glu.py", line 1740, in parse_known_intermixed_args
namespace, remaining_args = self.parse_known_args(args, namespace)
File "C:\Python33\lib\argparse.py", line 1737, in parse_known_args
namespace, args = self._parse_known_args(args, namespace)
File "C:\Python33\lib\argparse.py", line 1943, in _parse_known_args
start_index = consume_optional(start_index)
File "C:\Python33\lib\argparse.py", line 1883, in consume_optional
take_action(action, args, option_string)
File "C:\Python33\lib\argparse.py", line 1811, in take_action
action(self, namespace, argument_values, option_string)
File "C:\Python33\lib\argparse.py", line 1015, in __call__
parser.print_help()
File "C:\Python33\lib\argparse.py", line 2339, in print_help
self._print_message(self.format_help(), file)
File "C:\Python33\lib\argparse.py", line 2323, in format_help
return formatter.format_help()
File "C:\Python33\lib\argparse.py", line 276, in format_help
help = self._root_section.format_help()
File "C:\Python33\lib\argparse.py", line 206, in format_help
func(*args)
File "C:\Python33\lib\argparse.py", line 206, in format_help
func(*args)
File "C:\Python33\lib\argparse.py", line 513, in _format_action
help_text = self._expand_help(action)
File "C:\Python33\lib\argparse.py", line 600, in _expand_help
return self._get_help_string(action) % params
ValueError: unsupported format character ')' (0x29) at index 673
The only thing I can tell is that something went wrong in ArgParse. I had
called a bunch of add_argument, and then a parse_known_args. I had passed
parameters to the program to get a help message, so that is what I expect
parse_known_args is trying to produce... and the call stack seems to confirm
that. I didn't intentionally pass a format character ')' anywhere, but there
are ')' characters in some of my help messages, so that is probably the source
of the problem.
No doubt I can reduce the problem space by judiciously commenting out things
until I can isolate the particular help message that is causing the failure (it
may be more than one as several are similar). But it seems like the exception
should include the name of the argument for which the failure occurred.
[OK, I isolated, and found a "%)" sequence in one of my messages that should
have been "%%)". So this is not terribly urgent, just poor reporting.]
----------
messages: 219778
nosy: v+python
priority: normal
severity: normal
status: open
title: Argparse exceptions should include which argument has a problem
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21666>
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