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Created on 2011-01-22 12:49 by david.caro, last changed 2022-04-11 14:57 by admin. This issue is now closed.
| Messages (4) | |||
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| msg126833 - (view) | Author: David Caro (david.caro) | Date: 2011-01-22 12:49 | |
When parsing option like --optionname, --option will match it too
example:
>>> import argparse
>>> parser = argparse.ArgumentParser()
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('--superstring')
_StoreAction(option_strings=['--superstring'], dest='superstring', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.parse_args(['--super','value'])
Namespace(superstring='value')
I'm using argparse 1.1 with python 2.6.6 (r266:84292, Sep 15 2010, 15:52:39), on ubuntu 10.10 32bit
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| msg126841 - (view) | Author: David Caro (david.caro) | Date: 2011-01-22 15:02 | |
It is not an issue, it will try to match all the optional parameters, and if only one matches, then it will use it:
2110 elif option_string.startswith(option_prefix):
2111 action = self._option_string_actions[option_string]
2112 tup = action, option_string, explicit_arg
2113 result.append(tup)
and
2057 # if exactly one action matched, this segmentation is good,
2058 # so return the parsed action
2059 elif len(option_tuples) == 1:
2060 option_tuple, = option_tuples
2061 return option_tuple
if you try to add more than one optional parameter that matches the substring, it will complain:
>>> import argparse
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('--superstring')
_StoreAction(option_strings=['--superstring'], dest='superstring', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.parse_args(['--super','value'])
Namespace(superstring='value')
>>> parser.add_argument('--superstring2')
_StoreAction(option_strings=['--superstring'], dest='superstring', nargs=None, const=None, default=None, type=None, choices=None, help=None, metavar=None)
>>> parser.parse_args(['--super','value'])
usage: [-h] [--superstring SUPERSTRING] [--superstring2 SUPERSTRING2]
: error: ambiguous option: --super could match --superstring, --superstring2
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| msg127151 - (view) | Author: Éric Araujo (eric.araujo) *  |
Date: 2011-01-26 22:43 | |
Is this behavior documented? |
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| msg127155 - (view) | Author: David Caro (david.caro) | Date: 2011-01-26 23:22 | |
Yes it is, here http://docs.python.org/dev/library/argparse.html#argument-abbreviations. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:57:11 | admin | set | github: 55190 |
| 2011-01-26 23:22:52 | david.caro | set | messages: + msg127155 |
| 2011-01-26 22:43:14 | eric.araujo | set | nosy:
+ eric.araujo messages: + msg127151 versions: + Python 2.7, Python 3.2, - Python 2.6 |
| 2011-01-22 15:02:47 | david.caro | set | status: open -> closed messages: + msg126841 resolution: not a bug |
| 2011-01-22 12:53:12 | david.caro | set | title: options starting with -- match substrings -> argparse: options starting with -- match substrings |
| 2011-01-22 12:51:01 | david.caro | set | components:
+ Extension Modules versions: + Python 2.6 |
| 2011-01-22 12:49:08 | david.caro | create | |