argparse does not accept options taking arguments beginning with dash (regression from optparse)

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@serhiy-storchaka is already working on this.

Since Aug 22, 2025.

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Description

stdlib type-feature
BPO 9334
Nosy @rhettinger, @cben, @ericvsmith, @orivej, @merwok, @bitdancer, @andersk, @vadmium, @spaceone, @vporton, @maggyero, @tirkarthi, @gaborbernat
Files
  • final.patch: patch for issue 9334
  • python-argparse-error.patch
  • argparse_opt.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 = None
closed_at = <Date 2021-12-26.23:41:14.505>
created_at = <Date 2010-07-22.22:15:36.970>
labels = ['3.7', 'type-feature', 'library']
title = 'argparse does not accept options taking arguments beginning with dash (regression from optparse)'
updated_at = <Date 2022-01-12.23:59:10.962>
user = 'https://github.com/andersk'

    bugs.python.org fields:

    activity = <Date 2022-01-12.23:59:10.962>
actor = 'andersk'
assignee = 'none'
closed = True
closed_date = <Date 2021-12-26.23:41:14.505>
closer = 'rhettinger'
components = ['Library (Lib)']
creation = <Date 2010-07-22.22:15:36.970>
creator = 'andersk'
dependencies = []
files = ['29548', '47302', '47404']
hgrepos = []
issue_num = 9334
keywords = ['patch']
message_count = 71.0
messages = ['111221', '111224', '111227', '111228', '111230', '111279', '111367', '111669', '111670', '111673', '111691', '128014', '128025', '128047', '128055', '128062', '128071', '128072', '128076', '128078', '128090', '128091', '128094', '128104', '128134', '128179', '128266', '128728', '132220', '132260', '150310', '150320', '169712', '169978', '184174', '184177', '184178', '184180', '184211', '184425', '184987', '239435', '251815', '251862', '263211', '263216', '276486', '276503', '276524', '276634', '307193', '307209', '307210', '307213', '307786', '309685', '309691', '309693', '310540', '322678', '331729', '331732', '331736', '404229', '409125', '409221', '409222', '409223', '409225', '409227', '410445']
nosy_count = 31.0
nosy_names = ['rhettinger', 'cben', 'amcnabb', 'bethard', 'eric.smith', 'orivej', 'eric.araujo', 'r.david.murray', 'memeplex', 'gfxmonk', 'evaned', 'andersk', 'abacabadabacaba', 'gdb', 'nelhage', 'drm', 'davidben', 'martin.panter', 'paul.j3', 'skilletaudio', 'Christophe.Guillon', 'danielsh', 'spaceone', 'Clint Olsen', 'porton', 'Socob', 'maggyero', 'karzes', 'xtreak', 'fennec15', 'gaborjbernat']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue9334'
versions = ['Python 3.7']

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