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argparse: allow_abbrev=False is ignored for alternative prefix characters #83727

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kyleam mannequin opened this issue Feb 3, 2020 · 4 comments
Closed

argparse: allow_abbrev=False is ignored for alternative prefix characters #83727

kyleam mannequin opened this issue Feb 3, 2020 · 4 comments
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3.8 only security fixes 3.9 only security fixes stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@kyleam
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kyleam mannequin commented Feb 3, 2020

BPO 39546
Nosy @rhettinger, @miss-islington, @shihai1991, @kyleam
PRs
  • bpo-39546: argparse: Honor allow_abbrev=False for specified prefix_chars #18337
  • [3.8] bpo-39546: argparse: Honor allow_abbrev=False for specified prefix_chars (GH-18337) #18543
    		•

    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 2020-03-03.16:30:56.744>
created_at = <Date 2020-02-03.20:11:28.709>
labels = ['3.8', 'type-bug', 'library', '3.9']
title = 'argparse: allow_abbrev=False is ignored for alternative prefix characters'
updated_at = <Date 2020-03-03.16:30:56.744>
user = 'https://github.com/kyleam'

    bugs.python.org fields:

    activity = <Date 2020-03-03.16:30:56.744>
actor = 'petr.viktorin'
assignee = 'none'
closed = True
closed_date = <Date 2020-03-03.16:30:56.744>
closer = 'petr.viktorin'
components = ['Library (Lib)']
creation = <Date 2020-02-03.20:11:28.709>
creator = 'kyleam'
dependencies = []
files = []
hgrepos = []
issue_num = 39546
keywords = ['patch']
message_count = 4.0
messages = ['361326', '361345', '362183', '362193']
nosy_count = 5.0
nosy_names = ['rhettinger', 'paul.j3', 'miss-islington', 'shihai1991', 'kyleam']
pr_nums = ['18337', '18543']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39546'
versions = ['Python 3.8', 'Python 3.9']
    @kyleam
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    kyleam mannequin commented Feb 3, 2020

    As of Python v3.8.0 (specifically commit b1e4d1b), specifying
    allow_abbrev=False does not disable abbreviation for prefix
    characters other than '-'.

    --8<---------------cut here---------------start------------->8---

    import argparse

parser = argparse.ArgumentParser(prefix_chars='+', allow_abbrev=False)
parser.add_argument('++long')
print(parser.parse_args(['++lo=val']))
--8<---------------cut here---------------end--------------->8

    Observed output (with b1e4d1b and current master):

        Namespace(long='val')

    Expected (and observed with b1e4d1b^ and 3.7.3):

    usage: scratch.py [+h] [++long LONG]
scratch.py: error: unrecognized arguments: ++lo=val

    I will follow up with a PR to propose a fix.

    @kyleam kyleam mannequin added 3.8 only security fixes 3.9 only security fixes stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error labels Feb 3, 2020
    @shihai1991
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    Good catch, it apprears in my python env(master base) too.

    @miss-islington
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    New changeset 8edfc47 by Kyle Meyer in branch 'master':
    bpo-39546: argparse: Honor allow_abbrev=False for specified prefix_chars (GH-18337)
    8edfc47

    @miss-islington
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    New changeset e412cbb by Miss Islington (bot) in branch '3.8':
    [3.8] bpo-39546: argparse: Honor allow_abbrev=False for specified prefix_chars (GH-18337) (GH-18543)
    e412cbb

    @encukou encukou closed this as completed Mar 3, 2020
    @encukou encukou closed this as completed Mar 3, 2020
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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