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argparse docs: Positional * argument in mutually exclusive group requires a default parameter #70423
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| BPO | 26235 |
|---|
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GitHub fields:
assignee = None
closed_at = None
created_at = <Date 2016-01-29.00:16:38.018>
labels = ['docs']
title = 'argparse docs: Positional * argument in mutually exclusive group requires a default parameter'
updated_at = <Date 2016-01-30.02:42:42.063>
user = 'https://bugs.python.org/paulj3'bugs.python.org fields:
activity = <Date 2016-01-30.02:42:42.063>
actor = 'terry.reedy'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2016-01-29.00:16:38.018>
creator = 'paul.j3'
dependencies = []
files = []
hgrepos = []
issue_num = 26235
keywords = []
message_count = 1.0
messages = ['259179']
nosy_count = 3.0
nosy_names = ['bethard', 'docs@python', 'paul.j3']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue26235'
versions = ['Python 3.6']
Activity
paulj3 commentedon Jan 29, 2016
The documentation for Mutual exclusion
https://docs.python.org/3/library/argparse.html#mutual-exclusion
needs a note that a mutually exclusive group may contain one positional argument. But that argument must be either nargs='?', or nargs='*'. If '*' it must also have a default parameter (other than None).
(this issue came up recently on stackoverflow. It may have also been raised in the past as a bug/issue, but I don't have time at moment to search. I had to search through several layers of code to remember all the details.)
http://stackoverflow.com/questions/35044288/how-can-i-create-an-argparse-mutually-exclusive-group-with-multiple-positional-p
serhiy-storchaka commentedon Sep 26, 2024
It was changed in #124306.