Have argparse provide ability to require a fallback value be present

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
cli

Research direction

Read fallback.py for the reported use case, then inspect argparse-wip-1.patch and example.py to understand the proposed argparse behavior. Confirm the expected fallback requirement and add the missing tests indicated by the issue's “test needed” status; done means argparse enforces the required fallback behavior.

Written by the indexing model from the issue text.

Description

stdlib type-feature
BPO 26394
Files
  • fallback.py: use case
  • argparse-wip-1.patch
  • example.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 = None
created_at = <Date 2016-02-20.16:17:11.930>
labels = ['type-feature', 'library']
title = 'Have argparse provide ability to require a fallback value be present'
updated_at = <Date 2020-11-04.21:40:56.372>
user = 'https://bugs.python.org/quabla'

    bugs.python.org fields:

    activity = <Date 2020-11-04.21:40:56.372>
actor = 'brett.cannon'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2016-02-20.16:17:11.930>
creator = 'quabla'
dependencies = []
files = ['41984', '42061', '42062']
hgrepos = []
issue_num = 26394
keywords = ['patch']
message_count = 11.0
messages = ['260568', '260572', '260611', '261123', '261537', '261540', '261541', '261568', '261585', '261599', '294665']
nosy_count = 3.0
nosy_names = ['bethard', 'paul.j3', 'quabla']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue26394'
versions = ['Python 3.5']

    Dominant language
    Python
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