Allow translating argparse error messages

[DjMorgul]

BPO	39464
Nosy	@rhettinger, @shihai1991, @DjMorgul, @iritkatriel
PRs	bpo-39464: Allow translating argument error messages  #17169

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

Show more details

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-01-27.13:55:37.792>
labels = ['type-feature', 'library', '3.9', '3.10', '3.11']
title = 'Allow translating argparse error messages'
updated_at = <Date 2021-12-14.16:22:47.266>
user = 'https://github.com/DjMorgul'

bugs.python.org fields:

activity = <Date 2021-12-14.16:22:47.266>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-01-27.13:55:37.792>
creator = 'DjMorgul'
dependencies = []
files = []
hgrepos = []
issue_num = 39464
keywords = []
message_count = 4.0
messages = ['360764', '361156', '361157', '408545']
nosy_count = 5.0
nosy_names = ['rhettinger', 'paul.j3', 'shihai1991', 'DjMorgul', 'iritkatriel']
pr_nums = ['17169']
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39464'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[DjMorgul]

Argument error messages display the untranslatable text 'argument ', which should be translatable to other languages, just like it's possible to do with the rest of the constructed error message.

[shihai1991]

Paste José's comment from PR17169:

This message isn't used (only?) in exceptions... it's a message that is given to the console, to notify the user when she didn't provide correct parameters. For example:

$ python3 ./drt.py -l
Uso: ./drt.py [-h] [-l LONG_MIN] [-L LONG_MAX] [-v] [-V]
               entrada.json [salida.tok]
./drt.py: error: argument -l/--min-length: se esperaba un parámetro

These are console messages localized into Spanish. The "error:" part is translatable, but it's the same word in Spanish than in English. The "argument" part is what isn't translatable, and it's taken from this "exception".

I confirmed that my proposed patch, translating that particular string, allows giving a fully localized console output to the user in Spanish, such as:

./drt.py: error: parámetro -l/--min-length: se esperaba un parámetro

[shihai1991]

Users interact with console's output, so translated the output info is fine to me.
Hi，raymond、paul. What's your opinion?

[iritkatriel]

Closed bpo-26726 as duplicate of this.