Doc for `-X dev` option should mention PYTHONDEVMODE

[pitrou]

BPO	39712
Nosy	@pitrou, @vstinner, @ezio-melotti, @merwok, @willingc, @JulienPalard, @tirkarthi, @erlend-aasland, @rahul-kumi
PRs	bpo-39712: Cross reference env. vars and -X command line options #18685
Files	0001-bpo-39712.patch 0001-3.8-bpo-39712.patch 0001-3.7-bpo-39712.patch

^{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 2020-02-21.16:57:39.490>
labels = ['easy', '3.7', '3.8', '3.9', 'type-feature', 'docs']
title = 'Doc for `-X dev` option should mention PYTHONDEVMODE'
updated_at = <Date 2020-02-29.23:00:44.564>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2020-02-29.23:00:44.564>
actor = 'erlendaasland'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2020-02-21.16:57:39.490>
creator = 'pitrou'
dependencies = []
files = ['48926', '48927', '48928']
hgrepos = []
issue_num = 39712
keywords = ['patch', 'easy', 'newcomer friendly']
message_count = 4.0
messages = ['362414', '362525', '363025', '363030']
nosy_count = 10.0
nosy_names = ['pitrou', 'vstinner', 'ezio.melotti', 'eric.araujo', 'docs@python', 'willingc', 'mdk', 'xtreak', 'erlendaasland', 'rahul-kumi']
pr_nums = ['18685']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39712'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

Linked PRs

• GH-83893: Cross reference env. vars and -X command line options #103414
• [3.11] GH-83893: Cross reference env. vars and -X command line options (GH-103414) #103467

[pitrou]

In the doc for -X options (https://docs.python.org/3/using/cmdline.html#id5), when an option can be triggered through an equivalent environment variable, that variable is mentioned.

An exception to that is -X dev, which can also be triggered by the PYTHONDEVMODE variable, but that isn't mentioned in the CLI doc.

Other missing environment variables in the CLI doc are PYTHONFAULTHANDLER and PYTHONTRACEMALLOC.