Allow PYTHONTRACEMALLOC=0 and -X tracemalloc=0 to disable explicitly tracemalloc

[vstinner]

BPO	34228
Nosy	@vstinner
PRs	bpo-34228: Allow PYTHONTRACEMALLOC=0 #8467

^{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 2018-07-26.08:53:13.330>
created_at = <Date 2018-07-25.16:54:55.120>
labels = ['3.8', 'library']
title = 'Allow PYTHONTRACEMALLOC=0 and -X tracemalloc=0 to disable explicitly tracemalloc'
updated_at = <Date 2018-07-26.08:53:13.329>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2018-07-26.08:53:13.329>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2018-07-26.08:53:13.330>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2018-07-25.16:54:55.120>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 34228
keywords = ['patch']
message_count = 3.0
messages = ['322369', '322372', '322407']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['8467']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue34228'
versions = ['Python 3.8']

[vstinner]

Currently, -X tracemalloc=0 command line option is reject as an invalid value. I would like to allow to explicitly disable tracemalloc. That's useful to ignore the PYTHONTRACEMALLOC environment variable:

"PYTHONTRACEMALLOC=1 python3 -X tracemalloc=0" would not enable tracemalloc at startup.

[vstinner]

New changeset 60b04c9 by Victor Stinner in branch 'master':
bpo-34228: Allow PYTHONTRACEMALLOC=0 (GH-8467)
60b04c9

[vstinner]

I don't think that it's worth it to backport this change. It's really a corner case and it's almsot a bugfix. I mostly need it for testing _PyCoreConfig and Python initialisation.