test_copyreg: importing numpy changes warnings filters

[vstinner]

BPO	41003
Nosy	@vstinner
PRs	bpo-41003: Fix test_copyreg when numpy is installed #20935 [3.9] bpo-41003: Fix test_copyreg when numpy is installed (GH-20935) #20945 [3.8] bpo-41003: Fix test_copyreg when numpy is installed (GH-20935) (GH-20945) #20946

^{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 2020-06-17.17:10:24.066>
created_at = <Date 2020-06-17.12:45:57.267>
labels = ['3.8', 'tests', '3.9', '3.10']
title = 'test_copyreg: importing numpy changes warnings filters'
updated_at = <Date 2020-06-17.17:10:24.065>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-06-17.17:10:24.065>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-06-17.17:10:24.066>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2020-06-17.12:45:57.267>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 41003
keywords = ['patch']
message_count = 5.0
messages = ['371736', '371737', '371756', '371760', '371764']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['20935', '20945', '20946']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue41003'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[vstinner]

This issue is similar to bpo-40055: running test_copyreg fails with ENV_CHANGED if numpy is available. Example:

$ ./python -m venv env
$ env/bin/python -m pip install numpy
$ env/bin/python -m test --fail-env-changed -v test_copyreg -m xxxx
== CPython 3.9.0b3+ (heads/getpath_platlibdir39:11462e9847, Jun 11 2020, 17:49:13) [GCC 10.1.1 20200507 (Red Hat 10.1.1-1)]
(...)
Warning -- warnings.filters was modified by test_copyreg
  Before: (140498488250848, [], [])
  After:  (140498488250848, [], [('ignore', re.compile('numpy.ndarray size changed', re.IGNORECASE), <class 'Warning'>, None, 0), ('ignore', re.compile('numpy.ufunc size changed', re.IGNORECASE), <class 'Warning'>, None, 0), ('ignore', re.compile('numpy.dtype size changed', re.IGNORECASE), <class 'Warning'>, None, 0), ('always', None, <class 'numpy.RankWarning'>, None, 0)]) 
(...)

[vstinner]

The issue can be replaced by a fake numpy module:

$ cat Lib/numpy.py 
import warnings
warnings.simplefilter('ignore', UserWarning)

[vstinner]

New changeset 8362893 by Victor Stinner in branch 'master':
bpo-41003: Fix test_copyreg when numpy is installed (GH-20935)
8362893

[vstinner]

New changeset b39d41b by Victor Stinner in branch '3.9':
bpo-41003: Fix test_copyreg when numpy is installed (GH-20935) (GH-20945)
b39d41b

[vstinner]

New changeset 3d974b2 by Victor Stinner in branch '3.8':
bpo-41003: Fix test_copyreg when numpy is installed (GH-20935) (GH-20945) (GH-20946)
3d974b2