PEP 597: os.popen() uses locale encoding

[methane]

BPO	43735
Nosy	@methane

^{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 2021-04-05.13:28:22.148>
labels = ['library', '3.10']
title = 'PEP 597: os.popen() and pipes uses locale encoding'
updated_at = <Date 2021-04-05.13:38:13.511>
user = 'https://github.com/methane'

bugs.python.org fields:

activity = <Date 2021-04-05.13:38:13.511>
actor = 'methane'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-04-05.13:28:22.148>
creator = 'methane'
dependencies = []
files = []
hgrepos = []
issue_num = 43735
keywords = []
message_count = 1.0
messages = ['390234']
nosy_count = 1.0
nosy_names = ['methane']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue43735'
versions = ['Python 3.10']

[methane]

os.popen() and pipes module doesn't have encoding parameter. They use the default (locale) encoding implicitly.

As PEP-597, subprocess module won't emit EncodingWarning for PIPEs in Python 3.10.
Like that, we should just add encoding=None parameter but don't emit EncodingWarning.

[methane]

pipe is deprecated by PEP 594.

[gpshead]

FWIW I suggest a followup tweak making the new parameter keyword only.