PEP 597: mailcap uses locale encoding

[methane]

BPO	43732
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 2021-04-05.12:35:59.869>
labels = ['library', '3.10']
title = 'PEP 597: mailcap uses locale encoding'
updated_at = <Date 2021-04-05.12:35:59.869>
user = 'https://github.com/methane'

bugs.python.org fields:

activity = <Date 2021-04-05.12:35:59.869>
actor = 'methane'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-04-05.12:35:59.869>
creator = 'methane'
dependencies = []
files = []
hgrepos = []
issue_num = 43732
keywords = []
message_count = 1.0
messages = ['390231']
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/issue43732'
versions = ['Python 3.10']

[methane]

mailcap.getcaps() uses locale encoding.

cpython/Lib/mailcap.py

Line 33 in c8e5eb9

fp = open(mailcap, 'r')

As my understanding, RFC 1524 uses only ASCII characters.
Can we change the encoding to ASCII or UTF-8?

[brettcannon]

Closing as mailcap is slated for deprecation (#91217).