PEP 597: netrc uses locale encoding.

[methane]

BPO	43733
Nosy	@methane, @zhangyangyu
PRs	bpo-43733: netrc try to use UTF-8 before using locale encoding. #25781

^{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 2021-05-02.05:01:22.264>
created_at = <Date 2021-04-05.12:46:50.522>
labels = ['library', '3.10']
title = 'PEP 597: netrc uses locale encoding.'
updated_at = <Date 2021-05-02.05:01:22.264>
user = 'https://github.com/methane'

bugs.python.org fields:

activity = <Date 2021-05-02.05:01:22.264>
actor = 'methane'
assignee = 'none'
closed = True
closed_date = <Date 2021-05-02.05:01:22.264>
closer = 'methane'
components = ['Library (Lib)']
creation = <Date 2021-04-05.12:46:50.522>
creator = 'methane'
dependencies = []
files = []
hgrepos = []
issue_num = 43733
keywords = ['patch']
message_count = 3.0
messages = ['390232', '391043', '392667']
nosy_count = 2.0
nosy_names = ['methane', 'xiang.zhang']
pr_nums = ['25781']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue43733'
versions = ['Python 3.10']

[methane]

cpython/Lib/netrc.py

Line 29 in c8e5eb9

with open(file) as fp:

Can we change the encoding="utf-8" and errors="replace"?

IMHO, comments are source of UnicodeDecodeError. So we can open file with binary mode and skip comments without decoding it.
But we need to decode non-comment lines lines with some encoding anyway.

[methane]

I googled "netrc UnicodeDecodeError". It is very rare, but I found two cases.

• https://stackoverflow.com/questions/54748450/macos-python-3-netrc-operations-end-up-with-unicodedecodeerror
  This user uses macOS and Python tried UTF-8. But .netrc was not UTF-8.

• https://qiita.com/yuji38kwmt/items/5472c98cb800ccaab093
  This user uses Windows. They write .netrc with UTF-8, but Python used cp932.

---

There are several options:

• Use UTF-8. If user encountered UnicodeDecodeError, user need to change the .netrc encoding.
• Use UTF-8 with "surrogateescape" or "replace" error handler. non-UTF-8 in comments are ignored.
• Use latin-1. non-ASCII characters in comments are ignored.

[methane]

New changeset fd0bc7e by Inada Naoki in branch 'master':
bpo-43733: netrc try to use UTF-8 before using locale encoding. (GH-25781)
fd0bc7e