cgitb uses the locale encoding for log files

[serhiy-storchaka]

BPO	41140
Nosy	@vsajip, @ethanfurman, @serhiy-storchaka

^{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 2020-06-27.11:31:23.835>
labels = ['3.8', 'type-bug', 'library', '3.9', '3.10']
title = 'cgitb uses the locale encoding for log files'
updated_at = <Date 2020-07-20.20:50:31.444>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2020-07-20.20:50:31.444>
actor = 'Rhodri James'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-06-27.11:31:23.835>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 41140
keywords = []
message_count = 1.0
messages = ['372463']
nosy_count = 3.0
nosy_names = ['vinay.sajip', 'ethan.furman', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41140'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[serhiy-storchaka]

If logdir is not None the exception handler in cgitb tries to save the description of an error in that directory using the locale encoding. It will fail if the description contains non-encodable characters.

We should either use corresponding error handlers (e.g. 'xmlcharrreplace' for html and 'backslashreplace' for text) for handling encoding errors or use the UTF-8 encoding.

[hugovk]

I think we can close this? The cgitb module is deprecated in 3.11 and set for removal in 3.13.

See PEP 594 – Removing dead batteries from the standard library, #91217 and #32410.