New submission from Petr Prikryl <prik...@atlas.cz>:
When ElementTree object is to be written to the file, and when BOM is needed,
the 'utf-8-sig' can be used for the purpose. However, the XML prolog then looks
like...
<?xml version='1.0' encoding='utf-8-sig'?>
... and that encoding in the prolog makes no sense. Therefore,
the utf-8-sig is changed to utf-8 for the purpose.
To fix the situation, the following two lines should be added to
`cpython/Lib/xml/etree/ElementTree.py`
`elif enc_lower == "utf-8-sig":
declared_encoding = "utf-8"
`
just above the line 741 that says
`write("<?xml version='1.0' encoding='%s'?>\n" % (
declared_encoding,))`
I have already cloned the main branch, added the lines to
`https://github.com/pepr/cpython.git`, and sent pull request.
I have tested the functionality locally with `Python 3.10.2
(tags/v3.10.2:a58ebcc, Jan 17 2022, 14:12:15) [MSC v.1929 64 bit (AMD64)] on
win32`
----------
components: Library (Lib)
messages: 412247
nosy: prikryl
priority: normal
pull_requests: 29231
severity: normal
status: open
title: ElementTree: wrong XML prolog for the utf-8-sig encoding
versions: Python 3.10
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46598>
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