Fix EncodingWarning on Python 3.10 #13510
Merged
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As per PEP 597, text files should always be opened with an explicitly specified encoding. Setting
PYTHONWARNDEFAULTENCODING=1
on Python 3.10 will emitEncodingWarning
to help find mistakes where encoding is omitted. This PR tries to address the problem mostly by explicitly specifying UTF-8 encoding. If there is any case where using the locale encoding is desired, we can further revise this PR.