[issue42578] Add tip when encountering UnicodeDecode/EncodeError in open()

[Inada Naoki]

Change by Inada Naoki <songofacandy at gmail.com>:


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resolution:  -> wont fix
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42578>
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