[issue38691] importlib: PYTHONCASEOK should be ignored when using python3 -E

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

When using python3 -E or python3 -I, PYTHONCASEOK environment variable should be ignored by importlib. See an email sent in 2012:
https://mail.python.org/pipermail/python-dev/2012-December/123403.html

See importlib._bootstrap_external._relax_case attribute and its _make_relax_case() function.

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components: Library (Lib)
messages: 355996
nosy: vstinner
priority: normal
severity: normal
status: open
title: importlib: PYTHONCASEOK should be ignored when using python3 -E
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38691>
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