[issue41718] test.regrtest has way too many imports

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

If I hack test.libregrtest.runtest to not import test.libregrtest.save_env, test_sys_modules imports only 148 instead of 233 modules.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41718>
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