[issue31415] Add -X option to show import time

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

I'm +1 to remove -X option.
Supporting both form makes code ugly and benefit is too small.
And +1 to negative cache too.   It's simple for environment varianle.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31415>
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