[issue31415] Add -X option to show import time

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

The importtime option is cached only if it is set. If it is not set (the common case), it is not cached.

PR 4138 makes it be cached in the common case and improves errors handling.

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status: closed -> open

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