[issue43392] Optimize repeated calls to `__import__()`

[Antoine Pitrou]

Change by Antoine Pitrou <pitrou at free.fr>:


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components: +Interpreter Core
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
type:  -> performance
versions: +Python 3.11 -Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43392>
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