[issue35078] Refactor code in calendar.py module

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

We don't usually do pure refactoring changes.

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nosy: +serhiy.storchaka
resolution:  -> rejected
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35078>
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