[issue40799] Create Lib/_pydatetime.py file to optimize "import datetime" when _datetime is available

[Paul Ganssle]

Paul Ganssle <p.ganssle at gmail.com> added the comment:

> bout _strptime, I see that the time.strptime() imports internally the _strptime module.

Ah, sorry, my remark about including `_strptime` was off the cuff — I thought it was only used in `datetime`, which is why I said "possibly _strptime". If it's used for `time` as well, we should leave it where it is.

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