Use Fully Qualified datetime in Python

Whenever using the datetime module in Python, a highly recommended practice is to just import datetime at the top of the file, and use the fully-qualified module name in the code, as much as possible:

• datetime.datetime
• datetime.timedelta
• datetime.date

If one does from datetime import datetime, it’s hard to figure out at-a-glance what datetime is referring to in the middle of a several-hundred-lines-of-code file.

For similar reasons, another common best practice in Python when using the typing module (https://docs.python.org/3/library/typing.html) is to import is as import typing as T or import typing as t (e.g. https://github.com/pallets/flask/blob/cc66213e579d6b35d9951c21b685d0078f373c44/src/flask/app.py#L7; https://github.com/pallets/werkzeug/blob/3115aa6a6276939f5fd6efa46282e0256ff21f1a/src/werkzeug/wrappers/request.py#L4)