pytz-deprecation-shim

pytz has served the Python community well for many years, but it is no longer the best option for providing time zones. pytz has a non-standard interface that is very easy to misuse; this interface was necessary when pytz was created, because datetime had no way to represent ambiguous datetimes, but this was solved in in Python 3.6, which added a fold attribute to datetimes in PEP 495. With the addition of the zoneinfo module in Python 3.9 (PEP 615), there has never been a better time to migrate away from pytz. However, since pytz time zones are used very differently from a standard tzinfo, and many libraries have built pytz zones into their standard time zone interface (and thus may have users relying on the existence of the localize and normalize methods); this library provides shim classes that are compatible with both PEP 495 and pytz’s interface, to make it easier for libraries to deprecate pytz.