pytz_deprecation_shim
UTC
The UTC singleton (with an alias at utc) is a shim class wrapping either datetime.timezone.utc or dateutil.tz.UTC.
timezone(key)
fixed_offset_timezone(offset)
build_tzinfo(zone, fp)
wrap_zone(tz, key=...)
PytzUsageWarning
These exceptions are intended to mirror at least some of pytz's exception hierarchy. The shim classes are designed in such a way that the exception classes they raise can be caught either by catching the value in pytz_deprecation_shim or the equivalent exception in pytz (the actual exception type raised will depend on whether or not pytz has been imported, but the value will either be one of the shim exceptions or a subclass of both the shim exception and its pytz equivalent).
InvalidTimeError
AmbiguousTimeError
NonExistentTimeError
UnknownTimeZoneError