from zoneinfo import ZoneInfo
from datetime import datetime, timezone

utc = timezone.utc
tz_name = "America/Los_Angeles"
dt_utc = datetime(2020, 11, 1, 8, tzinfo=utc)


def run_it(tz):
    print(f"\n\n{type(tz) = }")
    dt_local = dt_utc.astimezone(tz)
    print(f"{dt_local == dt_utc = }")
    print(f"{dt_local <= dt_utc = }")
    print(f"{dt_local >= dt_utc = }")
    print(f"{dt_local - dt_utc = }")


run_it(ZoneInfo(tz_name))

try:
    from dateutil import tz
    import pytz
except:
    print("run comparisons with 'pip install python-dateutil pytz'")
else:
    run_it(tz.gettz(tz_name))
    run_it(pytz.timezone(tz_name))