On Thu, Aug 27, 2015 at 10:38 AM, Akira Li <4kir4.1i@gmail.com> wrote:

An *observation*: the local timezone -- the only timezone with a variable
utc offset in _stdlib -- behaves like pytz_:

# start with the same utc time
utc_time = datetime(2015, 10, 25, 1, tzinfo=timezone.utc)
stdlib_time = utc_time.astimezone() # stdlib local time
pytz_time = utc_time.astimezone(tzlocal.get_localzone())

I have no idea where you get tzlocal from, but I can assure you that there is no such thing in the standard library.

What we do have is an option to call .astimezone() without a tzinfo argument and get an aware datetime instance with tzinfo set to a fixed offset timezone. In this respect, .astimezone() is indeed similar to pytz's localize()/normalize(), but it is much simpler.