How to make an unaware datetime timezone aware in python

Question

What I need to do

I have a timezone-unaware datetime object, to which I need to add a time zone in order to be able to compare it with other timezon

Answer 1

I wrote this at Nov 22 2011 , is Pyhton 2 only , never checked if it work on Python 3

I had use from dt_aware to dt_unaware

dt_unaware = dt_aware.replace(tzinfo=None)

and dt_unware to dt_aware

from pytz import timezone
localtz = timezone('Europe/Lisbon')
dt_aware = localtz.localize(dt_unware)

but answer before is also a good solution.