Timezone not available in python, but the system timezone is properly set

Timezone not available in python, but the system timezone is properly set

As specified in the documentation:
%Z -> Time zone name (no characters if no time zone exists).
According to date, my system has the time zone properly set:
gonvaled@pegasus ~ » date
Sat Sep 28 09:14:29 CEST 2013
But this test:
def test_timezone():
from datetime import datetime
dt = datetime.now()
print dt.strftime('%Y-%m-%d %H:%M:%S%Z')
test_timezone()
Produces:
gonvaled@pegasus ~ » python test_timezone.py
2013-09-28 09:19:10
Without time zone information. Why is that? How can I force python to
output time zone info?
I have also trying re-configuring the time zone with tzselect, but has not
helped.