Python Dates and Times in Python Where on Earth do Timezones Make Sense? pytz Format

pytz format challenge task 2

I need help with this challenge. I have attached my code
import datetime
import pytz

fmt = '%m-%d %H:%M %Z%z'
starter = datetime.datetime(2015, 10, 21, 4, 29)

pacific = pytz.timezone('US/Pacific')
local = pacific.localize(starter)

def pytz_string:
    return local.strftime(fmt)