Python3.x: Print every Sunday

sunday_list.py

from datetime import datetime
from dateutil.relativedelta import relativedelta, SU
from dateutil.rrule import rrule, WEEKLY

import argparse

def main(args):
    start = datetime.strptime(args.start_date, "%Y%m%d")
    today = datetime.today()
    rule = rrule(WEEKLY, byweekday=SU, dtstart=start, until=today)

    print(*[ sunday.strftime("%Y%m%d") for sunday in list(rule)])

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('start_date',help='Start Date as "YYYYmmdd"')
    args = parser.parse_args()
    main(args)