date.py

# -*- coding: utf-8 -*-
import argparse
import datetime


def main(start, end):
    start = datetime.datetime.strptime(start, '%Y%m%d')
    end = datetime.datetime.strptime(end, '%Y%m%d')
    current = start
    while current <= end:
        print(current.strftime('%Y%m%d'))
        current += datetime.timedelta(days=1)

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('start')
    parser.add_argument('end')
    args = parser.parse_args()
    main(args.start, args.end)