When should we see toasty

when_should_we_go_home.py

import sys

from datetime import date, datetime


def when_should_we_go_home(toasty_birth_date):

    if toasty_birth_date <= date(2017, 10, 28):
        return (date(2017, 10, 29), date(2017, 10, 30))

    if toasty_birth_date <= date(2017, 11, 3):
        return (date(2017, 11, 4), date(2017, 11, 5))

    if toasty_birth_date <= date(2017, 11, 19):
        return (date(2017, 11, 15), date(2017, 11, 19))

    raise NotImplementedError('Toasty came really late')


if __name__ == '__main__':
    try:
        toasty_birth_date = datetime.strptime(sys.argv[-1], '%m/%d/%Y').date()
    except ValueError:
        print('USAGE: when_should_we_go_home.py 11/01/2017')
        sys.exit()

    start, end = when_should_we_go_home(toasty_birth_date)
    print('{:%m/%d/%Y} - {:%m/%d/%Y}'.format(start, end))