enumerate

def main():
    days = ['Sun', 'Mon', 'Tues', 'Wed', 'Thurs', 'Fri', 'Sat']
    for d in days:
        print(d)
    print("")
    for d in enumerate(days):
        print(d)
    print("")
    for i, d in enumerate(days):
        print(i, d)
    print("")
    print(list(enumerate(days, 0)))




if __name__ == '__main__':
    main()