Python经典编程习题100例：第31例：判断星期几

> 很简单的一个选择结构

letter = input("please input:")
if letter == 'S':
    print('please input second letter:')
    letter = input("please input:")
    if letter == 'a':
        print('Saturday')
    elif letter == 'u':
        print('Sunday')
    else:
        print('data error')
elif letter == 'F':
    print('Friday')
elif letter == 'M':
    print('Monday')
elif letter == 'T':
    print('please input second letter')
    letter = input("please input:")
    if letter == 'u':
        print('Tuesday')
    elif letter == 'h':
        print('Thursday')
    else:
        print('data error')
elif letter == 'W':
    print('Wednesday')
else:
    print('data error')