为什么这会给我一个错误,我该如何解决？

Question

这是我的代码:

line = ' '
while line != '':
    line = input('Line: ')
    phonic = line.split()
    start = phonic[0]
    start_4 = phonic [3]
    a = start[0]
    if start_4.startswith(a):
        print('Good!')
    else:
        print("That's not right!")

我想我知道,因为line = '',phonic试图分裂它,但那里什么都没有,我该如何解决？

Answer 1

在做其他任何事情之前,你会想要一个条件语句:

line = ' '
while line:
    line = input('Line: ')
    if not line:
        break # break out of the loop before raising any KeyErrors
    phonic = line.split()
    start = phonic[0]
    start_4 = phonic [3]
    a = start[0]
    if start_4.startswith(a):
        print('Good!')
    else:
        print("That's not right!")

请注意,while line != ''可以简单地缩短while line,因为''被认为是False,那么!= False就是== True,这是可以根除的.