else配合while或者for循环只用注意点

当while循环或者for循环配合else使用时注意以下2点:

 

while 条件:

  语句块

else:

  语句块

 

1.运行while或者for语句块的时候没有break时,else语句块会在whlie或者for语句块结束后执行else里面的语句块

while循环:

count = 0
while count <= 5 :
    count += 1
    if count == 4:
        continue
    print("Loop",count)

else:
    print("循环正常执行完啦")
print("-----out of while loop ------")        

执行结果:

Loop 1
Loop 2
Loop 3
Loop 5
Loop 6
循环正常执行完啦
-----out of while loop ------

 

for循环:

for i in range(1,6):
    if i == 4:
        continue
    print("Loop",i)
else:
    print("循环正常执行完啦")
print("-----out of while loop ------")

执行结果:

Loop 1
Loop 2
Loop 3
Loop 5
循环正常执行完啦
-----out of while loop ------

Process finished with exit code 0

 

2.当运行while或者for语句块的时候有break时,else语句块在whlie或者for语句块结束后不会执行else里面的语句块

count = 0
while count <= 5 :
    count += 1
    if count == 4:
        break
    print("Loop",count)

else:
    print("循环正常执行完啦")
print("-----out of while loop ------")    

执行结果:

Loop 1
Loop 2
Loop 3
-----out of while loop ------

 

for循环:

for i in range(1,6):
    if i == 4:
        break
    print("Loop",i)
else:
    print("循环正常执行完啦")
print("-----out of while loop ------")

执行结果:

Loop 1
Loop 2
Loop 3
-----out of while loop ------

 

posted @ 2018-09-16 18:42  %华&仔%  阅读(2179)  评论(1编辑  收藏  举报