python-循环|今日所学-2018-12-27

2种循环方法

 

For后面的else，是正常执行完i之后执行，若中间break，则不执行

for i in range(3):

    age = input("you guss the oldboy's age:")

    if age == oldboy_age:

        print("you are right")

        break

    elif age > oldboy_age:

        print('big')

    else:

        print('small')

else:

    print('you have tried too many times’)

 

while判断，若count不满足条件，则执行else

count = 0

while count<3:

    age = input("you guss the oldboy's age:")

    if age == oldboy_age:

        print("you are right")

        break

    elif age > oldboy_age:

        print('big')

    else:

        print('small')

    count +=1

else:

    print('you have tried too many times’)

 

可手动选择是否循环：

count = 0

while count<3:

    age = input("you guss the oldboy's age:")

    if age == oldboy_age:

        print("you are right")

        break

    elif age > oldboy_age:

        print('big')

    else:

        print('small')

    count +=1

    if count ==3:

        keep_guess = raw_input('do you want contius to guess:')

        if keep_guess != 'n':

            count = 0

 

Continue是结束本次循环，进入下次循环