python-while else

count = 0
while count <= 5 :
    count += 1
    if count == 3:break
    print("Loop",count)

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

当while中有break语句打断时，else不会执行。

当while中没有被break语句打断时，else就会执行。

username=''
password=''
i=0
while i<3:
    name=input('input your name:')
    pwd=input('input your password:')
    if name==username and password ==pwd:
        print('login successful!')
        break
    else:
        print(f'login failed,more {2-i} times.')
        if (2-i)==0:
            result=input('Retry? Y/N?')
            if result == 'Y' or result =='y':
                i=0
                continue
    i+=1
print('NO chances!')