学习心得_while的一个例子

模拟用户登录

count =0
while count <3 :
    usr = input('usr : ')
    pwd = input('pwd :')
    if usr == 'owen' and pwd =='123':
        print('登录成功')
        while True:
            cmd = input('cmd : ')
            if cmd =='q' or cmd == "Q":
                print('退出CMD模式')
                break;
            print (cmd,'指令')
        break;
    else:
        print('登陆失败')
        count +=1

while...else...: else分支会在while循环正常结束

(没有被break结束)时执行

count =0
while count <10:
    count +=1
    if count == 5:
        break; #1 2 3 4
    print(count,end=' ')
else:
    print('我被执行了')
print()
count =0
while count <10:
    count +=1
    if count == 5:
        continue #1 2 3 4 6 7 8 9 10 我被执行了
    print(count,end=' ')
else:
    print('我被执行了')

转载于:https://www.cnblogs.com/blog5434/p/10906416.html