while循环语句实例

Posted 2021-03-08 qi1113

实例1：使用while循环输入 1 2 3 4 5 6 8 9 10

count = 0
while count < 10:
    count += 1  # count = count + 1
    if count == 7:
        print(‘ ‘)
    else:
        print(count)

方法一

count = 0
while count < 10:
    count += 1  # count = count + 1
    if count == 7:
        continue
    print(count)

方法二

实例2：输出 1-100 内的所有奇数

count = 1
while count < 101:
    print(count)
    count += 2

方法一

count = 1
while count < 101:
    if count % 2 == 1:
        print(count)
    count += 1

方法二

实例3：求1-2+3-4+5 ... 99的所有数的和

sum = 0
count = 1
while count < 100:
    if count % 2 == 0:
        sum = sum - count
    else:
        sum = sum + count
    count += 1
print(sum)

代码

实例4：?户登陆（三次输错机会）且每次输错误时显示剩余错误次数（提示：使?字符串格式化）

username = "yangxiaoer"
password = "123456"
i = 3
while i > 0:
    zh = input("请输入你的账号:")
    i -= 1
    if zh == username:
        mm = input("请输入你的密码:")
        if mm == password:
            print("验证成功.正在登陆......")
            print(‘‘‘恭喜你登陆成功!
            欢迎用户进入
            用户名 :%s
            密码   :%s
            ‘‘‘%(zh,mm))
            break
        else:
            if i == 0:
                print("你的机会已经没了!game over 下次见!")
                answer = input(‘再试试？Y or N‘)
                if answer == ‘Y‘:
                    i = 3
            print("密码错误,请重新输入")
            print("你还有"+str(i)+"次机会")
    else:
        print("请输入正确的用户名!")
        if i == 0:
            print("你的机会已经没了!")
            answer = input(‘再试试？Y or N‘)
            if answer == ‘Y‘:
                i = 3
        print("你还有" + str(i) + "次机会")
else:
    print(‘你TM要不要脸‘)

代码

while else使用案例

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 ------")

代码

 参考参鸟教程：https://www.runoob.com/python/python-while-loop.html