python练习（一）

1、使用while循环输入 1 2 3 4 5 6 8 9 10

count = 1
while count < 11:
    if count == 7:
        pass
    else:
        print(count)
    count = count + 1

2、求1 - 100的所有数的和

n = 1
s = 0
while n < 101:
    s = s + n
    n = n + 1
print(s)

3、输出 1-100内的说有奇数

n = 1
while n < 101:
    zhi = n % 2
    if zhi == 1:
        print(n)
    else:
        pass
    n = n + 1

4、输出 1-100内的所有偶数

n = 1
while n < 101:
    zhi = n % 2
    if zhi == 0:
        print(n)
    else:
        pass
    n = n + 1

5、求1-2+3-4+5...99 的所有数的和

n = 1
s = 0
while n < 100:
    zhi = n % 2
    if zhi == 0:
        s = s - n
    else:
        s = s + n
    n = n + 1
print(s)

6、用户登录，三次机会重试，错误三次 ，就告诉 结束

#我写的 
n = 1
while n < 4:
    temp = input('请输入密码:')
    if temp != "123456":
        print("错误")
    elif temp == "123456":
        print('BINGO')
        break
    n = n + 1
print('结束')

#老师写的

count = 0
while count < 3:
    user = input('请输入用户名：')
    pwd = input('请输入密码：')
    if user == 'lance' and pwd == '123':
        print('欢迎登陆')
        print('您好')
        break
    else:
        print('用户名或者密码错误')
    count = count + 1