python练习1

1.使用while循环输入123456 89

#!/usr/bin/env python
# -*- coding: utf-8 -*-
n = 1
while n <11:
　　if n==7:
　　　　pass
　　else:
　　　　print(n)
　　n = n + 1
print('----end----')

 

2.求1-100的和

#!/usr/bin/env python
# -*- coding: utf-8 -*-
n = 1
s = 0
while n < 101:
　　s = s + n
　　n = n + 1
print(s)

 

3.输出1-100中的所有偶数

#!/usr/bin/env python
# -*- coding: utf-8 -*-
n = 1
while n < 101:
    temp = n % 2
    if temp = 0:
        print(n)
    else:
        pass
print('----end----')

 

4.求1-2+3-4.....+99的和

#!/usr/bin/env python
# -*- coding: utf-8 -*-
n = 1
s = 0
while n < 101:
　　temp = n % 2
　　if temp == 0: 
　　  　　s = s - n
　　else:
　　　　　s = s + n
　　n = n + 1
print(s)    

 

5.用户登录，三次机会！

#!/usr/bin/env python
# -*- coding: utf-8 -*-
count = 0
while count < 3:
    user = input('>>>')
    password = input('>>>')
    if user == 'gxtbest' and password == '123':
        print('欢迎登陆')
        print('..........')
        break
    else:
        print('用户名或者密码错误')
    count = count + 1