1、使用while循环输出  1、2、3、4、5、6、8、9、10

# -*- conding:utf-8 -*-
n=1
while n<=10:
    if n!=7:
        print(n)
    n+=1

2、求1-100数的和

1 # -*- conding:utf-8 -*-
2 n=1
3 sum1=0
4 while n<=100:
5     sum1+=n
6     n+=1
7 print(sum1)

3、输出1-100所有的奇数

1 # -*- conding:utf-8 -*-
2 n=1
3 while n<=100:
4     if n%2==1:
5         print(n)
6     n+=1

4、输出1-100所有的偶数

1 # -*- conding:utf-8 -*-
2 n=1
3 while n<=100:
4     if n%2==0:
5         print(n)
6     n+=1

5、求1-2+3-4+5·······99所有数的和

 1 # -*- coding:utf-8 -*-
 2 n=1
 3 sum1=0
 4 while n<=100:
 5     if n%2==1:
 6         sum1+=n
 7     elif n%2==0:
 8         sum1-=n
 9     n+=1
10 print(sum1)

6、用户有三次登陆的机会

 1 # -*- coding:utf-8 -*-
 2 n=3
 3 while n>0:
 4     user_name=input("请输入登陆用户名：")
 5     password=input("请输入密码：")
 6     n-=1
 7     if user_name=="zf":
 8         if password=="123456":
 9             print("登陆成功")
10             break
11         else:
12             print("输入的密码错误")
13             continue
14     else:
15         print("输入的用户名错误")
16         continue
17 if n==0:
18     print("登陆失败，密码已锁住")