Python基础-----while循环练习

 1 #!/usr/bin/evc python 3
 2 # -*- coding:utf-8 -*-
 3 
 4 ‘‘‘
 5 使用while循环输出1 2 3 4 5 6   8 9 10
 6 ‘‘‘
 7 
 8 count = 1
 9 while count<=10:
10     if count == 7:
11         pass
12     else:
13         print(count)
14     count += 1

 1 #!/usr/bin/evc python 3
 2 # -*- coding:utf-8 -*-
 3 
 4 ‘‘‘
 5 使用while循环输出1~100的和
 6 ‘‘‘
 7 
 8 i = 1
 9 sum = 0
10 while i<=100:
11     sum = sum + i
12     i += 1
13 print(sum)

#!/usr/bin/evc python 3
# -*- coding:utf-8 -*-

‘‘‘
使用while循环输出1~100内所有的奇数
‘‘‘
i = 0
while i < 100:
    i+=1
    while i % 2 != 0:
        print(i)
        i += 1

#!/usr/bin/evc python 3
# -*- coding:utf-8 -*-

‘‘‘
使用while循环输出1~100内所有的偶数
‘‘‘
i = 0
while i < 100:
    i+=1
    while i % 2 == 0:
        print(i)
        i += 1

 1 #!/usr/bin/evc python 3
 2 # -*- coding:utf-8 -*-
 3 
 4 ‘‘‘
 5 使用while循环输出1-2+3-4+5.....+99的和
 6 ‘‘‘
 7 
 8 i = 1
 9 sum = 0
10 while i<=99:
11     if i % 2 == 0:
12         sum = sum - i
13     else:
14         sum = sum + i
15     i += 1
16 print(sum)

 1 #!/usr/bin/evc python 3
 2 # -*- coding:utf-8 -*-
 3 
 4 ‘‘‘
 5 用户登录，三次机会重试
 6 ‘‘‘
 7 
 8 
 9 count = 1
10 while count <= 3:
11 
12     if input(‘请输入用户名：‘) == ‘Liming‘:
13         print(‘登录成功！‘)
14         break
15     else:
16         print(‘请重试！‘)
17     count += 1
18 else:
19     print(‘已失败三次，今日无法登录。‘)