python学习之老男孩太白金星博客练习题_python基础一

1、使用while循环输入 1 2 3 4 5 6     8 9 10

1 count = 0
2 while count <= 9:
3     count += 1
4     if count == 7:continue
5     print(count)

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2、求1-100的所有数的和

1 count = 0
2 sum = 0
3 while count < 100:
4     count += 1
5     sum = sum + count
6 print(sum)

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3、输出 1-100 内的所有奇数

1 count = 0
2 while count < 100:
3     count += 1
4     if count % 2 == 0:continue
5     print(count)

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4、输出 1-100 内的所有偶数

1 count = 0
2 while count < 100:
3     count += 1
4     if count % 2 == 1:continue
5     print(count)

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5、求1-2+3-4+5 ... 99的所有数的和

1 power = 1
2 count = 0
3 sum = 0
4 while count < 99:
5     count += 1
6     power += 1
7     sum = sum + count*((-1)**power)
8 print(sum)

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6、用户登陆（三次机会重试）

 1 user_name = 'admin'
 2 password = 'admin'
 3 count = 0
 4 while count < 3:
 5     count += 1
 6     name = input ('请输入用户名：')
 7     if name == user_name:
 8         pw = input('请输入密码：')
 9         if pw == password:
10             print('登陆成功')
11             break
12         else :print('密码错误!')
13         if count == 3:print('登陆超过三次！请明天重试。')
14     else :
15         print('用户名不存在!')
16         if count == 3 :print('登陆超过三次！请明天重试。')

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