Python基础（练习题）

1、使用while循环输出 1 2 3 4 5 6 8 9 10

 1 import time
 2 num = 1
 3 while True:
 4 
 5     if num == 7:
 6         num += 1
 7         continue
 8     print(num)
 9     if num == 10:
10         break
11     num += 1
12     time.sleep(1)

2、求1-100的所有数的和

方法一：
1 start = 1
2 sum = 0
3 while start <= 100:                
4      sum = sum + start             
5      start += 1                         
6 print(sum)

方法二：

1 sum = 0
2 start = 1
3 while True:
4      sum = sum + start
5      if start == 100:
6          break
7      start += 1
8  
9 print(sum)

3、输出 1-100 内的所有奇数

方法一：

1 start = 1
2 while True:
3     if start % 2 == 1:
4         print(start)
5     start += 1
6     if start == 100:
7         break

 方法二：

1 start = 1
2 while start < 101:
3     temp = start % 2
4     if temp == 1:
5         print(start)
6     else:
7         pass
8     start += 1

4、输出 1-100 内的所有偶数

方法一：

1 start = 1
2 while True:
3     if start % 2 == 0:
4         print(start)
5     start += 1
6     if start == 101:
7         break

 方法二：

1 start = 1
2 while start < 101:
3     temp = start % 2
4     if temp == 0:
5         print(start)
6     else:
7         pass
8     start += 1

5、求1-2+3-4+5 ... 99的所有数的和

 1 sum = 0
 2 start = 1
 3 while start <100:
 4     temp = start % 2
 5     if temp == 1:
 6         sum = sum + start
 7     else:
 8         sum = sum - start
 9     start += 1
10 
11 print(sum)

6、用户登陆（三次机会重试）

 1 s = 0
 2 while s < 3:
 3     hostname = input("请输入用户名：")
 4     pwd = input("请输入密码：")
 5     if hostname == "wxq" and pwd == "wxq":
 6         print("登录成功！")
 7         break
 8     else:
 9         if s == 2:
10            print("用户名密码错误，请重置！")
11         else:
12             print("登录失败请重试！")
13     s += 1

posted on 2017-11-27 19:11  无法注册  阅读(259)  评论(0)  编辑  收藏  举报

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