cdxing In solitude, where we are least alone

python 基础实例

1. 下载安装包

https://www.python.org/ftp/python/2.7.14/python-2.7.14.amd64.msi    # 2.7安装包
 
https://www.python.org/ftp/python/3.6.4/python-3.6.4-amd64.exe      # 3.6安装包

 2. 求1-2+3-4+5 ... 99 的所有数的和

 1 n = 1
 2 s = 0
 3 
 4 while  n < 100:
 5    temp = n % 2
 6    if temp == 0:
 7        s = s -n
 8    else:
 9        s = s + n
10    n = n + 1
11 
12 print(s)
View Code

 3.使用while循环输出 1 2 3 4 5 6     8 9 10

1 n = 1
2     while n < 11:
3         if n == 7:
4             pass
5         else:
6             print(n)
7         n = n + 1
8     
9     print('----end----')
View Code

4.求1-100的所有数的和

1 s = 0
2 while n < 101:
3     s = s + n                        
4     n = n + 1
5 
6 print(s)
View Code

5.输出 1-100 内的所有奇数

 1 n = 1
 2 while n < 101:
 3     temp = n % 2
 4     if temp == 0:
 5         pass
 6     else:
 7         print(n)
 8     n = n + 1
 9 
10 print('----end----')
View Code

6.输出 1-100 内的所有偶数

n = 1
while n < 101:
    temp = n % 2
    if temp == 0:
        print(n)
    else:
        pass
    n = n + 1

print('----end----')
View Code

 7.登陆

#!/usr/bin/python3
# -*- coding: utf-8 -*-

count = 0
while count < 3:
    username = input("please input you username: ")
    password = input("please input you password: ")
    count = count + 1
    if username == "cdx" and password == "cdx123":
        print("login successed....")
        break
    else:
        print("login failed.....,you have %d " % (3 - count) ,"opportunity" )
View Code

 

posted @ 2018-03-24 18:26  cdxing  阅读(100)  评论(0)    收藏  举报