python [part two]

 1 Windows
 2 1、下载安装包
 3     https://www.python.org/downloads/
 4 2、安装
 5     默认安装路径：C:\python27
 6 3、配置环境变量
 7     【右键计算机】--》【属性】--》【高级系统设置】--》【高级】--》【环境变量】--》【在第二个内容框中找到 变量名为Path 的一行，双击】 --> 【Python安装目录追加到变值值中，用 ； 分割】
 8     如：原来的值;C:\python27，切记前面有分号
 9 
10 
11 linux
12 无需安装，原装Python环境
13   
14 ps：如果自带2.6，请更新至2.7

1 # -*- coding: utf-8 -*-
2 
3 print("你好，世界")

#!/usr/bin/env python
  
print "hello,world"

 1 # -*- coding: utf-8 -*-
 2 
 3 
 4 name = "Garrett"
 5 
 6 name2 = name
 7 
 8 print("My name is ",name2)
 9 
10 name = "gary"
11 
12 print(name2)
13 
14 
15 
16 # 约定大写 代表常量
17 PIE = "3.14"
18 
19 print("你好，世界")

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3 # By   Garrett
 4 
 5 # 格式化输出
 6 username = input("username:")
 7 password = input("password:")
 8 
 9 
10 print("username :",username)
11 print("password :",password)
12 
13 info = ‘‘‘
14 ------info of ----------
15 name : ‘‘‘+username+‘‘‘
16 password : ‘‘‘+password
17 
18 print(info)
19 
20 infos = ‘‘‘
21 ------infos-------
22 name:%s
23 password:%s
24 ‘‘‘ % (username,password)
25 print(infos)
26 # %s  代表string   %d 必须是数字 num
27 # python  是强数据类型语言    转换类型需要用函数
28 
29 info3 = ‘‘‘
30 ---- info 3 -----
31 name: {_username}
32 pass: {_password}
33 ‘‘‘.format(_username =username,_password=password)
34 print(info3)

1 username = input("username:")
2 password = input("password:")
3 
4 info3 = ‘‘‘
5 ---- info 3 -----
6 name: {_username}
7 pass: {_password}
8 ‘‘‘.format(_username =username,_password=password)
9 print(info3)

1 import getpass
2 
3 _name = ‘sys‘
4 _pwd = ‘sys‘
5 
6 username = input("username:")
7 password = getpass.getpass("password:")
8 9 # getpass 这个在pycharm里不好使

 1 _name = ‘sys‘
 2 _pwd = ‘sys‘
 3 
 4 username = input("username:")
 5 
 6 password = input("password")
 7 
 8 
 9 if _name == username  and _pwd == password:
10     print("success! Welcome {_user}".format(_user = username))
11 else:
12     print("error!")

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3 # By   Garrett
 4 
 5 
 6 age_of_boy = 56
 7 
 8 count = 0
 9 
10 while count < 3 :
11     age = int(input("age:"))
12     count+=1
13     if age_of_boy == age :
14         print(‘right!‘)
15         break
16     elif age_of_boy > age :
17         print(‘low‘)
18     else:
19         print(‘high‘)
20 else:
21     print(‘3次机会用完‘)

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3 # By   Garrett
 4 
 5 for i in range(0,10):
 6     if i < 3:
 7         print(i)
 8     else:
 9         continue
10     print(‘haha‘+str(i))

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3 # By   Garrett
 4 
 5 
 6 import sys
 7 import  os
 8 
 9 # 打印文件相对路径和传入的参数 
10 # 这个脚本把执行脚本时传递的参数获取到了
11 print(sys.argv)
12 
13 
14 os.system("df -h") #调用系统命令
15 
16 
17 os.system(‘‘.join(sys.argv[1:])) #把用户的输入的参数当作一条命令交给os.system来执行
18 
19 
20 # cmd_res = os.system(‘dir‘)     #执行命令 不保存结果
21 cmd_res = os.popen("dir")
22 cmd2 = os.popen("dir").read()
23 
24 print("--->",cmd_res)