6. Python Module

The two most commonly used modules:

Os#可以允许python调用执行系统命令, such as the shellSYS#处理与python程序本身的事情 Python comes with more than 200 common modulesThe Python website collects more than 2000 modules and can basically find any features you want, including graphics and interfaces .  SYS module>>>Import SYS        Import Module>>>Sys.path    List the directories for the search modulesys.argv: Output parameter when invoking script

2. [[email protected] python_scripts] #  #!/usr/bin/pythonimport  sysprint   sys.argv  Print sys.argv[1]print Sys.argv[1:3]

5. [[email protected] python_scripts]#python 10sys.py AAA BBB CCC DDD['10sys.py','AAA','BBB','CCC','DDD']aaa['AAA','BBB']

>>>sys.exit ()                exiting the current Python program  OS module

>>>ImportOS>>> Os.system ('hostname') Execute system command LIKUN.COM0 Successful execution returns 0>>> Os.system ('mkdir Books') 0>>> Os.system ('mkdir%s'%col) can also be brought into the variable 0>>> Os.system ('PWD && hostname') executes multiple system commands/root/Python_scriptslikun.com0>>> Os.system ('pwd; hostname')/root/Python_scriptslikun.com0>>> Os.chdir ('/ tmp') to change the directory. (with Os.system (CD/tmp) The next command will be invalidated)>>> Os.listdir (' /Home') to save the contents of the catalog in the list ['Oracle','Nagios']>>> Os.listdir (' /Home') [0]'Oracle'

 Time ModuleTime.sleep (2)  Production Module
 1. Create a mod.py file in the current directory

1.  Span style= "color: #008000;" >#  !/usr/bin/python  name = " my mod   " version  = '  

2. >>>import mod                            --导入模块即执行模块
4. Please input your name:lk
6. >>> mod.askname
8. ‘l k‘
10. >>> mod.version
12. ‘2.1‘
14. >>> print mod.version
16. 2.1
18. >>> mod.name
20. ‘My mod‘

 if the custom module is not in the current directory, you need to add the directory that contains the module to the SYS.PATH environment variable:program exits will expire>>> Import sys>>> sys.path.append ('/root/python_scripts/') >>> import mod  2, import the module is not enabled, you need to put the module contents into the function

1.  Span style= "color: #008000;" >#  !/usr/bin/python  name = " my mod   " version  = '  

1. >>> mod.askname()
2. Please input your name:good
3. ‘good‘

little Exercise: Make a program similar to service XXX startVI service.py[[email protected] support-files]# python service.py httpd status  Small Exercise: make a non-canonical service startup script:

2. [[email protected] python_scripts]# cat service.py 

3. #!/usr/bin/pythonImportSYSImportOSifLen (SYS.ARGV) <3:        Print 'usage:mysql {Status|start|stop|restart}'sys.exit ()ifsys.argv[1]=='MySQL': Action=sys.argv[2] Os.system ('/mysql/support-files/mysql.server%s'%action)

[[email protected] python_scripts]# python service.py mysql restartshutting down MySQL. [OK]starting MySQL. [OK] 

6. Python Module