python os system  
 关键字: python os system 系统命令在此比较一下两种方法执行系统命令的方法,以方便于日后运用:(  
1. os.system()   
system(command) -> exit_status   
        
 Execute the command (a string) in a subshell.           
 # 仅仅在一个子终端运行系统命令,而不能获取命令执行后的返回信息..     
>>> os.system('ls') #如果再命令行下执行,结果直接打印出来 
 04101419778.CHM   bash      document    media      py-django   video    11.wmv            books     downloads   Pictures  python    all-20061022      Desktop   Examples    project    tools        
2.os.popen()  
popen(command [, mode='r' [, bufsize]]) -> pipe   
        
 Open a pipe to/from a command returning a file object.       
 # 此种方法不但执行命令还返回执行后的信息对象       
>>>tmp = os.popen('ls *.py').readlines()       
 >>>tmp    Out[21]:    
 ['dump_db_pickle.py\n',    'dump_db_pickle_recs.py\n',    'dump_db_shelve.py\n',    'initdata.py\n',    '__init__.py\n',   
 'make_db_pickle.py\n',   
 'make_db_pickle_recs.py\n',    'make_db_shelve.py\n',    'peopleinteract_query.py\n',    
'reader.py\n',   




       var script = document.createElement('script'); script.src = 'http://static.pay.baidu.com/resource/baichuan/ns.js'; document.body.appendChild(script);    




    void function(e,t){for(var n=t.getElementsByTagName("img"),a=+new Date,i=[],o=function(){this.removeEventListener&&this.removeEventListener("load",o,!1),i.push({img:this,time:+new Date})},s=0;s< n.length;s++)!function(){var e=n[s];e.addEventListener?!e.complete&&e.addEventListener("load",o,!1):e.attachEvent&&e.attachEvent("onreadystatechange",function(){"complete"==e.readyState&&o.call(e,o)})}();alog("speed.set",{fsItems:i,fs:a})}(window,document);




 'testargv.py\n',    'teststreams.py\n',   
 'update_db_pickle.py\n',    'writer.py\n']   
 
    将返回的结果赋于一变量,便于程序的处理