本文实例讲述了Python中subprocess模块用法。分享给大家供大家参考。具体如下:
执行命令:
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>>> subprocess.call([ "ls" , "-l" ]) 0 >>> subprocess.call( "exit 1" , shell = True ) 1 |
测试调用系统中cmd命令,显示命令执行的结果:
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x = subprocess.check_output([ "echo" , "Hello World!" ],shell = True ) print (x) "Hello World!" |
测试在python中显示文件内容:
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y = subprocess.check_output([ "type" , "app2.cpp" ],shell = True ) print (y) #include <iostream> using namespace std; ...... |
查看ipconfig -all命令的输出,并将将输出保存到文件tmp.log中:
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handle = open (r 'd:\tmp.log' , 'wt' ) subprocess.Popen([ 'ipconfig' , '-all' ], stdout = handle) |
查看网络设置ipconfig -all,保存到变量中:
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output = subprocess.Popen([ 'ipconfig' , '-all' ], stdout = subprocess.PIPE,shell = True ) oc = output.communicate() #取出output中的字符串 #communicate() returns a tuple (stdoutdata, stderrdata). print (oc[ 0 ]) #打印网络信息 Windows IP Configuration Host Name . . . . . |
我们可以在Popen()建立子进程的时候改变标准输入、标准输出和标准错误,并可以利用subprocess.PIPE将多个子进程的输入和输出连接在一起,构成管道(pipe):
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child1 = subprocess.Popen([ "dir" , "/w" ], stdout = subprocess.PIPE,shell = True ) child2 = subprocess.Popen([ "wc" ], stdin = child1.stdout,stdout = subprocess.PIPE,shell = True ) out = child2.communicate() print (out) ( ' 9 24 298\n' , None ) |
如果想频繁地和子线程通信,那么不能使用communicate();因为communicate通信一次之后即关闭了管道.这时可以试试下面的方法:
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p = subprocess.Popen([ "wc" ], stdin = subprocess.PIPE,stdout = subprocess.PIPE,shell = True ) p.stdin.write( 'your command' ) p.stdin.flush() #......do something try : #......do something p.stdout.readline() #......do something except : print ( 'IOError' ) #......do something more p.stdin.write( 'your other command' ) p.stdin.flush() #......do something more |
希望本文所述对大家的Python程序设计有所帮助。