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 )
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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!"
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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;
......
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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)
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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 . . . . .
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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 )
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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
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希望本文所述对大家的Python程序设计有所帮助。