Python中subprocess模块用法实例详解-Python Tutorial-php.cn

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：

>>> subprocess.call(["ls", "-l"])
0
>>> subprocess.call("exit 1", shell=True)
1

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测试调用系统中cmd命令,显示命令执行的结果:

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:

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:

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:

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):

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:

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。

Related labels：

python subprocess module

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