Python Execution system command: Os.system,os.popen,commands

When writing scripts, the system commands are often executed directly.

First, the Os.system () command is used.

Import Osos.system ("cat/etc/hosts")

However, this method does not get the output and return values.

Two. Then I used the Os.popen () command

Import= Os.popen ("cat/etc/hosts")print Output.read ()

The file read object is returned through Os.popen, so you can see the output directly by Output.read () operation if you want to get the content.

This method also does not get the return value

Three. Commands command

Import= Commands.getstatusoutput ("cat/etc/hosts")Print  Type (status), statusprint type (output), output

You can get the return status and return value here.

Take a look at some examples: (I use the Ipython)

In [1]: Import commands

In [3]: Commands.getstatusoutput ("ls/data/")
OUT[3]: (0, ' dictionary\nhotwords\nlogs\nwordsegment ')

In [4]: Commands.getstatusoutput ("cat/etc/")
OUT[4]: (+, ' Cat:/etc/: is a directory ')

In [6]: Commands.getoutput ("ls/etc/hosts")
OUT[6]: '/etc/hosts '

In [9]: Commands.getstatus ("/BIN/LN")

OUT[9]: '-rwxr-xr-x 1 root root 56072 Mar 2014/bin/ln '

Python Execution system command: Os.system,os.popen,commands