Assign output of os system to a variable and prevent it from being displayed on the screen

Question

I want to assign the output of a command I run using os system to a variable and prevent it from being output to the screen  But  in the below code  the output is sent to the screen and the value printed for var is 0  which I guess signifies whether the command ran successfully or not  Is there any way to assign the command output to the variable and also stop it from being displayed on the screen   var   os system  cat  etc services   print var  Prints 0

User · Answer

You might also want to look at the subprocess module  which was built to replace the whole family of Python popen-type calls   import subprocess output   subprocess check output  cat  etc services   shell True    The advantage it has is that there is a ton of flexibility with how you invoke commands  where the standard in out error streams are connected  etc

User · Answer

Python 2 6 and 3 specifically say to avoid using PIPE for stdout and stderr   The correct way is   import subprocess    must create a file object to store the output  Here we are getting   the ssid we are connected to outfile   open   tmp ssid    w    status   subprocess Popen   iwgetid    bufsize 0  stdout outfile  outfile close      now operate on the file

User · Answer

i do it with os system temp file   import tempfile os def readcmd cmd       ftmp   tempfile NamedTemporaryFile suffix   out   prefix  tmp   delete False      fpath   ftmp name     if os name   nt           fpath   fpath replace             forwin     ftmp close       os system cmd      gt      fpath      data          with open fpath   r   as file          data   file read           file close       os remove fpath      return data

User · Answer

From  Equivalent of Bash Backticks in Python   which I asked a long time ago  what you may want to use is popen   os popen  cat  etc services   read     From the docs for Python 3 6       This is implemented using subprocess Popen  see that class   s   documentation for more powerful ways to manage and communicate with   subprocesses      Here s the corresponding code for subprocess   import subprocess  proc   subprocess Popen   cat     etc services    stdout subprocess PIPE  shell True   out  err    proc communicate   print  program output    out

User · Answer

For python 3 5  it is recommended that you use the run function from the subprocess module  This returns a CompletedProcess object  from which you can easily obtain the output as well as return code  Since you are only interested in the output  you can write a utility wrapper like this   from subprocess import PIPE  run  def out command       result   run command  stdout PIPE  stderr PIPE  universal newlines True  shell True      return result stdout  my output   out  echo hello world     Or my output   out   echo    hello world

User · Answer

I know this has already been answered  but I wanted to share a potentially better looking way to call Popen via the use of from x import x and functions   from subprocess import PIPE  Popen   def cmdline command       process   Popen          args command          stdout PIPE          shell True           return process communicate   0   print cmdline  cat  etc services   print cmdline  ls   print cmdline  rpm -qa   grep  php    print cmdline  nslookup google com

User · Answer

from os import system  remove from uuid import uuid4  def bash  shell command  str  - gt  tuple       quot  quot  quot        param shell command  your shell command      return    1   0  stdout       quot  quot  quot       logfile  str     tmp  s    uuid4   hex     err  int   system   s  amp  gt   s     shell command  logfile       out  str   open logfile   r   read       remove logfile      return err  out    Example   print bash   cat  usr bin vi   wc -l     gt  gt  gt   0   3296 n

User · Answer

The commands module is a reasonably high-level way to do this   import commands status  output   commands getstatusoutput  cat  etc services     status is 0  output is the contents of  etc services

[python] Assign output of os.system to a variable and prevent it from being displayed on the screen

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