How to use subprocess popen Python

Question

Since os popen is being replaced by subprocess popen  I was wondering how would I convert os popen  swfdump  tmp filename swf  -d    to subprocess popen   I tried  subprocess Popen  quot swfdump  tmp filename swf -d quot   subprocess Popen  quot swfdump  s -d quot     filename      NOTE  filename is a variable                                                   containing  tmp filename swf  But I guess I m not properly writing this out  Any help would be appreciated  Thanks

User · Answer

Use sh  it ll make things a lot easier   import sh print sh swfdump   tmp filename swf    -d

User · Answer

It may not be obvious how to break a shell command into a sequence of arguments  especially in complex cases  shlex split   can do the correct tokenization for args  I m using Blender s example of the call   import shlex from subprocess import Popen  PIPE command   shlex split  swfdump  tmp filename swf  -d   process   Popen command  stdout PIPE  stderr PIPE  stdout  stderr   process communicate    https   docs python org 3 library subprocess html

User · Answer

subprocess Popen takes a list of arguments   from subprocess import Popen  PIPE  process   Popen   swfdump     tmp filename swf    -d    stdout PIPE  stderr PIPE  stdout  stderr   process communicate     There s even a section of the documentation devoted to helping users migrate from os popen to subprocess

User · Answer

In the recent Python version  subprocess has a big change  It offers a brand-new class Popen to handle os popen1 2 3 4  The new subprocess Popen   import subprocess subprocess Popen  ls -la   shell True   Its arguments  subprocess Popen args                   bufsize 0                   executable None                   stdin None  stdout None  stderr None                   preexec fn None  close fds False                   shell False                   cwd None  env None                   universal newlines False                   startupinfo None                   creationflags 0   Simply put  the new Popen includes all the features which were split into 4 separate old popen  The old popen  Method  Arguments popen   stdout popen2  stdin  stdout popen3  stdin  stdout  stderr popen4  stdin  stdout and stderr  You could get more information in Stack Abuse - Robert Robinson  Thank him for his devotion

User · Answer

Using Subprocess in easiest way   import subprocess cmd    pip install numpy  split     replace with your command subprocess call cmd

[python] How to use subprocess popen Python

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