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How to use subprocess popen Python

Posted by: admin November 29, 2017 Leave a comment

Questions:

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("swfdump /tmp/filename.swf -d")
subprocess.Popen("swfdump %s -d" % (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

Answers:

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.

Questions:
Answers:

Use sh, it’ll make things a lot easier:

import sh
print sh.swfdump("/tmp/filename.swf", "-d")