Use StringIO as stdin with Popen

Question

I have the following shell script that I would like to write in Python (of course grep . is actually a much more complex command):

#!/bin/bash

         


        

Answer 1

p = subprocess.Popen(['grep', '...'], stdin=subprocess.PIPE, 
                                      stdout=subprocess.PIPE)
output, output_err = p.communicate(myfile.read())