title: Python calling raw_input from a subprocess
body: <p>I'm calling a python script from the below one using subprocess. From the command line the user chooses which file to open using raw_input</p>
  
  <pre><code>import optparse
  import subprocess
  import readline
  import os
  
  def main():
  
      options = {'0': './option_0.py',
              '1': './option_1.py',
              '2': './option_2.py',
              '3': './option_3.py'}
      input = -1
  
      while True:
          if input in options:
              file = options[input]
              subprocess.Popen(file)
          else:
              print "Welcome"
              print "0. option_0"
              print "1. option_1"
              print "2. option_2"
              print "3. option_3"
              input = raw_input("Please make a selection: ")
  
  if __name__ == '__main__':
      main()
  </code></pre>
  
  <p>However on the subprocess called(say option_1.py is called) I have a problem using raw_input again to accept prompt from the user. I am aware of the .PIPE arguments and have tried</p>
  
  <pre><code>subprocess.Popen(file, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  </code></pre>
  
  <p>But again no luck.</p>