question: set the stdin of the process 'grep f' to be 'one\ntwo\nthree\nfour\nfive\nsix\n'
  
target: p = subprocess . Popen ( [ 'grep' , 'f' ] , stdout = subprocess . PIPE , stdin = subprocess . PIPE ) p . stdin . write ( 'one\ntwo\nthree\nfour\nfive\nsix\n' ) p . communicate ( ) [ 0 ] p . stdin . close ( ) 
  