subprocess replacement of popen2 with Python -

i tried run code book 'python standard library' of 'fred lunde'.

import popen2, string  fin, fout = popen2.popen2("sort")  fout.write("foo\n") fout.write("bar\n") fout.close()  print fin.readline(), print fin.readline(), fin.close() 

it runs warning of

 ~/python_standard_library_oreilly_lunde/scripts/popen2-example-1.py:1:  deprecationwarning: popen2 module deprecated.  use subprocess module. 

how translate previous function subprocess? tried follows, doesn't work.

from subprocess import *  p = popen("sort", shell=true, stdin=pipe, stdout=pipe, close_fds=true)  p.stdin("foo\n")                #p.stdin("bar\n") 

import subprocess proc=subprocess.popen(['sort'],stdin=subprocess.pipe,stdout=subprocess.pipe) proc.stdin.write('foo\n') proc.stdin.write('bar\n') out,err=proc.communicate() print(out)