open2 problem

[mapik.ua at gmail.com]

Hi. I have such problem with os.popen2 function:

 //test.py file
 #!/usr/local/bin/python
 print "start"
 x= raw_input()
 print "end"

 //main.py file
 #!/usr/local/bin/python
 import os
 i,o = os.popen2('./tester.py')
 print o.readline()
 i.write("hi")
 print o.readline()
 i.close()
 o.close()

When I run main.py its hung so I break it running and get exception
error:
  Traceback (most recent call last):
  File "./tester.py", line 4, in ?
    x= raw_input()
Traceback (most recent call last):
KeyboardInterrupt
  File "./c.py", line 5, in ?
    print o.readline()
KeyboardInterrupt

But if I in main.py make some changes its work fine, but i need to read
first line for analyzing:
 //main.py file
 #!/usr/local/bin/python
 import os
 i,o = os.popen2('./tester.py')
 i.write("hi")
 print o.readline()
 print o.readline()
 i.close()
 o.close()