Interactive programs through Popen3

[Z Three Penguin]

When I try to run an interactive program (such as pico), reading the file
object hangs the interpreter.  The code is:

import popen2
s=popen2.Popen3("pico")
while s.poll()==-1:
    print s.fromchild.read()
    a=raw_input()
    s.inchild.write(a)

Any ideas?

--
-Z3Penguin

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