Pass integer input argument for Popen.communicate()

Question

I am pretty new to python and I am stuck with something now. I am using python 2.7. I am trying to automate a command in shell for which I wrote a python script. I have to input

Answer 1

Finally I found the solution for this. Well the solution to this was pretty simple

---

when I changed

string = proc.communicate(input='2')

to

string = proc.communicate(input='2\n')

it worked fine.