python 2.7 - Pass integer input argument for Popen.communicate() -

i pretty new python , stuck now. using python 2.7. trying automate command in shell wrote python script. have input integer value shell using popen.communicate(input='2'). though input passed, passed string , subprocess needs numeric value. when try pass numberic value popen.communicate(input=2) throws following error :

typeerror: 'int' object has no attribute '__getitem__'

so there way send input numeric value ??

here code use :

import sys subprocess import popen, pipe, stdout  cmd = ["sudo", "./sbt", "project java-examples", "run"] proc = popen(cmd, bufsize=4096, shell=false, stdout=pipe, stdin=pipe, stderr=stdout)  string = proc.communicate(input='2') print string[0] proc.stdin.close() 

edit : sorry didn't mentioned @ first place. java application has multiple main classes hence compiler ask class executed, , need enter same number every time,which why trying automate it. when passing string value throws numberformatexception.

finally found solution this. solution pretty simple

---

when changed

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

to

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

it worked fine.