p = subprocess.Popen(args='test.bat'.split(), stdout=sp.PIPE, stdin=sp.PIPE, universal_newlines=True)
p.stdin.write("n")
p.stdin.flush()
for line in p.stdout:
    print line

Are you sure you want to continue[Y/N]?

p = subprocess.Popen(args='test.bat'.split(), stdout=sp.PIPE, stdin=sp.PIPE, universal_newlines=True)
for line in p.stdout:
     if line.startswith('Please type x/y"):
          p.stdin.write('x')
          p.stdin.flush()
     if line.startswith('please choose 1/2'):
          p.stdin.write('2')
          p.stdin.flush()

p = sp.Popen(args='try.bat'.split(), cwd=WORKING_DIRECTORY, shell=True, stdout=sp.PIPE, stdin=sp.PIPE, universal_newlines=True)
        while True:
            nextline = p.stdout.readline()
            if nextline.startswith("enter x/y"):
                p.stdin.write("y")
                p.stdin.flush()
            if nextline == '' and p.poll() is not None:
                break
            sys.stdout.write(nextline)
            sys.stdout.flush()