Open cmd window and run python file with options ( getting Windows error)

I was testing a simple command that looks like this Python 1 2

here is what I tried:

from subprocess import call
file = r"C:\Users\RANIA\Desktop\"
x = 1
y = 2
call(["python"+ " " + file + " " + str(x)+ " " + str(y)]) 

and the contents of the file are:

import sys

def hello(a,b):
    print "hello and that's your sum:", a + b

if __name__ == "__main__":
    a = int(sys.argv[1])
    b = int(sys.argv[2])
    hello(a, b)

I’m getting this error:

Runtime error (Win32Exception): WindowsError
  line 877, in _execute_child, "c:\Program Files\Rhinoceros 5 (64-bit)\Plug-ins\IronPython\Lib\"
  line 488, in call, "c:\Program Files\Rhinoceros 5 (64-bit)\Plug-ins\IronPython\Lib\"
  line 6, in script
  line 669, in __init__, "c:\Program Files\Rhinoceros 5 (64-bit)\Plug-ins\IronPython\Lib\"

Also, I have another question that is related, how do I tell grasshopper to check and see if the python file is executed and bring the results back into grasshopper ?

I solved it, it was the lack of whitespaces and I used the Popen to get the output back!