print "hello and that's your sum:"
if __name__ == "__main__":
To execute your program from the command line, you have to call the python interpreter, like this: C:\Python27>python hello.py 1 1
If you code resides in another directory, you will have to set the python binary path in your PATH environment variable, to be able to run it, too. You can find detailed instructions at Adding Python Path on Windows 7