update hello-wold.py
update hello-wold.py

use __name__ == "__main__"
salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world,salman-bhai/hello-world