Example of modularization with Python packages.

__init__.py

__all__ = ["game"]

README.md

# Run the hello game:
python hello_game.py

# Run the hello and bye game:
python hello_and_bye_game.py

hello_and_bye_game.py

from hello_game import say_hello

def say_good_bye():
    print 'Good Bye!'

# say hello
say_hello()
# say good bye
say_good_bye()

hello_game.py

print "The 'hello_game.py' file __name__ is:", __name__, "\n"

def say_hello():
    print 'Hello!'

if __name__ == '__main__': # the file was called from the command line (not imported)
    say_hello()