A module is a function extracted to a file. This allows you to import the function and use it in any other code you may write. You’ll learn how to create modules, import them, and make them stand-alone as you learn what if __name__ == “__main__” means in Python.

 

If we excute the file in REPL, __bname__ is __main__, if we import the file as module, __name__ is file name.

def total(n):    tax_rate = .07    return n * tax_rate + ndef tax_amount(n):    tax_rate = .07    return n * tax_rate# Provide a standalone way for user to use with CMD# python3 tax.py 10if __name__ == "__main__":    import sys    print(total(int(sys.argv[1])))