This Gist contains one function and a decorator. As you see in the example, you do not need an `if __name__ == "__main__:" to call any statement.`

main.py

def mainFunc(func):  # func is the function
    result = func()  # which should be called at begin.

    # Note: Python executes the file from top to bottom. so every statment that is not in a function (like
    # `print`) will be executed before the main function if it is earlyer defined

    def wrapper():
        nonlocal result
        print(result)  # print the result
        return result  # and return it

    return wrapper()  # call wrapper function
    # Note: while the function is called in the `mainFunc` scope, you shouldn't call it here
    # except you want an infinite loop
    # Note 2: if you do not need the wrapper (and the function result) you can just remove the parentheses


@mainFunc
def main():
    print("Hello World")
    return 0