関連ワード:  what is a main function in python    what is a main method in python    what is main function in python how do you invoke it    what is the purpose of a main function in python    what does a main function do in python    what is the main function called in python    what does a main function look like in python    what is the main function of numpy in python    what are the two main function in python    what is the purpose of a function in python