Methods as functions tend to be unproductive

• has no @staticmethod decorator and no “self” as first argument
• has @classmethod decorator and no “cls” as first argument

class Rectangle:

    # should be preceded by @staticmethod here
    def area(width, height):
        return width * height

class Rectangle:
    # should be preceded by @classmethod here
    # missing required first argument "cls"
    def print_class_name():
        print("class name: Rectangle")

good

class Rectangle:
    # clarifies that this is a static method and belongs here
    @staticmethod
    def area(width, height):
        return width * height

class Rectangle:
    @classmethod
    def print_class_name(cls):
        # "class name: Rectangle"
        print("class name: {0}".format(cls))