Write a python class to compute the area of a rectangle

Write a python class named Rectangle constructed by a length and width
and a method which will compute the area of a rectangle.
class Rectangle():

    def __init__(self, l, w):
        self.length = l
        self.width  = w

    def rectangle_area(self):
        return self.length*self.width

newRectangle = Rectangle(12, 10)
print(newRectangle.rectangle_area())           # 120