input: Write a function that creates a Python class called Rectangle to represent a two-dimensional rectangle with a length and width, and includes a method to calculate the area of the rectangle.
  
  
  class Rectangle:
      def __init__(self, length, width):
          self.length = length
          self.width = width
  
      def area(self):
          return self.length * self.width
  
  
  assert Rectangle(5, 3).area() == 15
  assert Rectangle(10, 2).area() == 20
  assert Rectangle(4, 4).area() == 16
  assert Rectangle(7, 2).area() == 14
  assert Rectangle(8, 8).area() == 64
output: class Rectangle:
      def __init__(self, length, width):
          self.length = length
          self.width = width
  
      def area(self):
          return self.length * self.width