input: def Rectangle(length: float, width: float) -> 'Rectangle':
      """Create a Python class called Rectangle to represent a two-dimensional rectangle with a length and width.
      This class includes a method to calculate the area of the rectangle.
      >>> rect = Rectangle(4, 5)
      >>> rect.area()
      20
      """
output:     
      class Rectangle:
          def __init__(self, length: float, width: float):
              self.length = length
              self.width = width
          
          def area(self) -> float:
              return self.length * self.width
  