input: def create_rectangle_class(length: float, width: float) -> Rectangle:
      """Create a Python class called Rectangle to represent a two-dimensional rectangle with a length and width.
      The class should have an area method to calculate and return the area of the rectangle.
      >>> rect = create_rectangle_class(5.0, 3.0)
      >>> rect.area()
      15.0
      """
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
      
      return Rectangle(length, width)