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.
      >>> rect = Rectangle(5.0, 3.0)
      >>> rect.area()
      15.0
      >>> rect = Rectangle(7.5, 2.5)
      >>> rect.area()
      18.75
      """
      class Rectangle:
          def __init__(self, length, width):
              self.length = length
              self.width = width
  
          def area(self):
              return self.length * self.width
      return Rectangle(length, width)
output:     class Rectangle:
          def __init__(self, length, width):
              self.length = length
              self.width = width
  
          def area(self):
              return self.length * self.width
      return Rectangle(length, width)