old_contents: """Creates the escalator class"""
  
  
  class Escalator:
      """
      Each escalator is an instance of the escalator class.
      Methods:
      __init__: creates a new escalator
      """
  
      def __init__(self):
          self.stand_time = None
          self.stand_space = None
          self.walk_time = None
          self.walk_space = None
  
      
      @property
      def rate(self):
          return (self.stand_time * self.stand_space) + self.walk_time * (self.walk_space)
  
new_contents: """Creates the escalator class"""
  
  
  class Escalator:
      """
      Each escalator is an instance of the escalator class.
      Methods:
      __init__: creates a new escalator
      rate: calculates the rate people leave the escalator
      """
  
      def __init__(self):
          self.stand_time = None
          self.stand_space = None
          self.walk_time = None
          self.walk_space = None
  
      
      @property
      def rate(self):
          return (self.stand_time * self.stand_space) + self.walk_time * (self.walk_space)
  
subject: Update escalator.py