code: def timeFlip(self):
          '''
          Reverse the flow of time for this instance.
  
          Parameters
          ----------
          none
  
          Returns
          -------
          none
          '''
          for name in self.time_vary:
              exec('self.' + name + '.reverse()')
          self.time_flow = not self.time_flof timeFlip(self):
          '''
          Reverse the flow of time for this instance.
  
          Parameters
          ----------
          none
  
          Returns
          -------
          none
          '''
          for name in self.time_vary:
              exec('self.' + name + '.reverse()')
          self.time_flow = not self.time_flow
docs: Reverse the flow of time for this instance.
  
          Parameters
          ----------
          none
  
          Returns
          -------
          none