new_contents: import agents as ag
  import envgui as gui
  # change this line ONLY to refer to your project
  import submissions.VanderKallen.vacuum2 as v2
  
  # ______________________________________________________________________________
  # Vacuum environment
  
  class Dirt(ag.Thing):
      pass
  
  class VacuumEnvironment(ag.XYEnvironment):
  
      """The environment of [Ex. 2.12]. Agent perceives dirty or clean,
      and bump (into obstacle) or not; 2D discrete world of unknown size;
      performance measure is 100 for each dirt cleaned, and -1 for
      each turn taken."""
  
      def __init__(self, width=4, height=3):
          super(VacuumEnvironment, self).__init__(width, height)
          self.add_walls()
  
      def thing_classes(self):
          return [ag.Wall, Dirt,
                  # ReflexVacuumAgent, RandomVacuumAgent,
                  # TableDrivenVacuumAgent, ModelBasedVacuumAgent
                  ]
  
      def percept(self, agent):
          """The percept is a tuple of ('Dirty' or 'Clean', 'Bump' or 'None').
          Unlike the TrivialVacuumEnvironment, location is NOT perceived."""
          status = ('Dirty' if self.some_things_at(
              agent.location, Dirt) else 'Clean')
          bump = ('Bump' if agent.bump else'None')
          return (bump, status)
  
      def execute_action(self, agent, action):
          if action == 'Suck':
              dirt_list = self.list_things_at(agent.location, Dirt)
              if dirt_list != []:
                  dirt = dirt_list[0]
                  agent.performance += 100
                  self.delete_thing(dirt)
          else:
              super(VacuumEnvironment, self).execute_action(agent, action)
  
          if action != 'NoOp':
              agent.performance -= 1
  
  # Launch GUI of more complex environment
  v = VacuumEnvironment(6, 4)
  a = v2.HW2Agent()
  a = ag.TraceAgent(a)
  loc = v.random_location_inbounds()
  v.add_thing(a, location=loc)
  v.scatter_things(Dirt)
  g = gui.EnvGUI(v, 'Vaccuum')
  c = g.getCanvas()
  c.mapImageNames({
      ag.Wall: '../images/wall.jpg',
      # Floor: 'images/floor.png',
      Dirt: '../images/dirt.png',
      ag.Agent: '../images/vacuum.png',
  })
  c.update()
  g.mainloop()
subject: Change ../image