PYTHON PROGRAM:

Using the bear-fish-plant simulation (you can find the source files in the dropbox for this homework in D2L), add a Berry class so that the bears have another food source. Consider that Berry affects the starvation counter of Bear as well. This class behaves much like the Plant class. Please use bear.py and fish.py given below:

bear.py

import turtle import random from Fish import Fish class Bear(object):  def __init__(self):  self.bturtle = turtle.Turtle() self.bturtle.hideturtle() self.bturtle.shape("Bear.gif") # will only work if the file name has also  # been registered with the World class   self.xpos = 0 self.ypos = 0 self.world = None self.breedTick = 0 self.starveTick = 0 def setX(self, newx):  self.xpos = newx   def setY(self, newy):  self.ypos = newy   def getX(self):  return self.xpos def getY(self):  return self.ypos def setWorld(self, aworld):  self.world = aworld   def appear(self):  self.bturtle.goto(self.xpos, self.ypos) self.bturtle.showturtle() def hide(self):  self.bturtle.hideturtle() def move(self, newx, newy):  self.world.moveLifeForm(self.xpos, self.ypos, newx, newy) self.xpos = newx  self.ypos = newy  self.bturtle.goto(self.xpos, self.ypos) def tryToMove(self):  newLocation = self._getOffsetLocation() if self.world.emptyLocation(newLocation[0], newLocation[1]):  self.move(newLocation[0], newLocation[1]) def tryToBreed(self):  newLocation = self._getOffsetLocation() if self.world.emptyLocation(newLocation[0], newLocation[1]):  child = Bear() self.world.addLifeForm(child, newLocation[0], newLocation[1]) self.breedTick = 0 def _getOffsetLocation(self):  offsetList = [(-1, 1), (0, 1), (1, 1), (-1, 0), (1, 0), (-1, -1), (0, -1), (1, -1)] randomOffsetIndex = random.randrange(len(offsetList)) randomOffset = offsetList[randomOffsetIndex] newx = self.xpos + randomOffset[0] newy = self.ypos + randomOffset[1] while not (0 <= newx < self.world.getMaxX() and  0 <= newy < self.world.getMaxY()):  randomOffsetIndex = random.randrange(len(offsetList)) randomOffset = offsetList[randomOffsetIndex] newx = self.xpos + randomOffset[0] newy = self.ypos + randomOffset[1] return newx, newy def tryToEat(self):  newLocation = self._getOffsetLocation() if (not self.world.emptyLocation(newLocation[0], newLocation[1])) and \ isinstance(self.world.lookAtLocation(newLocation[0], newLocation[1]), Fish):  self.world.delLifeForm(self.world.lookAtLocation(newLocation[0], newLocation[1])) self.move(self.world.lookAtLocation(newLocation[0], newLocation[1])) self.starveTick = 0 else:  self.starveTick += 1 def liveALittle(self): # take a turn  self.breedTick += 1 if self.breedTick >= 8:  self.tryToBreed() self.tryToEat() if self.starveTick == 10:  self.world.delLifeForm(self) else:  self.tryToMove() ------------------------------------------------------------------------------------------- fish.py 

import turtle import random class Fish(object):  def __init__(self):  self.fturtle = turtle.Turtle() self.fturtle.hideturtle() self.fturtle.shape("Fish.gif") # will only work if the file name has also  # been registered with the World class   self.xpos = 0 self.ypos = 0 self.world = None self.breedTick = 0 def setX(self, newx):  self.xpos = newx   def setY(self, newy):  self.ypos = newy   def getX(self):  return self.xpos def getY(self):  return self.ypos def setWorld(self, aworld):  self.world = aworld   def appear(self):  self.fturtle.goto(self.xpos, self.ypos) self.fturtle.showturtle() def hide(self):  self.fturtle.hideturtle() def move(self, newx, newy):  self.world.moveLifeForm(self.xpos, self.ypos, newx, newy) self.xpos = newx  self.ypos = newy  self.fturtle.goto(self.xpos, self.ypos) def tryToMove(self):  newLocation = self._getOffsetLocation() if self.world.emptyLocation(newLocation[0], newLocation[1]):  self.move(newLocation[0], newLocation[1]) def tryToBreed(self):  newLocation = self._getOffsetLocation() if self.world.emptyLocation(newLocation[0], newLocation[1]):  child = Fish() self.world.addLifeForm(child, newLocation[0], newLocation[1]) self.breedTick = 0 def _getOffsetLocation(self):  offsetList = [(-1, 1), (0, 1), (1, 1), (-1, 0), (1, 0), (-1, -1), (0, -1), (1, -1)] randomOffsetIndex = random.randrange(len(offsetList)) randomOffset = offsetList[randomOffsetIndex] newx = self.xpos + randomOffset[0] newy = self.ypos + randomOffset[1] while not (0 <= newx < self.world.getMaxX() and  0 <= newy < self.world.getMaxY()):  randomOffsetIndex = random.randrange(len(offsetList)) randomOffset = offsetList[randomOffsetIndex] newx = self.xpos + randomOffset[0] newy = self.ypos + randomOffset[1] return newx, newy def liveALittle(self): # take a turn  offsetList = [(-1, 1), (0, 1), (1, 1), (-1, 0), (1, 0), (-1, -1), (0, -1), (1, -1)] adjfish = 0 for offset in offsetList:  newx = self.xpos + offset[0] newy = self.ypos + offset[1] if 0 <= newx < self.world.getMaxX() and 0 <= newy < self.world.getMaxY():  if (not self.world.emptyLocation(newx, newy)) and \ isinstance(self.world.lookAtLocation(newx, newy), Fish):  adjfish += 1 if adjfish >= 2:  self.world.delLifeForm(self) else:  self.breedTick += 1 if self.breedTick >= 12:  self.tryToBreed() self.tryToMove()