就是幾個動物，自動排列生成什麼的

class Animal(object):
	def __init__(self,name,weight):
		self.name = name
		self.weight = weight
	def eat(self):
		self.weight +=1
	def speak(self):
		print ("i am a animal")
	def walk(self):
		print ("i am walking")	
	
class Dog(Animal):
	def __init__(self,name,weight):
		Animal.__init__(self,name,weight)
	def eat():
		self.weight +=1
	def speak(self):
		print ("i am a dog")
	def walk(self):
		print ("i am walking")	
class Duck(Animal):
	def __init__(self,name,weight):
		Animal.__init__(self,name,weight)
	def eat(self):
		self.weight +=1
	def speak(self):
		print ("i am a duck")
	def walk(self):
		print ("i am walking")	
class Cat(Animal):
	def __init__(self,name,weight):
		Animal.__init__(self,name,weight)
	def eat(self):
		self.weight +=1
	def speak(self):
		print ("i am a dog")
	def walk():
		print ("i am walking")	



#animal = Dog("Dog",24)

#animal.speak()

def reAnimals(zoo):
	
	string = "animal"
	for x in range(0,21):
		if x%3 ==0:
			animal = Dog(string+str(x),x+2)
		if x%3 ==1:
			animal = Duck(string+str(x),x)		
		if x%3 ==2:
			animal = Cat(string+str(x),x)
		zoo.append(animal)
	return zoo


#zoo = [item for item in animal if item.weight <= 10 and item.weight >= 0]

def filterAnimal(animal):
	zoo = []
	for x in range(0,len(animal)):
		if animal[x].weight<=10 and animal[x].weight>=0:
			zoo.append(animal[x])
	#animal.clear()
	#animal = zoo
	return zoo

animal = []
dongwu = []

dongwu = filterAnimal(reAnimals(dongwu))

for x in dongwu:
	x.speak()
	print (x.weight)



#print (animal[x].weight)


		
 

改版程式碼：

class Animal(object):
	def __init__(self,name,weight):
		self.name = name
		self.weight = weight
	def eat(self):
		self.weight +=1
	def fly(self):
		print ("i am a animal and i can fly")
	def jump(self):
		print ("i can jump ")	
	
class Tiger(Animal):
	def __init__(self,name,weight):
		Animal.__init__(self,name,weight)
	def eat():
		self.weight +=1
	def fly(self):
		print ("i am a Tiger and i cant fly")
	def jump(self):
		print ("i can jump ")		
class Bird(Animal):
	def __init__(self,name,weight):
		Animal.__init__(self,name,weight)
	def eat(self):
		self.weight +=1
	def fly(self):
		print ("i am a bird and i can fly")
	def jump(self):
		print ("i can jump ")	
class Snake(Animal):
	def __init__(self,name,weight):
		Animal.__init__(self,name,weight)
	def eat(self):
		self.weight +=1
	def fly(self):
		print ("i am a snake and i cant fly")
	def jump(self):
		print ("i cant jump ")	
        
container = []
dongwu = []

class Zoo(object):
    def filterAnimal(animal):
        container = []
        for x in range(0,len(animal)):
            if animal[x].weight<=10 and animal[x].weight>=0:
                container.append(animal[x])
        return container
    def reAnimals(container):
        string = "animal"   
        for x in range(0,21):
            if x%3 ==0:
                animal = Tiger(string+str(x),x+2)
            if x%3 ==1:
                animal = Bird(string+str(x),x)		
            if x%3 ==2:
                animal = Snake(string+str(x),x)
            container.append(animal)
        return container	
    def relax():
        dongwu = Zoo.filterAnimal(Zoo.reAnimals(container))
        for x in dongwu:
            x.fly()
            x.jump()
            

Zoo.relax()