剧情：
假设你正在为一个动物园开发一个简单的管理系统。你需要创建一个程序，它能够跟踪不同动物的信息，包括它们的名字、年龄和种类。此外，你还需要能够添加新的动物到动物园中，以及显示所有动物的信息。
创建一个名为 Animal 的基类，包含属性 name（名字）、age（年龄）和 species（种类）。
在 Animal 类中，创建一个初始化方法 __init__ 来初始化这些属性。
创建一个名为 Zoo 的类，它包含一个动物列表作为其属性。
在 Zoo 类中，创建一个方法 add_animal 来添加新的动物到列表中。
创建另一个方法 display_animals 来打印出所有动物的信息。
为 Animal 类添加一个 __str__ 方法，以便在打印动物对象时返回一个格式化的字符串，包含动物的名字、年龄和种类。
测试你的程序，创建3个 Animal 对象，并将它们添加到 Zoo 对象中，然后显示所有动物的信息。参考答案：
class Animal:
def __init__(self, name, age, species):
self.name = name
self.age = age
self.species = species
def __str__(self):
return f"Name: {self.name}, Age: {self.age}, Species: {self.species}"
class Zoo:
def __init__(self):
self.animals = []
def add_animal(self, animal):
self.animals.append(animal)
def display_animals(self):
for animal in self.animals:
print(animal)
# 测试代码
zoo = Zoo()
zoo.add_animal(Animal("Leo", 5, "Lion"))
zoo.add_animal(Animal("Molly", 3, "Elephant"))
zoo.add_animal(Animal("Nina", 2, "Giraffe"))
zoo.display_animals()
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