1.创建一个类Animal，包含属性name和方法speak，在创造子类Dog和Cat，分别重新speak方法打印‘汪汪汪’和‘喵喵喵’。

class Animal:
    def __init__(self,name):
        self.name=name
    def speak(self):
        pass
class Dog(Animal):
    def speak(self):
        return '汪汪汪'
class Cat(Animal):
    def speak(self):
        return '喵喵喵'
dog=Dog('旺财')
cat=Cat('鱼干')
print(dog.speak())
print(cat.speak())

2.创建一个类Shape，包含属性color和方法draw，再创建子类Circle和Rectangle，分别实现draw方法打印对应颜色的圆形和矩形。

class Shape:
    def __init__(self,color):
        self.color=color
    def draw(self):
        pass
class Circle(Shape):
    def draw(self):
        return f'绘制一个{self.color}的圆形'
class Rectangle(Shape):
    def draw(self):
        return f'绘制一个{self.color}的矩形'
circle=Circle('红色')
rectangle=Rectangle('蓝色')
print(circle.draw())
print(rectangle.draw())