demo1_inheritance.py

"""
demo1: 类继承 (Inheritance)
场景：动物分类系统
"""
from datetime import datetime


class Animal:
    """基类"""
    
    def __init__(self, name: str, age: int):
        self.name = name
        self.age = age
        self._created_at = datetime.now()
    
    def eat(self) -> str:
        return f"{self.name} 正在吃东西"
    
    def sleep(self) -> str:
        return f"{self.name} 正在睡觉"
    
    def get_info(self) -> str:
        return f"动物名: {self.name}, 年龄: {self.age}岁"


class Dog(Animal):
    def __init__(self, name: str, age: int, breed: str):
        super().__init__(name, age)
        self.breed = breed
    
    def bark(self) -> str:
        return f"{self.name} 汪汪叫! 🐶"
    
    def get_info(self) -> str:
        return f"{super().get_info()}, 品种: {self.breed}, 类型: 狗"


class Cat(Animal):
    def __init__(self, name: str, age: int, color: str):
        super().__init__(name, age)
        self.color = color
    
    def meow(self) -> str:
        return f"{self.name} 喵喵叫! 🐱"
    
    def get_info(self) -> str:
        return f"{super().get_info()}, 毛色: {self.color}, 类型: 猫"


if __name__ == "__main__":
    dog = Dog("旺财", 3, "金毛")
    cat = Cat("咪咪", 2, "橘色")
    
    print("=== 继承演示 ===")
    print(dog.get_info())
    print(dog.eat())
    print(dog.bark())
    print()
    print(cat.get_info())
    print(cat.sleep())
    print(cat.meow())
    print()
    print(f"旺财是Animal? {isinstance(dog, Animal)}")
    print(f"旺财是Dog? {isinstance(dog, Dog)}")
    print(f"旺财是Cat? {isinstance(dog, Cat)}")