Python 类中引用其他类的实现示例

class Car:
    def __init__(self, make, model):
        self.make = make
        self.model = model
    
    def display_info(self):
        print(f"汽车品牌: {self.make}, 型号: {self.model}")

# 创建类的实例
my_car = Car("Toyota", "Corolla")
my_car.display_info()

class Address:
    def __init__(self, city, street, zipcode):
        self.city = city
        self.street = street
        self.zipcode = zipcode

    def display_address(self):
        return f"{self.city}, {self.street}, {self.zipcode}"

class Person:
    def __init__(self, name, age, address):
        self.name = name
        self.age = age
        self.address = address  # 引用 Address 类的实例

    def display_info(self):
        print(f"姓名: {self.name}, 年龄: {self.age}, 地址: {self.address.display_address()}")

# 创建 Address 类实例
home_address = Address("Beijing", "Zhongguancun", "100080")

# 创建 Person 类实例，并关联 Address 类实例
person = Person("Alice", 30, home_address)

# 显示个人信息
person.display_info()

class Engine:
    def __init__(self, horsepower, engine_type):
        self.horsepower = horsepower
        self.engine_type = engine_type

    def display_engine_info(self):
        return f"发动机类型: {self.engine_type}, 马力: {self.horsepower}hp"

class Car:
    def __init__(self, make, model, engine):
        self.make = make
        self.model = model
        self.engine = engine  # 引用 Engine 类的实例，表示组合关系

    def display_car_info(self):
        print(f"汽车品牌: {self.make}, 型号: {self.model}")
        print(self.engine.display_engine_info())

# 创建 Engine 类实例
car_engine = Engine(150, "V6")

# 创建 Car 类实例，并组合 Engine 类实例
my_car = Car("Toyota", "Camry", car_engine)

# 显示汽车信息
my_car.display_car_info()

class Battery:
    def __init__(self, capacity):
        self.capacity = capacity

    def display_battery_info(self):
        return f"电池容量: {self.capacity}mAh"

class Phone:
    def __init__(self, brand, battery):
        self.brand = brand
        self.battery = battery  # 依赖注入 Battery 类

    def display_phone_info(self):
        print(f"手机品牌: {self.brand}")
        print(self.battery.display_battery_info())

# 创建 Battery 类实例
phone_battery = Battery(4000)

# 将 Battery 实例注入到 Phone 类中
my_phone = Phone("Samsung", phone_battery)

# 显示手机信息
my_phone.display_phone_info()

class Course:
    def __init__(self, course_name):
        self.course_name = course_name

    def display_course_info(self):
        return f"课程名称: {self.course_name}"

class Student:
    def __init__(self, name):
        self.name = name
        self.courses = []  # 学生可以选修多个课程

    def enroll(self, course):
        self.courses.append(course)

    def display_student_info(self):
        print(f"学生姓名: {self.name}")
        print("已选课程:")
        for course in self.courses:
            print(course.display_course_info())

# 创建 Course 类实例
math_course = Course("数学")
english_course = Course("英语")

# 创建 Student 类实例
student = Student("John")

# 学生选修课程（聚合关系）
student.enroll(math_course)
student.enroll(english_course)

# 显示学生信息
student.display_student_info()