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Python学习笔记(类之间关系)

  • 2026-04-04 16:19:55
Python学习笔记(类之间关系)

本文档展示了 Python 面向对象编程的核心概念,通过 Person 类及其子类的实例深入理解继承、关联和依赖关系。


📚 核心概念

🔒 slots 魔法属性

如果要限制一个类的对象只能拥有特定属性,可以在类中使用 __slots__ 魔法属性:

classPerson:    __slots__ = ('name''age')  # 限制对象只能有 name 和 age 属性

🧬 继承 (Inheritance)

对已有的类进行扩展创建出新类,这个过程就叫继承。

术语
说明
🎯 父类(超类、基类)
提供继承信息的类
📦 子类(派生类)
得到继承信息的类

子类直接从父类继承公共的属性和行为,再添加自己特有的属性和行为。

🔗 类之间的关系

📋 is-a 关系:继承

从一个类派生出另一个类,表示 "是一个" 的关系:

    Person --> Student    Person --> Teacher
  • a student is a person
  • a teacher is a person

🗂️ has-a 关系:关联

把一个类的对象作为另外一个类的对象的属性,表示 "拥有" 的关系:

    Student -- 拥有 --> Computer    Person -- 拥有 --> 身份证    Car -- 拥有 --> 引擎
  • a person has an identity card
  • a car has an engine
    • (普通) 关联
    • 强关联:整体和部分关联,聚合和合成

⚙️ use-a 关系:依赖

一个类对象作为另外一个类的方法参数或者返回值,表示 "使用" 的关系:

  • a person use a vehicle

🧩 多重继承

Python 中的继承允许多重继承,一个类可以有多个父类。


🏗️ 类结构

📦 Computer 类

classComputer:pass

空类,用于演示关联关系


👤 Person 类 (基类)

classPerson:""" 人类基类 """def__init__(self, name, age, gender):        self.name = name        # 姓名        self.age = age          # 年龄        self.gender = gender    # 性别 (True=男, False=女)defeat(self):""" 吃饭 """        print(f'{self.name}正在吃饭.')defspeak(self):""" 显示年龄 """        print(f'{self.name}今年的岁数:{self.age}')defintroduce(self):""" 自我介绍 """        sex = "男"if self.gender else"女"        print(f'我叫{self.name},性别:{sex},今年{self.age}岁')

基类,包含 name、age、gender 属性和 eat、speak、introduce 方法


👨‍🏫 Teacher 类

classTeacher(Person):""" 教师类 """def__init__(self, name, age, gender, title):        super().__init__(name, age, gender)        self.title = title    # 职称defteach(self, course_name):""" 授课 """        print(f'{self.name}{self.title}正在教魔兽王学习[{course_name}]课程')
继承关系
新增属性
新增方法
Person → Teacher
title
teach()

👨‍🎓 Student 类

classStudent(Person):""" 学生类 """def__init__(self, name, age, gender, grade):        super().__init__(name, age, gender)        self.grade = grade    # 年级# 学生与电脑是关联关系可以有多个,也可以是单个        self.computers = [Computer(), Computer()]defstudy(self, course_name):""" 学习 """        print(f'{self.name}正在学习{course_name}')
继承关系
新增属性
关联对象
新增方法
Person → Student
grade
computers
study()

💻 使用示例

🎓 创建学生对象

# 实例化学生对象stu = Student("王小婷"16False"初二")# 调用继承自父类的方法stu.introduce()  # 输出: 我叫王小婷,性别:女,今年16岁stu.eat()        # 输出: 王小婷正在吃饭.stu.speak()       # 输出: 王小婷今年的岁数:16# 调用子类特有方法stu.study("数学"# 输出: 王小婷正在学习数学

👨‍🏫 创建教师对象

# 实例化教师对象teach = Teacher("王伯"56True"教授")# 调用继承自父类的方法teach.introduce()  # 输出: 我叫王伯,性别:男,今年56岁teach.eat()        # 输出: 王伯正在吃饭.teach.speak()       # 输出: 王伯今年的岁数:56# 调用子类特有方法teach.teach("动力学"# 输出: 王伯教授正在教魔兽王学习[动力学]课程

关键关系说明

  1. 🧬 继承关系Teacher 和 Student 都继承自 Person,复用了父类的属性和方法
  2. 🗂️ 关联关系Student 类中包含 computers 列表,演示 has-a 关系
  3. ⚙️ 依赖关系:方法参数中使用其他类对象

🎯 员工薪资结算系统

核心概念

以下面向对象编程概念:

概念
说明
应用场景
🧬 继承
子类继承父类的属性和方法
所有员工类型继承自 Employee 基类
🔄 多态
同一方法在不同对象中有不同实现
calculate_salary 方法在不同子类中有不同计算逻辑
📦 抽象方法
定义接口而不实现,由子类实现
基类中的 calculate_salary 抽象方法
🔧 封装
将数据和操作数据的方法组合在一起
SalaryCalculator 封装员工管理和薪资计算逻辑

🏗️ 类结构

📋 Employee 类 (抽象基类)

classEmployee:""" 员工基类 """def__init__(self, name, employee_id):        self.name = name              # 员工姓名        self.employee_id = employee_id  # 员工编号defcalculate_salary(self):""" 计算月薪(子类需重写) """raise NotImplementedError("子类必须实现 calculate_salary 方法")defintroduce(self):""" 自我介绍 """        print(f"员工编号:{self.employee_id},姓名:{self.name}")
属性/方法
类型
说明
name
属性
员工姓名
employee_id
属性
员工编号
calculate_salary()
抽象方法
计算月薪(子类必须实现)
introduce()
方法
自我介绍

👔 FullTimeEmployee 类 (全职员工)

classFullTimeEmployee(Employee):""" 全职员工:固定月薪 """def__init__(self, name, employee_id, monthly_salary):        super().__init__(name, employee_id)        self.monthly_salary = monthly_salary  # 月薪defcalculate_salary(self):return self.monthly_salary
继承关系
新增属性
薪资计算方式
Employee → FullTimeEmployee
monthly_salary
固定月薪

⏱️ PartTimeEmployee 类 (兼职员工)

classPartTimeEmployee(Employee):""" 兼职员工:按时薪和工作时长计算 """def__init__(self, name, employee_id, hourly_rate, work_hours):        super().__init__(name, employee_id)        self.hourly_rate = hourly_rate  # 时薪        self.work_hours = work_hours    # 工作时长defcalculate_salary(self):return self.hourly_rate * self.work_hours
继承关系
新增属性
薪资计算方式
Employee → PartTimeEmployee
hourly_rate, work_hours
时薪 × 工作时长

💰 SalesEmployee 类 (销售员工)

classSalesEmployee(Employee):""" 销售员工:底薪 + 提成 """def__init__(self, name, employee_id, base_salary, sales_amount, commission_rate):        super().__init__(name, employee_id)        self.base_salary = base_salary            # 底薪        self.sales_amount = sales_amount           # 销售额        self.commission_rate = commission_rate     # 提成比例defcalculate_salary(self):        commission = self.sales_amount * self.commission_ratereturn self.base_salary + commission
继承关系
新增属性
薪资计算方式
Employee → SalesEmployee
base_salary, sales_amount, commission_rate
底薪 + 销售额 × 提成比例

🧮 SalaryCalculator 类 (薪资计算器)

classSalaryCalculator:""" 薪资计算器:统一管理员工薪资结算 """def__init__(self):        self.employees = []  # 员工列表defadd_employee(self, employee):""" 添加员工 """        self.employees.append(employee)defcalculate_all(self):""" 计算所有员工薪资 """        total = 0        print("=" * 40)        print("员工薪资结算单")        print("=" * 40)for emp in self.employees:            salary = emp.calculate_salary()            total += salary            emp.introduce()            print(f"本月薪资:{salary:.2f} 元")            print("-" * 40)        print(f"薪资总计:{total:.2f} 元")        print("=" * 40)return total
方法
功能
add_employee()
添加员工到计算器
calculate_all()
计算并显示所有员工薪资

💻 使用示例

📝 创建和计算薪资

if __name__ == "__main__":# 创建薪资计算器    calculator = SalaryCalculator()# 添加不同类型的员工    calculator.add_employee(FullTimeEmployee("张三""FT001"15000))    calculator.add_employee(FullTimeEmployee("李四""FT002"12000))    calculator.add_employee(PartTimeEmployee("王五""PT001"5080))    calculator.add_employee(PartTimeEmployee("赵六""PT002"6060))    calculator.add_employee(SalesEmployee("钱七""SL001"8000500000.05))    calculator.add_employee(SalesEmployee("孙八""SL002"6000800000.08))# 结算薪资    calculator.calculate_all()

🖥️ 输出结果

========================================员工薪资结算单========================================员工编号:FT001,姓名:张三本月薪资:15000.00 元----------------------------------------员工编号:FT002,姓名:李四本月薪资:12000.00 元----------------------------------------员工编号:PT001,姓名:王五本月薪资:4000.00 元----------------------------------------员工编号:PT002,姓名:赵六本月薪资:3600.00 元----------------------------------------员工编号:SL001,姓名:钱七本月薪资:10500.00 元----------------------------------------员工编号:SL002,姓名:孙八本月薪资:12400.00 元----------------------------------------薪资总计:57500.00 元========================================

🔍 多态实现原理

graph TD    A[SalaryCalculator.calculate_all] --> B[遍历员工列表]    B --> C[调用每个员工的 calculate_salary]    C --> D{员工类型}    D --> |FullTimeEmployee| E[返回固定月薪]    D --> |PartTimeEmployee| F[返回时薪 × 工作时长]    D --> |SalesEmployee| G[返回底薪 + 销售额 × 提成]    E --> H[累加到总薪资]    F --> H    G --> H    H --> I[输出结果]

多态的优势

  1. 代码复用:无需为每种员工类型编写单独的计算逻辑
  2. 扩展性:新增员工类型只需继承 Employee 并实现 calculate_salary
  3. 统一接口:所有员工对象都响应相同的 calculate_salary 调用
  4. 封装性:薪资计算逻辑封装在各自的类中

📈 薪资计算公式

员工类型
计算公式
参数说明
全职员工
薪资 = monthly_salary
monthly_salary: 月薪
兼职员工
薪资 = hourly_rate × work_hours
hourly_rate: 时薪, work_hours: 工作时长
销售员工
薪资 = base_salary + sales_amount × commission_rate
base_salary: 底薪, sales_amount: 销售额, commission_rate: 提成比例

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  1. CONNECT:[ UseTime:0.000530s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000791s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000335s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000740s ]
  6. SELECT * FROM `set` [ RunTime:0.000297s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000660s ]
  8. SELECT * FROM `article` WHERE `id` = 468290 LIMIT 1 [ RunTime:0.000545s ]
  9. UPDATE `article` SET `lasttime` = 1775296313 WHERE `id` = 468290 [ RunTime:0.002054s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000305s ]
  11. SELECT * FROM `article` WHERE `id` < 468290 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000950s ]
  12. SELECT * FROM `article` WHERE `id` > 468290 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000643s ]
  13. SELECT * FROM `article` WHERE `id` < 468290 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001031s ]
  14. SELECT * FROM `article` WHERE `id` < 468290 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001084s ]
  15. SELECT * FROM `article` WHERE `id` < 468290 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002214s ]
0.106380s