python 面向对象编程案例

以下是一个简单的 Python 面向对象编程案例：

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def introduce(self):
        print(f"My name is {self.name} and I am {self.age} years old.")

class Student(Person):
    def __init__(self, name, age, major):
        super().__init__(name, age)
        self.major = major

    def introduce(self):
        print(f"My name is {self.name}, I am {self.age} years old, and I major in {self.major}.")

class Teacher(Person):
    def __init__(self, name, age, subject):
        super().__init__(name, age)
        self.subject = subject

    def introduce(self):
        print(f"My name is {self.name}, I am {self.age} years old, and I teach {self.subject}.")

# 创建对象
person1 = Person("Tom", 25)
student1 = Student("Jerry", 20, "Computer Science")
teacher1 = Teacher("John", 30, "Mathematics")

# 调用方法
person1.introduce()
student1.introduce()
teacher1.introduce()

此代码定义了一个 `Person` 类，以及两个子类 `Student` 和 `Teacher`。每个类都有一个 `introduce` 方法，用于打印该对象的信息。然后创建了三个对象，分别是普通人、学生和老师，并调用了他们的 `introduce` 方法。

输出结果为：

My name is Tom and I am 25 years old.
My name is Jerry, I am 20 years old, and I major in Computer Science.
My name is John, I am 30 years old, and I teach Mathematics.

这个案例展示了 Python 面向对象编程的一些基本概念，包括继承、多态和方法重写。