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Python类入门:面向对象编程的第一堂课

  • 2026-04-13 20:28:46
Python类入门:面向对象编程的第一堂课

如果说函数是代码的复用单元,那类就是把数据和行为打包成一个整体的核心机制。

类是面向对象编程(OOP)的基础。学完这一章,你会明白:为什么Python里"一切皆对象"?实例和类是什么关系?self为什么必不可少?

这可能是一段时间内最重要的一章。


01 什么是类?先从生活例子说起

把"类"想成制造对象的模具

比如Dog类,就是一套制造小狗的说明书。它规定了每只小狗有什么属性(名字、年龄),能做什么动作(蹲下、打滚)。

根据Dog类,我们可以实例化出具体的小狗:

class Dog():
    """模拟小狗的简单类"""

    def __init__(self, name, age):
        """初始化属性name和age"""
        self.name = name
        self.age = age

    def sit(self):
        """模拟小狗收到命令后蹲下"""
        print(self.name.title() + " is now sitting.")

    def roll_over(self):
        """模拟小狗打滚"""
        print(self.name.title() + " rolled over!")

02 init():构造函数的秘密

__init__是一个特殊方法,每当从类创建一个新实例时,Python会自动调用它。

注意它的特点:

def __init__(self, name, age):
    self.name = name   # self.name是实例的属性
    self.age = age     # name和age是传入的参数

关键理解:self是什么?

self是指向实例本身的引用。让方法能够访问实例的属性。没有self,方法根本不知道它在操作哪个具体的实例。


03 创建实例

my_dog = Dog('willie'6)
print("My dog's name is " + my_dog.name.title() + ".")
print("My dog is " + str(my_dog.age) + " years old.")

输出:

My dog's name is Willie.
My dog is 6 years old.

调用Dog('willie', 6)时,Python:

  1. 调用__init__方法
  2. 创建新实例,把'willie'赋给self.name6赋给self.age
  3. 返回这个实例,存到变量my_dog

调用方法

my_dog = Dog('willie'6)
my_dog.sit()
my_dog.roll_over()
Willie is now sitting.
Willie rolled over!

创建多个实例

my_dog = Dog('willie'6)
your_dog = Dog('lucy'3)

my_dog.sit()
your_dog.sit()

即便两只狗名字年龄都一样,Python也会创建两个完全独立的实例。


04 使用属性和方法

访问属性:实例.属性名

my_dog.name       # 获取名字
my_dog.age        # 获取年龄

修改属性

my_dog.age = 7        # 直接改
my_dog.name = 'max'   # 改名字

05 类作为蓝图:最重要的认知

类是模板/蓝图,实例是根据模板造出来的具体产品。

这意味着:

  • 一个类可以创建任意多个实例
  • 每个实例互相独立
  • 修改一个实例的属性,不影响其他实例
# 这是两个完全独立的对象
my_dog = Dog('willie'6)
your_dog = Dog('lucy'3)

my_dog.age = 10  # 只改了my_dog
print(your_dog.age)  # 输出 3,完全不受影响

06 类的命名约定

遵循约定,代码更易读:

约定 含义
Dog(首字母大写) 类名
my_dog(小写) 实例变量
self.name 实例属性
def sit(self) 方法

本章小结

知识点 说明
class 定义类 类的名字通常首字母大写
__init__() 构造函数,创建实例时自动调用
self 指向实例本身的引用,必须是每个方法的第一个参数
实例属性 通过self.属性名存储在每个实例中
创建实例 my_dog = Dog('willie', 6)
调用方法 my_dog.sit()

📌 下一章预告

学会了类和数据组织,下一步是让程序能持久化地读写数据

第10章「文件和异常」,你会学到如何读取文件内容、如何处理程序运行中的错误(try/except)、以及如何使用json模块保存数据。程序重启后数据还在,这才是真正有用的应用。

如果这篇文章帮你搞懂了类的基础,欢迎关注公众号:Bug与灵光,我会持续更新Python学习笔记,下章见!

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  1. CONNECT:[ UseTime:0.000479s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000672s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002985s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002452s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000709s ]
  6. SELECT * FROM `set` [ RunTime:0.005704s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000676s ]
  8. SELECT * FROM `article` WHERE `id` = 486109 LIMIT 1 [ RunTime:0.004916s ]
  9. UPDATE `article` SET `lasttime` = 1776241866 WHERE `id` = 486109 [ RunTime:0.005046s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000339s ]
  11. SELECT * FROM `article` WHERE `id` < 486109 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000528s ]
  12. SELECT * FROM `article` WHERE `id` > 486109 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004757s ]
  13. SELECT * FROM `article` WHERE `id` < 486109 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.023742s ]
  14. SELECT * FROM `article` WHERE `id` < 486109 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.020799s ]
  15. SELECT * FROM `article` WHERE `id` < 486109 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001838s ]
0.168127s