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Python学习笔记——从入门到报废(二十八、面向对象编程(四))

  • 2026-05-18 09:50:58
Python学习笔记——从入门到报废(二十八、面向对象编程(四))

上一章,我们使用Animal和Dog的例子讲解了什么是继承,其中Dog中eat函数实现了对Animal中eat函数的重写。除了这种自定义函数的重写,在本章中,我们还会介绍一些特殊的函数重写(重载)。

一、基础重载方法

一些基础的类方法,如构造函数“__init__”、析构函数“__del__”,在前面的内容我们已经讲过如何进行重载,例如继承时对构造函数的重载,按需求销毁对象时自定义的析构函数。

除此外,还有其他的一些基础类方法,可以实现重载,此处举出几个代表,其中obj代表由类生成的对象:

方法/函数名

触发时机/调用方法

用途说明

__init__

创建对象时

初始化对象

__del__

del obj

销毁对象

__str__

str(obj)

获取对象的字符串表示

__len__

len(obj)

获取对象的长度

__contains__

x in obj

对象里是否包含某个成员

__call__

obj()

让对象能够像函数一样被调用

__iter__

for x in obj

迭代器

__getitem__

obj[key]

索引访问,如列表、字典

__setitem__

obj[key] = value

索引赋值

在重写的基础类方法中,我们可以实现一些自定义的代码逻辑。例如对于前面的Dog类,我们创建一个dog对象,并使用str去对其进行字符串表示,得到的结果是:

dog = Dog("金毛""黄色")print(str(dog))# Output: <__main__.Dog object at 0x10be18710>

会发现,输出内容是程序内部的一些控制量,没有太多实际含义。如果在Dog类中重载str,再进行输出,则可以让结果多样化:

class Dog:    def __str__(self):        return f"这是一只{self.hair_color}{self.breed}。"dog = Dog("金毛""黄色")print(str(dog))# Output: 这是一只黄色的金毛。

除此外,对于如“__getitem__”、“__contains__”等类方法,为了实现其预期效果,我们还需要添加如index、key、value等辅助的形参,帮助函数实现内部逻辑。

在重写“__iter__”时,我们通常使用“yield”关键词来替代“return”实现内容的迭代返回。yield将函数变成生成器(Generator),调用时不会立即执行,而是返回一个生成器对象;每次迭代时,函数从上次暂停的地方继续运行,直到再次遇到yield。不正确地说,yield就是返回了一系列值构成的列表。

def count_down(n):    while n > 0:        yield n        n -= 1for i in count_down(3):    print(i, end=" ")# Output: 3 2 1

二、运算符重载

除基础的一些类方法重载,Python也支持对运算符进行重载:

方法/函数名

触发时机/调用方法

用途说明

__eq__ / __ne__

obj == other_obj

obj != other_obj

等于或不等于比较

__lt__ / __le__

obj <= other_obj

obj < other_obj

小于或小于等于

__gt__ / __ge__

obj >= other_obj

obj > other_obj

大于或大于等于

__add__ / __sub__

obj + other_obj

obj – other_obj

加减运算

__mul__ / __truediv__

obj * other_obj

obj / other_obj

乘除运算

举例,我们定义一个虚数类,并重载运算方法:

class Complex:    def __init__(self, real: float, imag: float):        self.real = real        self.imag = imag    def __str__(self) -> str:        return f"{self.real} + {self.imag}i"    def __add__(self, other):        return Complex(self.real + other.real, self.imag + other.imag)    def __sub__(self, other):        return Complex(self.real - other.real, self.imag - other.imag)    def __mul__(self, other):        return Complex(self.real * other.real - self.imag * other.imag,                        self.real * other.imag + self.imag * other.real)

然后,我们调用几个运算:

c1 = Complex(12)c2 = Complex(34)print(f"c1 = {c1}")            # Outout: c1 = 1 + 2iprint(f"c2 = {c2}")            # Output: c2 = 3 + 4iprint(f"c1 + c2 = {c1 + c2}")  # Output: c1 + c2 = 4 + 6iprint(f"c1 - c2 = {c1 - c2}")  # Output: c1 - c2 = -2 + -2iprint(f"c1 * c2 = {c1 * c2}")  # Output: c1 * c2 = -5 + 10i

通过运算示例发现,其按照我们定义好的正常虚数计算逻辑完成了运算。此处还要注意,我们用格式化字符串输出,并没有显式调用str重载,但是解释器会自动进行调用。


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  1. CONNECT:[ UseTime:0.000519s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000860s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000745s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000502s ]
  6. SELECT * FROM `set` [ RunTime:0.000207s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000570s ]
  8. SELECT * FROM `article` WHERE `id` = 489402 LIMIT 1 [ RunTime:0.000379s ]
  9. UPDATE `article` SET `lasttime` = 1779085168 WHERE `id` = 489402 [ RunTime:0.007529s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000445s ]
  11. SELECT * FROM `article` WHERE `id` < 489402 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000417s ]
  12. SELECT * FROM `article` WHERE `id` > 489402 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001561s ]
  13. SELECT * FROM `article` WHERE `id` < 489402 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000922s ]
  14. SELECT * FROM `article` WHERE `id` < 489402 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000690s ]
  15. SELECT * FROM `article` WHERE `id` < 489402 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000833s ]
0.084300s