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Python 面向对象习题(6/10)

Python 面向对象习题(6/10)

本文首发于微信公众号「拙见python」,基础板块第 9 篇。适合人群:已阅读第 2 篇:Python 面向对象编程并动手敲过代码的读者。题目难度:⭐ → ⭐⭐⭐⭐⭐ 逐步提升,建议先自己写,再看答案。


做题须知

  • 每道题标注了考察知识点难度星级
  • 先自己写,写不出来再看答案
  • 答案不是唯一的,能跑通且逻辑正确就行
  • 每道题答案下方附有思路解析

第 6 题:多继承与 MRO 分析 ⭐⭐⭐⭐

考察知识点:多继承、MRO(方法解析顺序)、super() 在多继承中的行为

阅读以下代码,先预测输出,再运行验证:

  1. D的 MRO 是什么?
  2. d.show()调用的是哪个类的show()?
  3. d.greet()的输出是什么?为什么super().greet()会调用B的方法?
class A:    def greet(self):        print(”A.greet”)        super().greet()    def show(self):        return ”A.show”class B(A):    def greet(self):        print(”B.greet”)    def show(self):        return ”B.show”class C(A):    def greet(self):        print(”C.greet”)        super().greet()    def show(self):        return ”C.show”class D(B, C):    def greet(self):        print(”D.greet”)        super().greet()

参考答案与解析:

# 1. 查看 MROprint(”D 的 MRO:”)for cls in D.__mro__:    print(f”  {cls.__name__}”)# D 的 MRO:#   D#   B#   C#   A#   object# 2. d.show() 调用哪个类?d = D()print(f”\nd.show() = {d.show()}”)# d.show() = B.show# 原因:D 没有定义 show(),按 MRO 顺序查找,B 在 C 之前,所以调用 B.show()# 3. d.greet() 的输出print(”\nd.greet() 输出:”)d.greet()# D.greet# B.greet

输出结果:

D 的 MRO:  D  B  C  A  objectd.show() = B.showd.greet() 输出:D.greetB.greet
# 追问:如果 D 定义为 class D(C, B) 呢?classD2(CB):    passprint(”D2 的 MRO:”)for cls in D2.__mro__:    print(f”  {cls.__name__}”)# D2 → C → B → A → objectd2 = D2()print(f”\nd2.show() = {d2.show()}”)# d2.show() = C.show(C 在 B 之前了)print(”\nd2.greet() 输出:”)d2.greet()# C.greet# A.greet# 原因:C.greet 调用了 super().greet(),按 MRO 下一个是 A(不是 B,因为 B.greet 没 super())

思路解析:

  • MRO(Method Resolution Order) 使用 C3 线性化算法,规则是:从左到右、深度优先、但保证每个父类只出现一次且在子类之后。

  • class D(B, C) 的 MRO 是 D → B → C → A → object。B 在 C 之前,因为声明顺序是 (B, C)。

  • d.show() 返回 "B.show":D 没有 show(),按 MRO 找到 B 的 show()。

  • d.greet() 的调用链:

    • D.greet()打印 "D.greet",然后 super().greet()

    • MRO 中 D 的下一个是 B,所以调用 B.greet()

    • B.greet() 只打印 "B.greet",没有 super().greet(),调用链到此结束

  • 改为 class D2(C, B) 后,MRO 变成 D2 → C → B → A → object,show() 和 greet() 的行为都会改变。

  • 核心要点:super() 不是「调用父类」,而是「调用 MRO 中的下一个类」。在多继承中,super() 的目标取决于当前类在 MRO 中的位置。

    建议的练习方式

    1. 先自己写——不看答案,能写多少写多少

    2. 卡住了回看文章——第 2 篇对应章节有完整示例

    关注「拙见python」,一起写干净的代码。


    下一篇预告:Python 面向对象习题之7/10

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    1. CONNECT:[ UseTime:0.001039s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001472s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000662s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000630s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001316s ]
    6. SELECT * FROM `set` [ RunTime:0.000555s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001506s ]
    8. SELECT * FROM `article` WHERE `id` = 956096 LIMIT 1 [ RunTime:0.001037s ]
    9. UPDATE `article` SET `lasttime` = 1787320317 WHERE `id` = 956096 [ RunTime:0.002460s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000689s ]
    11. SELECT * FROM `article` WHERE `id` < 956096 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001154s ]
    12. SELECT * FROM `article` WHERE `id` > 956096 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001150s ]
    13. SELECT * FROM `article` WHERE `id` < 956096 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018140s ]
    14. SELECT * FROM `article` WHERE `id` < 956096 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.040521s ]
    15. SELECT * FROM `article` WHERE `id` < 956096 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003087s ]
    0.259493s