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每日Python面试题 · 第1期

2026-06-27 13:43:23

每日Python面试题 · 第1期

程序员的世界只有两种状态：‘我写的代码真牛逼’ 和 ‘这是谁写的狗屎？’——而这两者通常只差一夜没睡。

今日面试题

a = [[]]*3a[0].append(1)print(a)

别急着往下滑，先自己猜猜，不然看答案的你也只是个‘复制人’。

🧠 正确答案 & 思路解析

[[1], [1], [1]]

技术知识点穿插讲解：

*3 复制的是引用而非独立对象
append 操作作用在同一个子列表引用上

🛠 延伸思考/进阶版

a = [[ ]] + [[ ]] + [[ ]]a[0].append(9)print(a)

“这次你还敢说一样吗？小心，被浅复制骗过一次是新手，被骗两次，那你就是我兄弟。”

明日话题 teaser：
“明天的题目涉及 is 和 ==，告诉你什么叫‘看起来像双胞胎，实则互相不认识’。”

“看懂了吗？看不懂也没关系，转发给朋友装作你懂了就行。”

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CONNECT:[ UseTime:0.000432s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000604s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004546s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002250s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.000723s ]
SELECT * FROM `set` [ RunTime:0.001336s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.000585s ]
SELECT * FROM `article` WHERE `id` = 498357 LIMIT 1 [ RunTime:0.002524s ]
UPDATE `article` SET `lasttime` = 1783032100 WHERE `id` = 498357 [ RunTime:0.003148s ]
SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000328s ]
SELECT * FROM `article` WHERE `id` < 498357 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000453s ]
SELECT * FROM `article` WHERE `id` > 498357 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000357s ]
SELECT * FROM `article` WHERE `id` < 498357 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.017104s ]
SELECT * FROM `article` WHERE `id` < 498357 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010998s ]
SELECT * FROM `article` WHERE `id` < 498357 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.038611s ]

0.155065s

ShowPageTrace