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【编程一点通】Python 里的“皮囊”与“灵魂”:为什么 80% 的人都分不清 is 和 ==?

  • 2026-06-28 15:52:48
【编程一点通】Python 里的“皮囊”与“灵魂”:为什么 80% 的人都分不清 is 和 ==?

20

26

从一个编程

最简单的知识讲起

01

第一眼,你就看错了?

四月,春和景明。当你在苏科大的石湖校区漫步,看到两棵开得一模一样的樱花树时,你会说它们“相等”,还是说它们是“同一个”?

在编程的世界里,初学者最容易踩下的“雷区”,莫过于分不清 is 与 ==。看起来一模一样的东西,本质上可能天差地别。 今天,校科协新传部带你深入 Python 的底层逻辑,拆解这场关于“皮囊”与“灵魂”的终极辩论。

02

硬核科普:皮囊相等,

还是灵魂同一?

【皮囊】==:值的“平等协议”

定义: 比较两个对象的内容(Value)是否相等。

生活化理解: 就像两部同型号、同内存、同颜色的手机,它们在参数上是“完全相等”的。你用其中一部看网课,另一部不会产生任何记录。

结论: 只要“长得一样”,== 就会给你一个肯定的 True。

【灵魂】is:内存的“唯一标识”

定义: 比较两个对象的身份(Identity)是否相同,即是否指向同一块内存地址。

生活化理解: 无论你给这台手机贴上“学习机”的标签,还是叫它“刷剧神器”,它本质上就是那一台设备。

结论: 只有当两个变量指向同一个灵魂(内存 ID)时,is 才会认可它们的同一性。

03

 深度排雷:那些

 让你头秃的“意外”

案例:神秘的“小整数池”

你知道吗?Python 为了优化性能,会提前把 -5 到 256 之间的整数放在一个“小房间”里。当你调用它们时,大家共用同一个地址;但一旦超过这个界限,Python 就会为每个新数字开辟新房间。这就是为什么,即便数值相等,它们的“灵魂”却可能各奔东西。

04

互动挑战:谁才是

真正的“逻辑鬼才”?

光说不练假把式。校科协为你准备了三道“排雷模拟题”,请在评论区留下你的答案:

Q1. 运行以下代码,结果是什么?

Q2. 运行以下代码,结果是什么?

Q3. 为什么在判断 a is None 时,从来不用 a == None?

05

抛出你的“第一块砖”

我们之所以纠结于 is 与 == 的区别,是因为在数字世界里,精准即是美德。

跨界学习编程,不仅仅是学会写几行指令,更是为了培养一种“透过表象看本质”的严谨思维。四月的春光里,希望这篇“排雷指南”能成为你抛向未知领域的首块砖。

别怕报错,别怕踩雷。每一次 False 的背后,都藏着通往 True 的逻辑钥匙。

                                      (资料来源:科普中国网)

       |编辑:徐甜甜

|审核:王宝 李思远 郑金屿 潘菲芸 顾静怡

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  1. CONNECT:[ UseTime:0.000470s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000778s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000289s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000275s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000246s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000631s ]
  8. SELECT * FROM `article` WHERE `id` = 488430 LIMIT 1 [ RunTime:0.002259s ]
  9. UPDATE `article` SET `lasttime` = 1783123948 WHERE `id` = 488430 [ RunTime:0.018024s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000448s ]
  11. SELECT * FROM `article` WHERE `id` < 488430 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000645s ]
  12. SELECT * FROM `article` WHERE `id` > 488430 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001229s ]
  13. SELECT * FROM `article` WHERE `id` < 488430 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001393s ]
  14. SELECT * FROM `article` WHERE `id` < 488430 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004524s ]
  15. SELECT * FROM `article` WHERE `id` < 488430 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001118s ]
0.107800s