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从小练逻辑!超易懂Python条件嵌套教程

  • 2026-06-28 09:57:47
从小练逻辑!超易懂Python条件嵌套教程

哈罗,各位大朋友小朋友们!之前我们带孩子们一起收服了 if(如果)、else(否则)和 elif(或者)这三位大管家。现在的电脑在孩子手里,已经能像模像样地做各种单项选择题了。

但是,生活里的考验往往是一环扣一环的。比如:如果今天放假,并且如果外面不下雨,我们才出去踢球。这就意味着,必须先满足“放假”这个大前提,才能接着去判断“下不下雨”。

这种“大要求里面还套着小要求”的连环计,在编程里该怎么写呢?今天我们就来解锁分支结构里的终极招式——条件语句嵌套

🪆 什么是嵌套?其实就是代码版的“俄罗斯套娃”

“嵌套”这个词听起来挺深奥,其实大白话解释,就是把一个东西塞进另一个东西里面

生活里这种现象随处可见,孩子们一眼就能明白:

  • 多层花架: 大花架里面塞着小花架。

  • 多层蛋糕: 大蛋糕底座上落着小蛋糕。

  • 俄罗斯套娃: 剥开一个大娃娃,里面竟然还藏着一个一模一样的小娃娃!

在 Python 的世界里,条件语句嵌套,就是在一个 if 语句块的内部,又塞进去了一个新的 if 语句。只有当外层的大 if 顺利闯关成功,电脑才会激活内层的小 if 机关。

根据不同的需要,大 if 里面不仅可以套单独的 if,还可以套 if...else 或者 if...elif...else。反正只要你愿意,可以像套娃一样一层一层往下套!

📐 逼死强迫症的排版规矩:缩进再缩进!

还记得我们之前说过的 “4个空格缩进” 铁律吗?那可是 Python 王国的通行证。

一旦玩起了“套娃嵌套”,这个缩进规矩就会变得更有趣(也更容易踩坑):

  1. 外层的大 if 顶格写,它下面的小弟要缩进 4个空格

  2. 作为小弟之一的内层小 if,也是顶着这 4个空格的线写的。

  3. 那么,归内层小 if 管的代码,就必须在小 if 的基础上再缩进 4个空格(也就是整整 8个空格!)

代码看起来就像楼梯一样,一层一层往右斜。排版一旦乱了,电脑就会彻底迷路,不知道谁是谁的小弟了。

💻 实战演练:写一个连环数字侦探程序

光说不练假把式,我们用代码来实现一个数学小侦探的功能:

  • 第一步(大前提): 输入两个数字 $a$ 和 $b$,先判断 $a$ 是不是大于 $b$

  • 第二步(连环计): 如果 $a$ 确实大于 $b$,先帮它们算个减法;在此基础上,再瞅瞅 $a$ 能不能把 $b$ 整除,如果能,就再算个除法!

在 PyCharm 里,带孩子敲下这段精妙的套娃代码:

a = float(input('请输入数字a'))
b = float(input('请输入数字b'))

外层大管家:大前提是 a 必须大于 b
if a > b:
print('a-b ='a - b)  外层if的小弟,缩进4个格
内层小管家:在 a > b 的安全区里,再次发起判断!
if a % b == 0:  也是缩进4个格,和上面的print对齐
print('a/b ='a / b)  核心小弟!缩进8个格!只有外层内层都通关,才会执行它!
游戏测试时间:
  • 情况一: 输入 $a = 10, b = 2$。因为 10 > 2,大前提成立!电脑打印出 a-b = 8;接着触发内层判断,10 能被 2 整除,内层也成立!电脑又打印出 a/b = 5。两个愿望一次满足!

  • 情况二: 输入 $a = 10, b = 3$。10 > 3 大前提成立,打印 a-b = 7。但 10 不能被 3 整除,内层机关没触发。程序到此结束。

  • 情况三: 输入 $a = 2, b = 5$。因为 2 不大于 5,大前提直接失败!电脑冷酷地撇了一眼,后面的连环计代码看都不看,直接收工。

📝 条件语句终极毕业卡

学到这里,恭喜孩子们!Python 分支结构(也就是条件判断)的全部核心大招,你们已经彻底通关了:

  • 想做单向选择?用 if

  • 想做双向二选一?用 if...else

  • 想做多项连环选?用 if...elif...else

  • 想做大局里的细节把控?用条件语句嵌套

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  1. CONNECT:[ UseTime:0.000456s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000861s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008012s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007335s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000856s ]
  6. SELECT * FROM `set` [ RunTime:0.021397s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001045s ]
  8. SELECT * FROM `article` WHERE `id` = 500473 LIMIT 1 [ RunTime:0.112704s ]
  9. UPDATE `article` SET `lasttime` = 1783006220 WHERE `id` = 500473 [ RunTime:0.021819s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.016880s ]
  11. SELECT * FROM `article` WHERE `id` < 500473 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006986s ]
  12. SELECT * FROM `article` WHERE `id` > 500473 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015253s ]
  13. SELECT * FROM `article` WHERE `id` < 500473 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.051057s ]
  14. SELECT * FROM `article` WHERE `id` < 500473 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.062943s ]
  15. SELECT * FROM `article` WHERE `id` < 500473 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.043438s ]
0.442010s