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少儿编程Python笔记:别让代码只会抛硬币,用 elif 搞定多重选择题!

  • 2026-06-27 18:53:33
少儿编程Python笔记:别让代码只会抛硬币,用 elif 搞定多重选择题!

哈罗,各位大朋友小朋友们!在前面的课程中,我们带孩子们学习了 if(如果)和 if...else(如果...否则)。有了它们,电脑就能像抛硬币一样,在两种情况里做决定了。

但是,真实生活中的选择题往往不止两个选项。比如:如果明天很热我就去海边浪;如果是阴天我就去爬山;否则我就待家里。

面对这种“ABCD多选一”的复杂局面,电脑该怎么处理呢?今天,我们就来给孩子们的逻辑武器库再添一把神兵利器——if...elif...else 多重分支语句

🔀 认识新管家:elif(或者)

在 Python 王国里,elif 其实就是英文 else if 的缩写,翻译成大白话就是“或者”的意思。

当它和我们熟悉的 ifelse 强强联手时,就构成了一个完美的判断链条:“如果……或者……否则……”。程序中就是用 if...elif...else 语句来执行这些多种情况的。

这套组合拳最厉害的地方在于,elif 是可以无限分身的! 只要你有需求,你可以在中间加无数个 elif(比如:if...elif...elif...elif...else),把所有可能的情况都安排得明明白白。

📏 魔法念咒指南:这5条语法铁律必须守!

想要使唤这套高级连招,代码的书写格式必须严丝合缝:

  1. 加空格与冒号:elif 后面一定要加一个空格再写条件,条件写完后一定要加英文冒号 :

  2. 家族必须对齐:ifelif 和 else 这三位大管家,一定要在同一列上站得整整齐齐,千万不能缩进。

  3. 小弟必须缩进: 在它们下方具体要执行的指令代码(语句块),一定要打 4 个空格作为缩进,因为 4 格是规范。

  4. 层层递进: 如果条件 1 成立,电脑就执行第一件事,然后直接下班;如果条件 1 不成立,才会去看条件 2;以此类推。

  5. 老实巴交的 else: 作为最后兜底的老大,else 后面一定要加英文冒号,而且绝对不能添加任何条件语句!

💻 实战演练:打造“全自动成绩评级器”

学校里发成绩单,经常会有 A、B、C、D、E 好几个等级。规则是这样的:考试如果上了 90 分,等级就是 A,80 分以上是 B,70 分以上是 C,60 分以上是 D,否则都是 E。

我们来看看怎么用几行代码,让电脑自动帮老师评级:

score = input('请输入成绩:')      收集输入的成绩score = float(score)             转成可以比大小的小数数字if score >= 90:                  第一关:如果上了90print('成绩等级:A')elif score >= 80:                第二关:或者上了80print('成绩等级:B')elif score >= 70:                第三关:或者上了70print('成绩等级:C')elif score >= 60:                第四关:或者上了60print('成绩等级:D')else:                            终极兜底:否则(连60都没到)print('成绩等级:E')
🕵️‍♂️ 避坑小剧场:全写 
if 行不行?

有些小迷糊会偷懒:“既然都是做判断,我全用 if 不行吗?” 我们来看看如果把代码全换成 if 会发生什么灾难:

score = input('请输入成绩:')score = float(score)if score >= 90:print('成绩等级:A')if score >= 80:print('成绩等级:B')# ...后面的省略...
灾难现场模拟:
 假设孩子考了 95 分。
  • 电脑看到第一个 if,95 大于 90,屏幕喊出:A

  • 紧接着它看到了第二个独立的 if,95 也大于 80,屏幕又喊出:B

  • 结果就是,考了 95 分,屏幕上哗啦啦打印出了 A、B、C、D 四个等级,整个程序全乱套啦!

这就是 elif 的神奇之处:它是一个“排他”的过程。只要上面有一个条件满足了,电脑干完活就会自动跳过后面所有的 elif 和 else,效率极高且绝不出错!

📝 今日成就卡

到今天为止,Python 里的“三大逻辑结构”(顺序、基础选择、多重选择)孩子们已经全部拿下了:

  • 认识了新管家: 知道了 elif 就是“或者”的意思。

  • 掌握了多重选择: 能够熟练使用 if...elif...else 处理复杂的生活分类问题。

  • 逻辑思维大升级: 懂得了连环判断和独立判断的巨大区别。

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  1. CONNECT:[ UseTime:0.000378s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000661s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.012595s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008859s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000696s ]
  6. SELECT * FROM `set` [ RunTime:0.002546s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001056s ]
  8. SELECT * FROM `article` WHERE `id` = 500315 LIMIT 1 [ RunTime:0.013835s ]
  9. UPDATE `article` SET `lasttime` = 1783022041 WHERE `id` = 500315 [ RunTime:0.042394s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.008601s ]
  11. SELECT * FROM `article` WHERE `id` < 500315 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005775s ]
  12. SELECT * FROM `article` WHERE `id` > 500315 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000796s ]
  13. SELECT * FROM `article` WHERE `id` < 500315 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006044s ]
  14. SELECT * FROM `article` WHERE `id` < 500315 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.031382s ]
  15. SELECT * FROM `article` WHERE `id` < 500315 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008203s ]
0.297335s