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Python三变量交换案例|新手必练 | 直接套用(可复制源码)

  • 2026-07-02 18:17:44
Python三变量交换案例|新手必练 | 直接套用(可复制源码)

今天给大家分享一道超经典的Python三变量赋值交换练习题,也是院校高频基础作业题!全程大白话讲解、无难懂术语,源码完整可直接复制,零基础小白也能轻松吃透,拿来练手、交作业都合适!


📌 实操原题

初始化三个基础变量数值:a = 100、b = 200、c = 300

练习要求

完成数值轮换交换,规则固定:原a值赋值给c、原b值赋值给a、原c值赋值给b,最后在控制台打印出交换后的所有结果。

数值变化对照

✅ 交换前:a=100  b=200  c=300

✅ 交换后:a=200  b=300  c=100


新手常见错误误区

大部分新手做这道题都会出错:直接修改变量数值,最后数据全部错乱。

原因特别易懂:变量的数字是一次性的,一旦填入新数字,原本的旧数据就会直接消失,没有提前保存,交换自然失败。

零基础通用解法:先备份全部原始数值,再做数值交换,零报错、百分百成功!


💻 完整可运行源码(原题原版)

完全贴合题目要求,注释和原题规则一一对应,可直接复制运行、提交作业:

# 定义初始三个变量,标注赋值对应规则a = 100 # c = 100b = 200 # a = 200c = 300 # b = 300# 临时备份原始数值(核心步骤,避免数据丢失)temp_a = atemp_b = btemp_c = c# 按题目规则完成变量数值交换a = temp_bb = temp_cc = temp_a# 控制台输出最终结果print(a)print(b)print(c)


 超通俗逐行拆解(小白专属)

1、初始化基础变量

给a、b、c三个变量设置固定数值,同时标注好每个原始数值最终对应的赋值变量,严格贴合题目要求。

2、备份原始数据

借助临时变量,把三个初始数值完整保存下来。后续不管怎么修改a、b、c的数值,最开始的原始数据都不会丢失,从根源规避报错。

3、完成数值轮换

调用提前备份好的数据,精准完成题目要求的轮换赋值:

  • 全新a = 原b数值(200)

  • 全新b = 原c数值(300)

  • 全新c = 原a数值(100)

4、打印验证结果

通过打印语句,依次输出交换后的变量数值,快速核对代码是否编写正确。


✅ 标准运行结果

代码运行后,控制台输出正确答案,完全符合练习预期:

200300100


📌 新手练手小结

  • 多变量交换核心技巧:先备份、后赋值,杜绝数据覆盖出错

  • 临时变量写法简单易懂,适配新手练手、课堂作业、考试

  • 基础小题反复练习,快速积累Python实操手感


这道Python基础三变量交换实操题,是入门阶段必刷的经典题型,非常适合自学Python自动货办公新手日常打卡练手。看似简单,却能帮大家吃透变量赋值的核心逻辑,为后续学习打下扎实基础。

本文分享的是零报错的标准基础写法,也是老师最推荐的作业写法!其实Python还有更精简的独家技巧,无需临时变量,一行代码就能完成三变量交换,高效又高级。

想要解锁进阶极简代码、领取全套Python新手基础练习题单?点赞+收藏+评论“进阶”,下期优先更新干货教程,带你轻松摆脱入门瓶颈!

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  1. CONNECT:[ UseTime:0.001184s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001640s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002199s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004091s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001494s ]
  6. SELECT * FROM `set` [ RunTime:0.000605s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001812s ]
  8. SELECT * FROM `article` WHERE `id` = 503055 LIMIT 1 [ RunTime:0.011329s ]
  9. UPDATE `article` SET `lasttime` = 1783000648 WHERE `id` = 503055 [ RunTime:0.016965s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000833s ]
  11. SELECT * FROM `article` WHERE `id` < 503055 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001896s ]
  12. SELECT * FROM `article` WHERE `id` > 503055 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001454s ]
  13. SELECT * FROM `article` WHERE `id` < 503055 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002225s ]
  14. SELECT * FROM `article` WHERE `id` < 503055 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002481s ]
  15. SELECT * FROM `article` WHERE `id` < 503055 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002472s ]
0.234494s