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【Python小白速通】递归?说白了就是"代码界的套娃游戏"!

  • 2026-02-07 09:40:28
【Python小白速通】递归?说白了就是"代码界的套娃游戏"!

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【Python小白速通】递归?说白了就是"代码界的套娃游戏"!

咱之前唠的函数都是"干完就撤",比如算奶茶总价、泡咖啡,一次调用一次搞定。但有些活儿得"拆成小活儿干"——比如算10的阶乘(10×9×8×…×1)、找文件夹里所有文件,直接算太麻烦,这时候**递归**就登场了!

简单说,递归就是"函数自己喊自己干活",像玩套娃:打开一个套娃,里面还有个小套娃,再打开小套娃,里面还有更小的…直到开到最小的那个,再一层层往回走,主打一个"大事化小,小事化了"~

一、先唠透:啥是递归?(纯人话版)

先掰碎了说,不整专业术语:

- 递归函数:一个函数在自己的代码里,又调用了自己,比如`def count_down(n): count_down(n-1)`;

- 核心逻辑:把复杂问题拆成"和原问题一样,但规模更小"的子问题,比如算10!拆成10×9!,算9!拆成9×8!…直到拆到1!(1),再往回算;

- 两个关键:① 递归出口(最小的那个"套娃底",比如1! = 1);② 递归公式(拆分成更小问题的规则,比如n! = n×(n-1)!)。

举个栗子:你想数清一个套娃里有多少层,做法是:

1. 先看当前套娃里有没有更小的套娃(递归调用自己);

2. 直到摸到最里面的小娃娃(递归出口);

3. 再一层层往回数:"最里面1层+外面这层=2层,再加外面…=总层数"——这就是递归的核心!

二、实操!3种递归用法,小白也能秒会

递归的关键是"找出口+找公式",咱从最简单的"倒计时"开始,代码都标了"人话注释",复制就能跑~

姿势1:最基础的递归(倒计时版)

比如从5数到1,用递归实现,新手先拿捏这个"套娃逻辑"!

python

#定义递归函数:倒计时

def count_down(n):

    # 递归出口:数到0就停,这是"套娃底"!

    if n == 0:

        print("🎉 倒计时结束!")

        return

    # 先打印当前数字

    print(f"⏰ {n}")

    # 递归调用自己:数比当前小1的数(拆成更小的问题)

    count_down(n - 1)

#调用函数:从5开始倒计时

count_down(5) 

👉 运行结果:

⏰ 5

⏰ 4

⏰ 3

⏰ 2

⏰ 1

🎉 倒计时结束!

姿势2:递归算阶乘(实用款)

阶乘是递归的经典场景,比如5! = 5×4×3×2×1,用递归拆成"5×4!",4!拆成"4×3!"…直到1! = 1!

python

#定义递归函数:计算n的阶乘

def factorial(n):

    # 递归出口:1的阶乘是1,0的阶乘也是1(固定规则)

    if n == 0 or n == 1:

        return 1

    # 递归公式:n! = n × (n-1)!

    return n * factorial(n - 1)

#调用函数:算5的阶乘

result = factorial(5)

print(f"✅ 5的阶乘是:{result}")

👉 运行结果:

✅ 5的阶乘是:120

姿势3:递归算斐波那契数列(进阶版)

斐波那契数列:1,1,2,3,5,8…(从第3项开始,每一项=前两项之和),用递归拆超简单!

python

#定义递归函数:算斐波那契数列第n项

def fibonacci(n):

    # 递归出口:第1、2项都是1

    if n == 1 or n == 2:

        return 1

    # 递归公式:第n项 = 第n-1项 + 第n-2项

    return fibonacci(n - 1) + fibonacci(n - 2)

#调用函数:算第6项

result = fibonacci(6)

print(f"✅ 斐波那契数列第6项是:{result}")

👉 运行结果:

✅ 斐波那契数列第6项是:8

三、避坑小彩蛋:新手最容易踩的3个坑

1. 漏写递归出口=无限套娃:没写`if n==0:`这种出口,函数会一直调用自己,像套娃没有底,直到Python"累趴"(报RecursionError)!比如只写`def count_down(n): count_down(n-1)`,Python会喊:"我数到负数了,还没底?不干了!"

2. 递归深度别超标:Python默认递归深度约1000层,比如想数到10000,直接递归会报错,像套娃套了10000层,手都拆酸了~(解决:简单活递归,超深活用循环)

3. 别用递归干简单活:比如算1+2+3+…+100,用递归不如用循环,递归会额外占用内存,像用套娃装苹果,不如直接用篮子装省事~

四、递归vs循环(大白话对比)

| 特点 | 递归(套娃)| 循环(绕圈)|

|------|------------|------------|

| 代码风格 | 简洁优雅,符合"拆问题"逻辑 | 稍繁琐,但更直观 |

| 内存占用 | 高(每层调用都占内存)| 低(仅占少量内存)|

| 适用场景 | 问题能拆成"同类型小问题"(阶乘、斐波那契、文件遍历) | 简单重复操作(倒计时、求和) |

| 新手友好度 | 低(容易漏出口)| 高(逻辑简单)|

总结

1. Python递归核心是"函数调用自己",必须有递归出口(套娃底)和递归公式(拆小问题规则);

2. 递归适合解决"可拆分成同类型小问题"的场景(阶乘、斐波那契、文件遍历),简单重复活优先用循环;

3. 记住"别漏出口、别超深度、别瞎用递归",能避开90%的递归坑。

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  1. CONNECT:[ UseTime:0.000760s ] 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:0.000322s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000631s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000734s ]
  8. SELECT * FROM `article` WHERE `id` = 474099 LIMIT 1 [ RunTime:0.000428s ]
  9. UPDATE `article` SET `lasttime` = 1770438138 WHERE `id` = 474099 [ RunTime:0.011078s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001374s ]
  11. SELECT * FROM `article` WHERE `id` < 474099 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000727s ]
  12. SELECT * FROM `article` WHERE `id` > 474099 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000559s ]
  13. SELECT * FROM `article` WHERE `id` < 474099 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003499s ]
  14. SELECT * FROM `article` WHERE `id` < 474099 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001009s ]
  15. SELECT * FROM `article` WHERE `id` < 474099 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000822s ]
0.100529s