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小白学python第57天之函数递归(难点重点)(2)

  • 2026-02-05 00:43:10
小白学python第57天之函数递归(难点重点)(2)

2.2

函数递归(难点重点)(2)

?

学前疑问

面对一个复杂的大问题,我们常说要“化整为零”。但Python的递归函数把它做到了极致:它把问题不断分解,直到变成一个个完全相同的、最简单的小问题。你觉得,这个“最简单的小问题”在递归中扮演着什么关键角色?

1

编写递归三步走

(1)明确你这个函数想要干什么

如:求斐波那契数列

(2)寻找递归结束条件

如:就是在什么情况下,递归会停止循环,返回结果

(3)找出函数的等价关系式

如:斐波那契数列,第n位 f(n) = f(n-1) + f(n-2)

案例1:使用递归求斐波那契数列:

第一步:明确这个函数想要干什么(先定义出来,明确调用方式)

# 斐波拉契数列:1、1、2、3、5、8、13、21...def f(n):    # 编写递归代码求第n位的结果# 调用函数print(f(15))

第二步:寻找递归的结束条件

# 斐波拉契数列:1、1、2、3、5、8、13、21...def f(n):    # 编写递归代码求第n位的结果    if n ==1or n == 2:        return1# 调用函数print(f(15))

第三步:找出函数的等价关系式(最关键的一步)

# 斐波拉契数列:1、1、2、3、5、8、13、21...def f(n):    # 编写递归代码求第n位的结果    if n ==1or n == 2:        return1    return f(n-1) + f(n-2)# 调用函数print(f(15))

案例2:使用递归求N的阶乘(如n=100)

阶乘是什么?一个正整数的阶乘(factorial)是所有小于及等于该数的正整数的积,如:n!=1×2×3×...×(n-1)×n

1! = 1

2! = 1x2 = 2

3! = 1x2x3 = 6

4! = 1x2x3x4 = 24

...

n!=1×2×3×...×(n-1)×n

第一步:明确这个函数要做什么以及定义函数以及调用方式

def f(n):    # 编写递归条件print(f(100))

第二步:寻找递归的结束条件

def f(n):    # 编写递归结束条件    if n == 1:        return1    # ...递归等式print(f(100))

第三步:编写递归等价公式(自己要调用自己)

等价公式 = 找规律

1! = f(1) = 1

2! = f(2) = 2

3! = f(2)x3 = 6

4! = f(3)x4 = 24

...

n!= f(n-1) * n

def f(n):    # 编写递归结束条件    if n == 1:        return1    # ...递归等式    return f(n-1) * nprint(f(100))

案例3:面试题 => 猴子吃桃问题

猴子吃桃问题:猴子第1天摘下若干个桃子,当即吃了一半,还不过瘾,又多吃了一个。第2天早上又将剩下的桃子吃掉一半,又多吃了一个。以后每天早上都吃了前一天剩下的一半另加一个。到第10天早上想再吃时,就只剩下一个桃子了。求第1天共摘了多少个桃子?

第一步:确定函数主要要完成什么功能,需要传递哪些参数,确认调用方式

分析:

f(10) = 1

f(9) = (f(10)+1)*2 = 4

f(8) = (f(9)+1)*2 = 10

f(7) = (f(8)+1)*2 = 22

...

f(n) = (f(n-1)+1)*2

1:1

2:4    f(2)=(f[1]+1)*2

3:10

...

f(10)=(f[9]+1)*2

递推版本:

def apples(n):    if n == 1:        return1    dict1 = {1:12:4}    for i in range(2, n+1):        dict1[i] = (dict1[i-1]+1) * 2    return dict1[n]print(apples(10))

递归版本:

# 第一步:确定函数功能def f(n):    # 第二步:编写递归结束条件(出口)    if n == 10:        return1    # 第三步:寻找与这个问题相似的等价公式    return (f(n+1) + 1) * 2# 调用函数print(f(1))

(缺点,n=1000时,数据会过大,导致程序报错,可以尝试

from functools import lru_cache

@lrc_cache)

今日学习完毕,课后作业:

请编写一个名为 factorial(n)的递归函数,计算并返回非负整数 n的阶乘。

阶乘的定义如下:

(1)如果 n为 0 或 1,则 n! = 1。(这是递归的基准情况)

(2)如果 n大于 1,则 n! = n * (n-1)!。(这是递归的递推关系)

要求:

①函数必须使用递归实现。

②处理输入为 0 的情况。

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  1. CONNECT:[ UseTime:0.001091s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001541s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000656s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000665s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001283s ]
  6. SELECT * FROM `set` [ RunTime:0.000875s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001495s ]
  8. SELECT * FROM `article` WHERE `id` = 471925 LIMIT 1 [ RunTime:0.001033s ]
  9. UPDATE `article` SET `lasttime` = 1770471789 WHERE `id` = 471925 [ RunTime:0.004319s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000645s ]
  11. SELECT * FROM `article` WHERE `id` < 471925 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002926s ]
  12. SELECT * FROM `article` WHERE `id` > 471925 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002119s ]
  13. SELECT * FROM `article` WHERE `id` < 471925 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003763s ]
  14. SELECT * FROM `article` WHERE `id` < 471925 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010371s ]
  15. SELECT * FROM `article` WHERE `id` < 471925 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005690s ]
0.202954s