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9_Python_函数递归/列表推导式和生成器

  • 2026-07-01 20:44:53
9_Python_函数递归/列表推导式和生成器

一、函数递归

1.概念

递归函数:一个会调用自身的函数【在一个函数的内部,自己调用自己】

递归调用

递归中包含了一种隐式的循环,他会重复指定某段代码【函数体】,但这种循环不需要条件控制

使用递归解决问题思路:

a.找到一个临界条件【临界值】

b.找到相邻两次循环之间的关系 

c.一般情况下,会找到一个规律【公式】

2.使用

代码演示:

# 函数自己调用自己就是递归
# 需求:通过递归的方式,封装一个函数,计算 n! (n是传入的数字)


# 5! ===> 5*4*3*2*1==>5 * 4!
# 4! ===> 4*3*2*1 ===>4 * 3!
# 3! ===> 3*2*1====>  3 * 2!
# 2! ===> 2*1  ===>   2 * 1!
# 1! ===> 1

#总结如下:
# n! = n * (n-1)!
'''
a.找到一个临界值(临界条件)   1! = 1
b.找到两个循环之间的关系
c.总结规律: n! = n * (n-1)!
'''
defdigui(n):
ifn==1:
return1
returnn*digui(n-1)
print(digui(6))


# 通过递归封装一个函数,传入一个数字m,得到第m个斐波那契数列
# 1 1 2 3 5 8 13 21 34 55 89
deffn(m):
ifm<3:
return1
returnfn(m-1+fn(m-2)
print(fn(8))

注意:以后在实际项目中尽量少用递归,如果隐式循环的次数太多,会导致内存泄漏【栈溢出】  python默认的递归次数限制为1000次左右.以免耗尽计算机的内存.

优点:简化代码,逻辑清晰

二、列表推导式和生成器

1.列表生成式/列表推导式 

list comprehension

系统内置的用于创建list的方式

range(start,end,step)缺点:生成的列表一般情况下都是等差数列

代码演示:

# 最基本的列表
# 1.生成1-10之间所有的数字
list1=list(range(1,11))
print(list1)

# 需求:通过程序的方式生成列表 [1,4,9,16,25]
#第一种方法:使用原始的方式生成
list2= []
foriinrange(1,6):
list2.append(i**2)
print(list2)

# 第二种方法:使用列表生成式
list3= [i**2foriinrange(1,6)]
print(list3)   # [1, 4, 9, 16, 25]

# 使用列表生成式 生成1-10之间所有的奇数
list4= [iforiinrange(1,11ifi%2==1]
print(list4)

# 使用列表生成式 生成1-10之间所有的奇数并且能被3整除的数字
list5= [iforiinrange(1,11ifi%2==1andi%3==0]
print(list5)

# 列表生成式中使用双重循环
list6= [i+jforiin"xyz"forjin"987"]
print(list6)

# 字典生成式:(了解)
dict1= {i:i*iforiinrange(1,6)}
print(dict1)

# 集合生成式:(了解)
set1= {i*iforiinrange(1,6)}
print(set1)

2.生成器

generator

next()

代码演示:

# 定义生成器: 只需要把列表生成式的[] 换成() 即可
g= (i**2foriinrange(1,10))
print(g)
print(type(g))  #<class 'generator'>

# 生成器得到的数据不能直接输出,要想访问里面的数据,必须使用next() 进行遍历,每调用一次next() 就会输出一个数据
print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))
print(next(g))

# 当通过next() 将生成器中的数据遍历完毕以后,接着调用next(),就会出现StopIteration
# print(next(g))   # StopIteration

# 生成器的应用场景:
'''
当需要生成无穷多的数据时,一般使用生成器. 若使用列表生成无穷多的数,会占用大量的空间,不合适.
'''

# 生成器相关的函数 yield
'''
1.yield存在于函数中,当普通函数中有了yield关键词,该普通函数变为了生成器函数.
2.调用生成器函数不会执行代码,需要使用next
3.可以在函数的内部不断地返回值,但是不会终止函数的执行(与return不同)
4.每次调用next以后,程序会在yield处暂停
'''

deftest(m):
print("m=",m)
yieldm*2
print("m+1=",m+1)
yield (m+1*2
print("m+2",m+2)

g=test(23# 在普通函数test中加入了关键字yield,那该函数变成了生成器函数,直接调用不会执行.
print(type(g))   # <class 'generator'>
print(next(g))    # 函数执行到第一个yiled处暂停
print(next(g))    # 函数执行到第二个yiled处暂停

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  1. CONNECT:[ UseTime:0.000706s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001100s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000398s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000619s ]
  6. SELECT * FROM `set` [ RunTime:0.000238s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000857s ]
  8. SELECT * FROM `article` WHERE `id` = 488465 LIMIT 1 [ RunTime:0.001633s ]
  9. UPDATE `article` SET `lasttime` = 1783139356 WHERE `id` = 488465 [ RunTime:0.001986s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000242s ]
  11. SELECT * FROM `article` WHERE `id` < 488465 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000775s ]
  12. SELECT * FROM `article` WHERE `id` > 488465 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.018666s ]
  13. SELECT * FROM `article` WHERE `id` < 488465 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009371s ]
  14. SELECT * FROM `article` WHERE `id` < 488465 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008970s ]
  15. SELECT * FROM `article` WHERE `id` < 488465 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009827s ]
0.200704s