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解锁Python高效循环技巧:告别低效代码,掌握for、while循环优化,让你的程序更快更强!

  • 2026-02-06 10:53:09
解锁Python高效循环技巧:告别低效代码,掌握for、while循环优化,让你的程序更快更强!
这次咱们聊聊Python循环的那些事儿。循环,是编程里躲不开的话题,能让电脑重复干活。但循环写不好,效率就低。这次就专门攻克forwhile循环的优化,目的就是让你的Python代码跑得溜溜的!我们会扒一扒循环的基本操作,还会搞懂一些提速的小技巧,比如列表推导式等。

循环基础:for和while

for循环和while循环,就像是两条腿走路,都能实现循环的功能,但是应用场景不太一样。

for循环,主要用在你知道要循环多少次的情况。比如,遍历一个列表:

fruits = ["apple""banana""cherry"]
for fruit in fruits:
print(fruit)

这代码,会把列表里的每个水果都打印出来。fruit这玩意儿,就是个变量,每次循环,它都会指向列表里的下一个元素。

while循环,适合你不知道要循环多少次,直到满足某个条件才停的情况。比如:

count = 0
while count < 5:
print(count)
    count = count + 1

这段代码会打印0到4。只要count小于5,循环就一直跑。一定要记得更新count的值,要不然就死循环了!

循环提速大法:告别蜗牛速

循环写起来简单,但是效率是个大问题。特别是数据量大了以后,稍微不注意,代码就卡成PPT。所以,优化循环很重要!

# 列表推导式:一行代码搞定循环

列表推导式,是个好东西,能让你用一行代码就搞定循环和列表创建。比如,你要创建一个包含0到9的平方的列表,普通循环是这样的:

squares = []
for i inrange(10):
    squares.append(i * i)
print(squares)

用列表推导式,就一行:

squares = [i * i for i inrange(10)]
print(squares)

是不是简洁多了?而且,列表推导式通常比普通循环快。

# 使用生成器:省内存,速度快

生成器,是个更高级的玩意儿。它不会一次性把所有结果都算出来,而是用到的时候才算。这在处理大数据的时候,能省不少内存。

defsquare_generator(n):
for i inrange(n):
yield i * i

for square in square_generator(10):
print(square)

这里,square_generator就是一个生成器函数。它用yield关键字来返回一个值,而不是用return。每次循环,它才会计算下一个平方数。

温馨提示:生成器只能用一次,用完了就没了。

# 避免在循环里做重复计算

有些计算,其实在循环外就可以搞定,没必要每次都算一遍。比如:

length = len(my_list)
for i inrange(length):
print(my_list[i])

这里,len(my_list)只算一次就够了。

# 善用内置函数:能偷懒就偷懒

Python有很多内置函数,比如mapfilter,它们通常都比自己写的循环快。

map函数,能对一个序列里的每个元素都执行一个函数:

numbers = [12345]
squared_numbers = list(map(lambda x: x * x, numbers))
print(squared_numbers)

filter函数,能过滤掉序列里不符合条件的元素:

numbers = [12345]
even_numbers = list(filter(lambda x: x % 2 == 0, numbers))
print(even_numbers)

这些内置函数,底层通常都是用C语言实现的,速度比Python循环快多了。

# 优化while循环条件:减少不必要的判断

while循环的条件,也会影响效率。尽量让条件简单明了,避免复杂的计算。

错误示范:

i = 0
while i < len(my_list) and my_list[i] != target:
    i += 1

如果i已经超出了列表的范围,my_list[i]就会报错。应该先判断i是否越界。

# Numba加速:终极提速方案

如果上面的方法还不够快,可以试试Numba。Numba是一个即时编译器,能把Python代码编译成机器码,速度提升非常明显。

from numba import njit

@njit
defmy_loop(n):
    result = 0
for i inrange(n):
        result += i
return result

print(my_loop(10000000))

只需要在函数上面加个@njit装饰器,Numba就会自动把这个函数编译成机器码。第一次运行会慢一点,因为要编译,但是后面就会快很多。

实战演练:优化一个复杂循环

假设我们要计算一个列表里所有正数的平方和。用普通循环是这样的:

numbers = [-2, -10123]
sum_of_squares = 0
for number in numbers:
if number > 0:
        sum_of_squares += number * number
print(sum_of_squares)

用列表推导式和sum函数,可以这样写:

numbers = [-2, -10123]
sum_of_squares = sum([number * number for number in numbers if number > 0])
print(sum_of_squares)

这样代码更简洁,效率也更高。

一些小建议:平时写代码的时候,多想想有没有更高效的写法。可以多看看别人的代码,学习他们的技巧。

循环之外:其他优化思路

除了优化循环本身,还可以考虑其他的优化思路。比如,用并行计算来加速循环,或者用更高效的数据结构来存储数据。这些都超出这次的范围了,以后有机会再聊。

Python循环优化,是个持续学习的过程。希望这些技巧能帮助你写出更高效的Python代码。 记住,纸上得来终觉浅,绝知此事要躬行!

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  1. CONNECT:[ UseTime:0.000599s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000709s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006540s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000379s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000498s ]
  6. SELECT * FROM `set` [ RunTime:0.000736s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000594s ]
  8. SELECT * FROM `article` WHERE `id` = 468893 LIMIT 1 [ RunTime:0.013684s ]
  9. UPDATE `article` SET `lasttime` = 1770473469 WHERE `id` = 468893 [ RunTime:0.001673s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000284s ]
  11. SELECT * FROM `article` WHERE `id` < 468893 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005494s ]
  12. SELECT * FROM `article` WHERE `id` > 468893 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001439s ]
  13. SELECT * FROM `article` WHERE `id` < 468893 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008324s ]
  14. SELECT * FROM `article` WHERE `id` < 468893 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.121103s ]
  15. SELECT * FROM `article` WHERE `id` < 468893 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.121321s ]
0.351612s