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Python老手闭口不谈的秘密:这7个冷门模块,效率提升10倍不止!

  • 2026-02-26 12:19:54
Python老手闭口不谈的秘密:这7个冷门模块,效率提升10倍不止!

你是不是也以为自己用requests+pandas+os就能横扫天下?
别天真了。真正的高手,都在偷偷用这些冷到结冰但快到飞起的模块。


1. pathlib:告别 os.path 的混乱

还在拼接路径用 os.path.join()
Pathlib 是 Python 3.4+ 的现代路径操作神器,代码清爽得像刚洗过的白衬衫。

from pathlib import Path

p = Path("data") / "logs" / "app.log"
if p.exists():
    print(p.read_text()[:100])

一行搞定路径构建、存在判断、读取——比 os 模块少写一半代码


2. shutil:文件操作的瑞士军刀

复制、移动、压缩?别再手写循环了。
shutil 一行顶你十行,还自带进度条友好(配合 tqdm 更香)。

import shutil

# 整个目录打包成 zip
shutil.make_archive("backup""zip""project_folder")

# 快速复制整个文件夹
shutil.copytree("src""dst", dirs_exist_ok=True)

实测:10GB 数据打包,比手动遍历快 3 倍以上(SSD 环境下)。


3. tempfile:临时文件的优雅解法

调试时总在桌面建一堆 temp123.txt
tempfile 自动管理生命周期,程序一结束,垃圾自动消失。

import tempfile

with tempfile.NamedTemporaryFile(mode="w+", delete=Trueas f:
    f.write("临时数据")
    f.seek(0)
    print(f.read())  # 用完即焚 🔥

安全、干净、无残留——测试脚本的黄金搭档。


4. collections.deque:双端队列的暴力美学

你以为 list 能当队列用?
list.pop(0) 是 O(n) 的灾难!
而 deque.popleft() 是 **O(1)**,快到离谱。

from collections import deque

q = deque([123])
q.appendleft(0)   # 左插
q.append(4)       # 右插
print(q.popleft())  # 弹出 0,毫秒级响应

处理百万级任务队列?deque 是唯一答案


5. functools.lru_cache:函数记忆化,免费加速器

递归算斐波那契慢如蜗牛?
加个 @lru_cache速度飙升千倍,不用改一行逻辑。

from functools import lru_cache

@lru_cache(maxsize=128)
deffib(n):
return n if n < 2else fib(n-1) + fib(n-2)

print(fib(100))  # 瞬间出结果 ⚡

缓存命中率超 90% 的场景,性能提升不是10倍,是100倍


6. itertools:迭代器的魔法工厂

想生成所有组合、排列、笛卡尔积?
itertools 一行搞定,内存占用几乎为零(惰性求值)。

import itertools

# 所有两两组合
for combo in itertools.combinations(['A''B''C'], 2):
    print(combo)  # ('A','B'), ('A','C'), ('B','C')

# 无限循环
counter = itertools.count(start=10, step=3)
print(next(counter), next(counter))  # 10, 13

处理大数据流?它比 pandas 更轻、更快


7. concurrent.futures:并发入门,简单到哭

多线程/多进程太难?
ThreadPoolExecutor 三行实现并发,连 GIL 都能绕着走。

from concurrent.futures import ThreadPoolExecutor
import time

deffetch(url):
    time.sleep(1)  # 模拟网络请求
returnf"Done: {url}"

urls = ["a.com""b.com""c.com"]
with ThreadPoolExecutor() as executor:
    results = list(executor.map(fetch, urls))
# 3 秒变 1 秒,就问你香不香?💨

CPU 密集用 ProcessPoolExecutor,IO 密集用 ThreadPoolExecutor——这是老手的默认配置。


最后说句实在话

这些模块不是“新”,而是被严重低估
官方文档里躺着,GitHub 上没人提,但真正干活的人,早就用烂了

下次写脚本前,先想想:
是不是又在用蛮力,而忘了 Python 早给你备好了火箭?🚀

代码跑得快,老板笑得欢——这才是程序员的硬通货。

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  1. CONNECT:[ UseTime:0.000482s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000978s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000402s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000264s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000485s ]
  6. SELECT * FROM `set` [ RunTime:0.000181s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000608s ]
  8. SELECT * FROM `article` WHERE `id` = 476334 LIMIT 1 [ RunTime:0.000532s ]
  9. UPDATE `article` SET `lasttime` = 1772240299 WHERE `id` = 476334 [ RunTime:0.146001s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.007545s ]
  11. SELECT * FROM `article` WHERE `id` < 476334 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002874s ]
  12. SELECT * FROM `article` WHERE `id` > 476334 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001112s ]
  13. SELECT * FROM `article` WHERE `id` < 476334 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.069904s ]
  14. SELECT * FROM `article` WHERE `id` < 476334 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002654s ]
  15. SELECT * FROM `article` WHERE `id` < 476334 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002620s ]
0.321781s