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Cython,帮你把Python代码转成C代码,然后再编译成机器能飞快执行的东西

  • 2026-07-02 12:14:08
Cython,帮你把Python代码转成C代码,然后再编译成机器能飞快执行的东西

说实话,我用了好几年Python,一直有个心结。

写出来的脚本跑个爬虫还行,一到数据处理、算法计算那块,慢得我怀疑人生。有次写了个循环处理十万条数据,泡了杯咖啡回来它还在跑,那感觉,真想把电脑扔出去。

后来跟一个做量化交易的朋友吐槽,他笑了:“你不知道Cython?”

我一脸懵。Python就Python,C就C,Cython是个什么鬼?

它到底是干嘛的?

简单说,Cython这玩意儿就像个翻译官。

你写的Python代码,它帮你转成C代码,然后再编译成机器能飞快执行的东西。官方数据说,PyPI上每个月下载量超过7000万次——你没看错,七千万。

更骚的是,你不用全部重写。觉得哪里慢,就改哪里。比如那个慢得要死的循环,加几个类型声明,速度直接起飞。

举个例子吧,纯Python循环一百万次做累加,可能要0.3秒左右。用Cython加上cdef int i这种声明,能跑到0.01秒以内。30倍提速,这是起步价。

我见过最离谱的用法

有个做图像处理的朋友,原来处理一张图要8秒。他把核心算法用Cython重写了一下——不是全改,就改了个别函数——结果跑到0.2秒。

他给我发消息的时候,我都能想象出他脸上的表情。

这玩意儿特别适合干三件事:

第一,包装现成的C/C++库。你有个写好的C函数?Cython可以直接调,不用折腾ctypes那些破事。

第二,加速数值计算。配合NumPy数组,Cython能直接操作内存里的数据,省掉Python那层封装的开销。

第三,写高性能模块。有些场景Python实在扛不住,Cython让你用接近C的速度写Python代码。

跟其他方案比呢?

有人会问,不是有PyPy、Numba这些吗?

PyPy是JIT编译,运行时优化,但它跟一些CPython扩展不兼容,你辛辛苦苦装的库可能跑不了。Numba呢,只支持数值计算那一小块,你写个字符串处理它就不理你了。

Cython的好处是——生成一次C代码,到处编译。你开发机器上跑通了,丢到服务器上也能跑。兼容性基本没出过岔子。而且它从2000年代初就开始做了,二十年积累,坑基本都被踩平了。

怎么上手?

安装特简单,一行命令的事:

pip install Cython

前提是你电脑上有C编译器。Windows用户可能需要装个Visual Studio Build Tools,Mac用户Xcode命令行工具,Linux用户一般自带gcc。

写个.pyx文件,里面可以混着Python和C语法。然后用一个setup.py告诉Python怎么编译,跑一下就生成可以直接import的模块了。

我刚开始试的时候,就是把一个原本要跑10秒的函数改成了Cython版本,一下降到0.8秒。那种感觉,就像给老爷车换了火箭发动机。

说点实在的

Cython不是银弹。如果你的代码瓶颈在I/O或者网络请求,它帮不了太多。但如果瓶颈是CPU计算——大量循环、递归、数值运算——那它绝对值得一试。

而且门槛真不高。你先用纯Python写,跑通了觉得慢,再把.py改成.pyx,给关键变量加个类型声明,大部分情况就能看到明显提升。

还想再狠一点?可以关掉bounds check,关掉wraparound,甚至直接用C的指针操作内存。当然这有点走火入魔了,普通场景用不上。

我现在写项目,但凡涉及计算密集的部分,第一反应都是“要不要用Cython试试”。这不是装,是真的被它救过太多次了。


项目地址: https://github.com/cython/cython

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  1. CONNECT:[ UseTime:0.000503s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000721s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100700s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.012403s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000657s ]
  6. SELECT * FROM `set` [ RunTime:0.100800s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001761s ]
  8. SELECT * FROM `article` WHERE `id` = 496953 LIMIT 1 [ RunTime:0.101416s ]
  9. UPDATE `article` SET `lasttime` = 1783006071 WHERE `id` = 496953 [ RunTime:0.465094s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.037858s ]
  11. SELECT * FROM `article` WHERE `id` < 496953 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.036701s ]
  12. SELECT * FROM `article` WHERE `id` > 496953 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.023160s ]
  13. SELECT * FROM `article` WHERE `id` < 496953 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.180028s ]
  14. SELECT * FROM `article` WHERE `id` < 496953 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.827172s ]
  15. SELECT * FROM `article` WHERE `id` < 496953 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.414891s ]
2.392795s