在Jupyter cdef中运行Cython [英] run Cython in Jupyter cdef

问题描述

我正在寻找合并一些cython来加速我的代码的方法. 我在Jupyter中运行cython代码时遇到问题.

I am looking for incorporate some cython to speed my code. I get a issue with running cython code in Jupyter.

单元格1:

%%cython
cdef fuc():
    cdef int a = 0
    for i in range(10):
        a += i
        print(a)

单元格2:

fuc()

错误:

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-48-10789e9d47b8> in <module>()
----> 1 fuc()

NameError: name 'fuc' is not defined

但是如果我这样做，它就可以正常工作.

but if i do this, it works fine.

%%cython
def fuc():
    cdef int a = 0
    for i in range(10):
        a += i
        print(a)

看起来cdef在Jupyter中使用的方式有所不同，我如何在Jupyter笔记本中使用cdef?

Looks like cdef is using differently in Jupyter, how could I use cdef in Jupyter notebook?

推荐答案

cdef functions can only be called from Cython, not Python. The documentation says

在Cython模块中，Python函数和C函数可以自由调用，但是只能通过解释后的Python代码从模块外部调用Python函数.

Within a Cython module, Python functions and C functions can call each other freely, but only Python functions can be called from outside the module by interpreted Python code.

(已经声明"C函数"由cdef定义，"Python函数"由def定义.)

(having already stated that "C functions" are defined by cdef and "Python functions" by def.)

在Cython中使用def函数.它仍然由Cython编译.您仍然可以在def函数中使用cdef类型.

Use a def function in Cython instead. It's still compiled by Cython. You can still cdef types within your def function.

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