问题描述
我想做什么:安装一个暴露 c++ 类的 python/cython 模块,并且以后能够在任何 cimport
文件中.pyx
它。
什么不起作用:一旦安装了模块,我就无法cimport
管理该文件。 cython 编译工作正常,因为我可以在纯 python 中使用包装类。
文件结构:
├── cytest
│ ├── cywrappers
│ │ ├── cynode.pxd
│ │ └── cynode.pyx
│ └── hpp
│ └── node.hpp
└── setup.py
node.hpp:
#ifndef graph_HPP
#define graph_HPP
class Node
{
public:
int ID;
double value;
Node(){;};
Node(int tid,double tvalue)
{this->ID = tid; this->value = tvalue;}
void multiplicate(double num){this->value = this->value * num;}
};
#endif
cynode.pxd
cdef extern from "node.hpp":
cdef cppclass Node:
Node()
Node(int tid,double tvalue)
int ID
double value
void multiplicate(double num)
cynode.pyx
cimport cynode
cdef class pynode:
cdef cynode.Node c_node
def __cinit__(self,int tid,double tval):
self.c_node = cynode.Node(tid,tval)
def print_val(self):
print("ID: ",self.c_node.ID,"value: ",self.c_node.value)
def multiplicate(self,mul):
self.c_node.multiplicate(mul)
和setup.py
:
from setuptools import setup,find_packages,Extension
from Cython.distutils import build_ext
import numpy as np
setup(
name = "pycytest",packages=find_packages(include=['cytest','cytest.*']),package_data={'': ['*.pxd','*.pyx','*.hpp']},zip_safe=False,ext_modules=
[Extension("cytest.cywrappers.cynode",sources = ["cytest/cywrappers/cynode.pyx"],language="c++",extra_compile_args=["-O3","-std=c++11"],include_dirs=["./cytest/hpp/",np.get_include()])],cmdclass = {'build_ext': build_ext}
)
我使用 pip install .
安装并尝试在 jupyter notebook
(来自其他位置)中使用它。
import cytest.cywrappers.cynode as cynode
node = cynode.pynode(5,7.6)
node.print_val()
node.multiplicate(67)
node.print_val()
应有的输出:
('ID: ',5,'value: ',7.6)
('ID: ',509.2)
但是,如果我尝试以下任何一行:
%%cython --cplus
# from cytest cimport cywrappers
# cimport cytest
# cimport cynode
我总是得到一个 'XXX.pxd' not found
。
有人有解决办法吗?我搜索了很长时间,恐怕找不到合适的关键字。
解决方法
我设法让它工作:
- 我重命名了扩展名以适应
pyx
- 我确保
pxd
在相对导入 (hpp
) 中导入了cdef extern from "../hpp/node.hpp":
- 最后,为了让
package_data
能够找到并包含存储库中的所有文件(需要在后面的pyx
中重用代码),我添加了一个空的__init__.py
每个目录。
现在我可以cimport cytest.cywrappers.cynode as cynode
。
我尝试了很多东西,所以所有的编辑都不相关,但这里有一个有效的setup.py
:
from setuptools import setup,find_packages,Extension
from Cython.Distutils import build_ext
from Cython.Build import cythonize
import numpy as np
extension = cythonize( [Extension("cytest.cywrappers.cynode",sources = ["cytest/cywrappers/cynode.pyx"],language="c++",extra_compile_args=["-O3","-std=c++11"],include_dirs=["./cytest/hpp/",np.get_include()])],compiler_directives = {"language_level": 3,"embedsignature": True})
setup(
name = "pycytest",packages=find_packages(include=['cytest','cytest.cywrappers']),package_data={"cytest": ["./*/*.pyx","./*/*.pxd","./*/*.hpp" ]},zip_safe=False,ext_modules=extension,cmdclass = {'build_ext': build_ext}
)