通过模块将C++类暴露给Cython

Question

< > >强> >我想做什么：< /强>安装Python／Cython模块，在一个任意的^ {< CD2>}文件中，公开一个C++类，并能够^ ^ {CD1>}。

什么不起作用：安装模块后，我无法管理cimport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中（从另一个位置）使用它

import cytest.cywrappers.cynode as cynode
node = cynode.pynode(5, 7.6)
node.print_val()
node.multiplicate(67)
node.print_val()

应提供的产出：

('ID: ', 5, 'value: ', 7.6)
('ID: ', 5, 'value: ', 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

有人有办法吗？我搜索了相当长的一段时间，恐怕我没有找到正确的关键字

Answer 1

我设法让它工作起来：

• 我重命名了扩展名以适应pyx
• 我确保pxd在相对导入（cdef extern from "../hpp/node.hpp":）中导入了hpp
• 最后，为了使package_data查找并包含存储库中的所有文件（需要在以后的pyx中重用代码），我在每个目录中添加了一个空的__init__.py

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，但这里有一个工作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}

)