wrapping_with_cython.ipynb

wrapping_with_cython.ipynb

{
  "cells": [
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "import os\nif not os.path.exists('testcython'):\n    os.mkdir('testcython')",
      "execution_count": 1,
      "outputs": []
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "%%writefile testcython/testcython.h\n\n#ifndef TESTCYTHON_H\n#define TESTCYTHON_H\n\ndouble sumit(double* x, int n);\n\n#endif",
      "execution_count": 2,
      "outputs": []
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "%%writefile testcython/testcython.cpp\n\n#include \"testcython.h\"\n\ndouble sumit(double* x, int n)\n{\n    double s = 0.0;\n    for(int i=0; i<n; i++)\n    {\n        s += x[i];\n    }\n    return s;\n}",
      "execution_count": 3,
      "outputs": []
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "%%writefile testcython/testcython.pyx\n\n# distutils: sources = testcython.cpp\n# distutils: language = c++\n# cython: language_level=3\n\ncimport numpy as np\nnp.import_array()\n\ncdef extern from \"testcython.cpp\":\n    double sumit(double* x, int n)\n    \ndef sumit_func(np.ndarray[double, ndim=1, mode=\"c\"] x not None):\n    return sumit(<double*> np.PyArray_DATA(x), x.shape[0])",
      "execution_count": 4,
      "outputs": []
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "%%writefile testcython/setup.py\n\nfrom distutils.core import setup, Extension\nimport numpy\nfrom Cython.Distutils import build_ext\nfrom Cython.Build import cythonize\n\nsetup(\n    cmdclass={'build_ext': build_ext},\n    ext_modules=[Extension(\"_testcython\",\n                 sources=[\"testcython.pyx\"],\n                 include_dirs=[numpy.get_include()])],\n)",
      "execution_count": 5,
      "outputs": []
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "!! cd testcython && python setup.py build_ext -i",
      "execution_count": 6,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 6,
          "data": {
            "text/plain": "['running build_ext',\n 'cythoning testcython.pyx to testcython.c',\n \"building '_testcython' extension\",\n 'C:\\\\Program Files (x86)\\\\Microsoft Visual Studio\\\\2017\\\\BuildTools\\\\VC\\\\Tools\\\\MSVC\\\\14.14.26428\\\\bin\\\\HostX86\\\\x64\\\\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -IC:\\\\Anaconda3\\\\envs\\\\pybind11\\\\lib\\\\site-packages\\\\numpy\\\\core\\\\include -IC:\\\\Anaconda3\\\\envs\\\\pybind11\\\\include -IC:\\\\Anaconda3\\\\envs\\\\pybind11\\\\include \"-IC:\\\\Program Files (x86)\\\\Microsoft Visual Studio\\\\2017\\\\BuildTools\\\\VC\\\\Tools\\\\MSVC\\\\14.14.26428\\\\include\" \"-IC:\\\\Program Files (x86)\\\\Windows Kits\\\\10\\\\include\\\\10.0.17134.0\\\\ucrt\" \"-IC:\\\\Program Files (x86)\\\\Windows Kits\\\\10\\\\include\\\\10.0.17134.0\\\\shared\" \"-IC:\\\\Program Files (x86)\\\\Windows Kits\\\\10\\\\include\\\\10.0.17134.0\\\\um\" \"-IC:\\\\Program Files (x86)\\\\Windows Kits\\\\10\\\\include\\\\10.0.17134.0\\\\winrt\" \"-IC:\\\\Program Files (x86)\\\\Windows Kits\\\\10\\\\include\\\\10.0.17134.0\\\\cppwinrt\" /Tctestcython.c /Fobuild\\\\temp.win-amd64-3.8\\\\Release\\\\testcython.obj',\n 'testcython.c',\n 'c:\\\\anaconda3\\\\envs\\\\pybind11\\\\lib\\\\site-packages\\\\numpy\\\\core\\\\include\\\\numpy\\\\npy_1_7_deprecated_api.h(14) : Warning Msg: Using deprecated NumPy API, disable it with #define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION',\n \"testcython.c(1726): warning C4244: 'function': conversion from 'npy_intp' to 'int', possible loss of data\",\n 'C:\\\\Program Files (x86)\\\\Microsoft Visual Studio\\\\2017\\\\BuildTools\\\\VC\\\\Tools\\\\MSVC\\\\14.14.26428\\\\bin\\\\HostX86\\\\x64\\\\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:C:\\\\Anaconda3\\\\envs\\\\pybind11\\\\libs /LIBPATH:C:\\\\Anaconda3\\\\envs\\\\pybind11\\\\PCbuild\\\\amd64 \"/LIBPATH:C:\\\\Program Files (x86)\\\\Microsoft Visual Studio\\\\2017\\\\BuildTools\\\\VC\\\\Tools\\\\MSVC\\\\14.14.26428\\\\lib\\\\x64\" \"/LIBPATH:C:\\\\Program Files (x86)\\\\Windows Kits\\\\10\\\\lib\\\\10.0.17134.0\\\\ucrt\\\\x64\" \"/LIBPATH:C:\\\\Program Files (x86)\\\\Windows Kits\\\\10\\\\lib\\\\10.0.17134.0\\\\um\\\\x64\" /EXPORT:PyInit__testcython build\\\\temp.win-amd64-3.8\\\\Release\\\\testcython.obj /OUT:E:\\\\Dan\\\\Dropbox\\\\Programming\\\\IPythonNotebooks\\\\trying_pybind11\\\\testcython\\\\_testcython.cp38-win_amd64.pyd /IMPLIB:build\\\\temp.win-amd64-3.8\\\\Release\\\\_testcython.cp38-win_amd64.lib',\n '   Creating library build\\\\temp.win-amd64-3.8\\\\Release\\\\_testcython.cp38-win_amd64.lib and object build\\\\temp.win-amd64-3.8\\\\Release\\\\_testcython.cp38-win_amd64.exp',\n 'Generating code',\n 'Finished generating code']"
          },
          "metadata": {}
        }
      ]
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "import testcython._testcython as T\nimport numpy\nx = numpy.random.rand(10)\nprint(T.sumit_func(x))\nprint(x.sum())",
      "execution_count": 7,
      "outputs": [
        {
          "output_type": "stream",
          "text": "4.319090966340295\n4.319090966340295\n",
          "name": "stdout"
        }
      ]
    }
  ],
  "metadata": {
    "kernelspec": {
      "name": "conda-env-pybind11-py",
      "display_name": "Python [conda env:pybind11]",
      "language": "python"
    },
    "language_info": {
      "name": "python",
      "version": "3.8.1",
      "mimetype": "text/x-python",
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "pygments_lexer": "ipython3",
      "nbconvert_exporter": "python",
      "file_extension": ".py"
    },
    "gist": {
      "id": "",
      "data": {
        "description": "wrapping_with_cython.ipynb",
        "public": true
      }
    }
  },
  "nbformat": 4,
  "nbformat_minor": 4
}