/playing_with_pybind11.ipynb

playing_with_pybind11.ipynb

{
  "cells": [
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "%%writefile somecode.cpp\n/*\n<%\nsetup_pybind11(cfg)\n%>\n*/\n#include <pybind11/pybind11.h>\n\nnamespace py = pybind11;\n\nint square(int x) {\n    return x * x;\n}\n\n\nPYBIND11_MODULE(somecode, m) {\n    m.def(\"square\", &square);\n}",
      "execution_count": 1,
      "outputs": [
        {
          "name": "stdout",
          "output_type": "stream",
          "text": "Overwriting somecode.cpp\n"
        }
      ]
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "import cppimport\nsomecode = cppimport.imp(\"somecode\")\nsomecode.square(9)",
      "execution_count": 2,
      "outputs": [
        {
          "data": {
            "text/plain": "81"
          },
          "execution_count": 2,
          "metadata": {},
          "output_type": "execute_result"
        }
      ]
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "%%writefile testarray.cpp\n/*\n<%\nsetup_pybind11(cfg)\n%>\n*/\n#include <pybind11/pybind11.h>\n#include <pybind11/numpy.h>\n\nnamespace py = pybind11;\n\ndouble sumit(py::array_t<double, py::array::c_style> arr)\n{\n    auto a = arr.unchecked<1>();\n    auto ptr = &a(0);\n    double s = 0.0;\n    for(int i=0; i<a.shape(0); i++)\n    {\n        s += ptr[i];\n    }\n    return s;\n}\n\nPYBIND11_MODULE(testarray, m) {\n    m.def(\"sumit\", &sumit);\n}",
      "execution_count": 3,
      "outputs": [
        {
          "name": "stdout",
          "output_type": "stream",
          "text": "Overwriting testarray.cpp\n"
        }
      ]
    },
    {
      "metadata": {
        "trusted": true
      },
      "cell_type": "code",
      "source": "import numpy, cppimport\ntestarray = cppimport.imp(\"testarray\")\nx = numpy.random.rand(10)\nprint(testarray.sumit(x))\nprint(x.sum())",
      "execution_count": 4,
      "outputs": [
        {
          "name": "stdout",
          "output_type": "stream",
          "text": "5.5030202270703015\n5.5030202270703015\n"
        }
      ]
    }
  ],
  "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": "/playing_with_pybind11.ipynb",
        "public": true
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  "nbformat": 4,
  "nbformat_minor": 4
}