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Demonstrates how to call a C++ class from Python using pybind11.

License: Mozilla Public License 2.0

CMake 15.18% C++ 65.73% Python 19.09%

class cpp11 example pybind11 python

pybind11-demo's Introduction

pybind11 demo

Demonstrates how to call a C++ class from Python using pybind11.

Tested on Linux and Mac: https://travis-ci.org/bast/pybind11-demo/builds

How to build this demo

git clone --recursive https://github.com/bast/pybind11-demo.git
cd pybind11-demo
mkdir build
cd build
cmake ..
make

Example test run

>>> from example import add
>>> add(2, 3)
5
>>> from example import Pet
>>> my_dog = Pet('Pluto', 5)
>>> my_dog.get_name()
'Pluto'
>>> my_dog.get_hunger()
5
>>> my_dog.go_for_a_walk()
>>> my_dog.get_hunger()
6

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apojomovsky ipashchenko curtkim rusu24edward simonryu renesugar melfork hinoue will-lauer gxm651182644 zhang-yonglin ducbx pinxuezhao gfa99 dreamerzhang11

pybind11-demo's Issues

Building example in conda environment

Hi, thanks for your work. I would like to run the code in conda environment that has different python version (3.7) than my base environment (3.8). I follow the example building and reaching the cmake .. step i get this:

-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.8.so (found version "3.8.2") 
-- Found PythonInterp: /home/msa/anaconda3/envs/pybind11_demo/bin/python3.7 (found version "3.7.9") 
-- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.8.so
-- Performing Test HAS_CPP14_FLAG
-- Performing Test HAS_CPP14_FLAG - Success
-- pybind11 v2.3.dev0
-- Performing Test HAS_FLTO
-- Performing Test HAS_FLTO - Success
-- LTO enabled
-- Configuring done
-- Generating done
-- Build files have been written to: /home/msa/Documents/repos/pybind11-demo/build

So it already looks like PythonLibs and PythonInterp are found for different versions of python. Finishing the build with make i obtain example.cpython-37m-x86_64-linux-gnu.so. Testing it with python -c "import example" gives the following error:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: Python version mismatch: module was compiled for version 3.8, while the interpreter is running version 3.7.

What should i change (perhaps in CMakeLists.txt) to be able to build this for my conda environment? I found a solution that gives a complicated setup.py that nevertheless works, but for my own understanding id like a minimal example. Thanks in advance.

Test skips the Python import

This was done because it seems difficult to get a consistent Python version for the interpreter, libraries, and pybind11. Until then testing only the compilation.

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