Embedding python witn pybind11 using virtualenv

Question

I want to use a python virtual environment with pybind11. My system uses python2 by default. I have a virtual environment (created using virtualenvwrapper) that uses python3. How should I modify the CMake to use the virtual environment? The path of the virutalenv site-packages is

 ~.virtualenvs/name-of-virtual-env/lib/python3.6/site-packages

I tried

but that did not work for me. I am using ubuntu.

This is what I have.

CmakeLists.txt

cmake_minimum_required(VERSION 3.4)
project(example)

add_subdirectory(pybind11)

add_executable(example src/main.cpp)
target_link_libraries(example PRIVATE pybind11::embed)

main.cpp

#include <pybind11/embed.h> // everything needed for embedding
namespace py = pybind11;
using namespace py::literals;


int main() {
    py::scoped_interpreter guard{}; // start the interpreter and keep it alive

    py::module_ sys = py::module_::import("sys");
    py::print(sys.attr("path"));
    py::print("python version: ", sys.attr("version_info"));

    }

output

python version:  sys.version_info(major=2, minor=7, micro=12, releaselevel='final', serial=0)

Your help is very much appreciated

Keith Prussing · Accepted Answer · 2021-10-11 14:24:48Z

1

The initial problem is that the CMake FindPython script prefers the system Python over a virtual environment by default. You can adjust this by setting the Python_VIRTUALENV to FIRST (starting with CMake 3.15).

set(Python_VIRTUALENV FIRST)

Another point to keep in mind is that the find_package call will select the newest version of Python unless you specify an EXACT version.

answered Oct 11, 2021 at 14:24

Keith Prussing

8739 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Embedding python witn pybind11 using virtualenv

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related