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pythonc++pybind11

ImportError: No module named <module_name> with pybind11 on MacOS

I am trying to import C++ module created using pybind11 to python script. The directory structure is:

pybind_test:

    main.cpp
    build
    CMakeLists.txt
    test.py
    pybind11 (github repo clone)


It builds successfully and the file module_name.cpython-39-darwin.so is created. However when running test.py I get:

File "../test.py", line 2, in <module>
    from build.module_name import *
ImportError: No module named build.module_name

My CMakeLists file: 

cmake_minimum_required(VERSION 3.4...3.18)
set(CMAKE_CXX_STANDARD 17)
project(pybindtest)
add_subdirectory(pybind11)
pybind11_add_module(module_name main.cpp)

How would I import this module into python like a normal python module?

Solution

  • As you noticed, the compiled library must be in a route (in terms of file path) reachable by the Python executable (which you achieved by moving test.py to the build directory, where your compiled library is). You could also move the compiled library to your Python's site-packages folder, where other modules are stored.