Put this snippet at the top of any Python file that is not the top level ... and not running individual modules which call a module found in another folder. There are also examples of Relative Imports ...

find_package(PythonLibs 3) find_package(Boost COMPONENTS python3 numpy3) PYTHON_ADD_MODULE ... another interesting thing is, if i call wrap_import_array and import_ufunc directly in my own module .c ...