This might be a trivial one, but I kind of stuck here.

I have the following setup:

• entity.cpp/.hpp: containing my Entity class definition and implementation.
• entity_wrap.cpp: my boost python wrapper file which I compile to entity.so
• entity_test.cpp: a test file

What I'd like to do in entity_test.cpp is the following:

Py_SetProgramName(argv[0]);
Py_Initialize();

...
Entity* entity = new Entity;
globals["entity"] = entity;

I now get the following exception:

TypeError: No to_python (by-value) converter found for C++ type: Entity

Which is obvious since I do not load the conversion definition of my types. I now tried to load the entity.so with globals["entity_module"] = import("entity"); but I ran into this exception:

ImportError: No module named entity

I can load the module from a python shell as expected.

My question now is: how do I load the converters defined in entity_wrap.cpp?

Solution

As eudoxos stated, I have to ensure that the module I want to load is in the sys.path:

globals["sys"] = import("sys");
exec("sys.path.append('/path/to/my/module')\n"
     "import entity", globals);

It now works like a charm. Apparently just using Py_SetProgramName(argv[0]); was not enough.