[C++-sig] create module in embedded python

[Horváth Imre]

Hi!

I want to create a python module in embedded python from string (The
module script is stored in a database).

My code looks like this:

command.py:

class Command:
        def execute(self):
                return "foo"

main.cpp:

#include <iostream>
#include <fstream>
#include <boost/python.hpp>

int main(int argc, char **argv)
{
    Py_Initialize();
        try
        {
                // read the Command class
                std::stringstream buffer;
                std::ifstream ifile("command.py");
                buffer << ifile.rdbuf();
                ifile.close();
                boost::python::str command_class(buffer.str());

                // create module
                boost::python::object py_module_new = 
boost::python::import("new");
                boost::python::object module =
py_module_new.attr("module")("testmodule");
                boost::python::object module_namespace = 
module.attr("__dict__");
                // add Command class to the module
                boost::python::exec(command_class, module_namespace);
                
                // test Command
                boost::python::object command = module.attr("Command")();
                boost::python::object r = command.attr("execute")();

                std::string value = boost::python::extract<std::string>(r);
                std::cout << value << std::endl;
        }
        catch(...)
        {
                PyErr_Print();
                PyErr_Clear();
        }
    
    Py_Finalize();

        return 0;
}

It works as expected.

But when I add and import command to the command.py file, it fails:

command.py:

import math
class Command:
        def execute(self):
                return "foo"

The error is:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: __import__ not found

What am I missing?

Thanks in advance:
Imre Horvath

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