Access std::vector in boost::python

python_test.cpp

#include <iostream>
#include <vector>
#include <memory>
#include <boost/shared_ptr.hpp>
#include <boost/python.hpp>
#include <boost/python/stl_iterator.hpp>
#include <Python.h> 

template<typename T> inline std::vector<T> pyListToStdVector(const boost::python::object& iterable)
{
    return std::vector<T>(boost::python::stl_input_iterator<T>(iterable), boost::python::stl_input_iterator<T>());
}

template <class T> inline boost::python::list stdVectorToPyList(std::vector<T> vector)
{
    typename std::vector<T>::iterator iter;
    boost::python::list list;
    for(iter = vector.begin(); iter != vector.end(); ++iter)
    {
        list.append(*iter);
    }
    return list;
}
                                                                                                          
int main()
{                                                                                                         
    Py_Initialize();

    boost::python::object mainModule = boost::python::import("__main__");                                 
    boost::python::object mainNamespace = mainModule.attr("__dict__");                                    

    std::vector<float> valVec;                                                                            
    valVec.push_back(1);
    valVec.push_back(2);                                                                                  
    valVec.push_back(3);                                                                                  
    boost::python::list valList = Utils::stdVectorToPyList(valVec);                                       
    mainModule.attr("valList") = valList;                                                                 
                                                                         
    std::string codeStr = 
    "print valList \n";

    boost::python::exec(codeStr.c_str(), mainNamespace);

}

Here are some useful links:
https://gist.github.com/marcinwol/b8df949bf8009cf856a3
https://github.com/josephturnerjr/boost-python-tutorial/blob/master/part1/hello_world.cpp