How to print to Python terminal with Boost::Python - c++

Question

I would like to do the equivalent of a print in python from a library I wrote in C++. I am using Boost 1.60.0 and Python 2.7.
I found the following sites :Mantid and WikiBooks. From what I understood this code should work, but nothing is printed.
cpp file
void greet()
{
std::cout<<"test_01\n";
std::cout<<"test_02"<<std::endl;
printf("test_03");
}
BOOST_PYTHON_MODULE(PythonIntegration)
{
def("greet", greet);
}
py file
import PythonIntegration
PythonIntegration.greet()
I checked if the function was called by making it return something and it works, but still nothing is printed.
Thank you for your help

Answer 1

This hello world example seems to do exactly what you want : https://en.wikibooks.org/wiki/Python_Programming/Extending_with_C%2B%2B
Basically...
C++
#include <iostream>
using namespace std;
void say_hello(const char* name) {
cout << "Hello " << name << "!\n";
}
#include <boost/python/module.hpp>
#include <boost/python/def.hpp>
using namespace boost::python;
BOOST_PYTHON_MODULE(hello)
{
def("say_hello", say_hello);
}
Now, in setup.py
#!/usr/bin/env python
from distutils.core import setup
from distutils.extension import Extension
setup(name="PackageName",
ext_modules=[
Extension("hello", ["hellomodule.cpp"],
libraries = ["boost_python"])
])
Now you can do this :
python setup.py build
Then at the python command prompt :
>>> import hello
>>> hello.say_hello("World")
Hello World!