Swig simple example

C++ definitions

#include "myclass.h"

int myclass::get_x()
{
    return x;
}
void myclass::set_x(int v)
{
    x= v;
}

C++ header

class myclass
{
private:
    int x=0;
public:
    int get_x();
    void set_x(int);
};

Compilation

sudo apt install python3-dev swig
swig -o myclass_wrap.cpp -c++ -python  myclass.i 
g++ -c -fPIC  myclass.cpp myclass_wrap.cpp -I /usr/include/python3.6
g++ -shared myclass.o myclass_wrap.o -o _myclass.so

Python code

from myclass import myclass

myobj= myclass()
myobj.set_x(12)
print(myobj.get_x())

Swig Interface file

%module myclass
%{
    #include "myclass.h"
%}

%include "myclass.h"