PY_EXPORT

cimport.py

from sys import platform
from ctypes import cdll, CDLL
from ctypes import sizeof, c_void_p

def loadlibrary(name): 
    '''loads library "name[32/64/...][.dll/.so]" depending on platform'''
    return CDLL((name+"{}{}").format(sizeof(c_void_p)*8, "" if platform=="win32" else ".so"))

pyexport.h

#ifndef PY_EXPORT
#   if defined(WIN32) || defined(_WIN32) || defined(WIN64) || defined(_WIN64)
#       define PY_EXPORT extern "C" __declspec(dllexport)
#   else
#       define PY_EXPORT extern "C"
#   endif
#endif