Import QGIS Python modules in Python command line or standalone script

I am running a Windows 7 machine with Python version 2.7.8 (32 bit). I installed QGIS 2.4 (Chugiak) from OSGeo4W and simply want to be able to import the QGIS Python modules (e.g. qgis.core) into the previously installed Python, in much the same way one can do so with arcpy.

I have Googled and set various folders in my PATH and PYTHONPATH environment variables but nothing seems to be able to let me say:

import qgis.core