Does this help http://stackoverflow.com/questions/12284227/how-to-configure-pydev-to-debug-external-app-that-runs-embedded-python-scripts
By the way: if you have Visual Studio, you can also use it as Python IDE according to http://www.hanselman.com/blog/OneOfMicrosoftsBestKeptSecretsPythonToolsForVisualStudioPTVS.aspx