Commited as r385 and will be in the next release.
Patch from Andrey Saitgalin for issue #10
Add C long long support to Python2 Py::Long
I have released 7.0.3 that includes the long long support. Not only the changes you requested but also I added some tests.
udpate realease process
PyCXX V7.0.3 released
Tag version 7.0.3
Update for 7.0.3 release