I used PyQt to develop a UI layer for one of my app, moneyGuru, and I ended up not using any graphing library at all and simply painted directly with QPainter. It's really not that complicated. All in all, for line graphs and bar graphs, it's about 300 lines. Surely not as much troubles as SIP/C++/cross compilation hell. The source is at
https://bitbucket.org/hsoft/moneyguru
The parts that you'll find interesting are at
https://bitbucket.org/hsoft/moneygur.../graph_view.py
https://bitbucket.org/hsoft/moneygur..._graph_view.py
https://bitbucket.org/hsoft/moneygur..._graph_view.py