You might want to look at
Django Graphos
It supports lot of backends, and integrates well with Django orm, but can work with other data sources too.
Chart types supported
Flot
- Line chart
- Bar Chart
- Point Chart
Google Charts
- Line chart
- Column chart
- Bar chart
- Candlestick charts
- Pie chart
YUI
- Line chart
- Column chart
- Bar chart
- Pie chart
Morris.js
- Line chart
- Column chart
- Donut chart
[Disclosure: I am one of the authors]
