Pie within a pie

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Source code

Chart Features

This chart is created by adding two pies and some graphics on the same canvas. It may seem a bit fiddly to do all this to lay out a single chart, but if you consider the fact that this single python module can now be used to generate batches of thousands of charts, with different data for each passed in dynamically, you can appreciate that a bit of work up front to get an exact template can save massively.