Pie charts

Plot pie charts with labels, explode and autopct.

A pie chart divides a circle into sectors (wedges), each showing a part of the whole, in proportion to its value.

With Pandas: df.plot(kind='pie', y='column'). You must give the column y to plot (or use subplots=True to draw one pie for each column).

The wedge labels are the DataFrame's index values: so make the categories the index.

Customising a pie chart:

legend=False removes the legend box;
explode: a list of numbers that pulls wedges out from the centre, to highlight them;
autopct='%.1f%%': shows each wedge's percentage, to one decimal place;
colors: a list of colours for the wedges.

One column makes one pie.

One column, one pie.

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