df = pd.DataFrame({'mass': [0.330, 4.87 , 5.97],  # doctest: +SKIP
                   'radius': [2439.7, 6051.8, 6378.1]},
                  index=['Mercury', 'Venus', 'Earth'])
plot = df.plot.pie(y='mass', figsize=(5, 5))  # doctest: +SKIP