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Stacked Bar Charts

Stacked Bar Charts using C3PyO

The data plotted first is stacked at the bottom by default. 
    countries = ['USA', 'GB', 'China', 'Russia', 'Germany']
    bronzes = [38, 17, 26, 19, 15]
    silvers = [37, 23, 18, 18, 10]
    golds = [46, 27, 26, 19, 17]

    import c3pyo as c3
    chart = c3.BarChart()
    chart.plot(bronzes, color='#CD853F', label='Bronzes')
    chart.plot(silvers, color='Silver', label='Silvers')
    chart.plot(golds, color='GoldenRod', label='Golds')
    chart.stacked(True)
    chart.set_xticklabels(countries)
    chart.ylabel('Medals at 2016 Olympics')
    chart.show()