import pygal

# Our data is a list of series.
# Each series is a list with a label and a list of data points
data = [
    ["Firefox", [None, None, 0, 16.6, 25, 31, 36.4, 45.5, 46.3, 42.8, 37.1]],
    ["Chrome", [None, None, None, None, None, None, 0, 3.9, 10.8, 23.8, 35.3]],
    ["IE", [85.8, 84.6, 84.7, 74.5, 66, 58.6, 54.7, 44.8, 36.2, 26.6, 20.1]],
    ["Others", [14.2, 15.4, 15.3, 8.9, 9, 10.4, 8.9, 5.8, 6.7, 6.8, 7.5]],
]


# Make a Pygal chart
stackedline_chart = pygal.StackedLine(fill=True)
stackedline_chart.title = "Browser usage evolution (in %)"
stackedline_chart.x_labels = map(str, range(2002, 2013))

# For each series in our data, add label and data points
for label, data_points in data:
    stackedline_chart.add(label, data_points)

# Render the chart
stackedline_chart.render()

# Example modified from the pygal.org documentation