It appears that from my Googling that the latest Matplotlib (I think v3.10) removed the "collections" attribute from the QuadContourSet class. See the link below: ...
line_chart.title = 'Browser usage evolution (in %)' line_chart.x_labels = map(str, range(2002, 2013)) line_chart.add('Firefox', [None, None, 0, 16.6, 25, 31, 36.4, 45 ...
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