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Chapter 4 - Section 4.8 A Sample of Python Libraries - SubSection Matplotlib
In the source code showing how to use Agg backend, you should put in evidence that the chart must be processed between the use of Agg and the saving of the figure.
import matplotlib
matplotlib.use('Agg')
bar_chart(genres, modals, counts)
pylab.savefig('modals.png')
print('Content-Type: text/html')
print()
print('<html><body>')
print('<img src="modals.png"/>')
print('</body></html>')
