Matplotlib 3.0 Cookbook

How to do it...

The following are the steps required to plot our twin axes graph:

1. Define the figure and the main axes (ax1, a y axis on the left) as follows:

fig, ax1 = plt.subplots(1,1)

2. Define the twin axes (ax2, a y axis on the right, and ax3, another y axis on the right):

ax2 = ax1.twinx()ax3 = ax1.twinx()

3. Position ax3 so that it does not overlap with ax2, the right axis:

ax3.spines["right"].set_position(("axes", 1.15))

4. Prepare the data and plot a product defects bar graph on the main axis, ax1:

x = [0, 1, 2, 3, 4, 5]y = [19, 12, 6, 4, 3, 2]b = ax1.bar(x, y, label='Number of Defects')

5. Prepare data and plot cumulative defects as a percentage, on a line graph on the right axis, ax2:

y = [41, 67, 80, 89, 96, 100]l, = ax2.plot(x, ...