In matplotlib, how do you display an axis on both sides of the figure?

Question

I want to draw a plot with matplotlib with axis on both sides of the plot, similar to this plot (the color is irrelevant to this question):

Answer 1

I've done this previously using the following:

# Create figure and initial axis    
fig, ax0 = plt.subplots()
# Create a duplicate of the original xaxis, giving you an additional axis object
ax1 = ax.twinx()
# Set the limits of the new axis from the original axis limits
ax1.set_ylim(ax0.get_ylim())

This will exactly duplicate the original y-axis.