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

I wa开发者_如何学编程nt 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):

How can I do this with matplotlib?

Note: contrary to what is shown in the example graph, I want the two axis to be exactly the same, and want to show only one graph. Adding the two axis is only to make reading the graph easier.

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You can use tick_params() (this I did in Jupyter notebook):

import matplotlib.pyplot as plt

bar(range(10), range(10))
tick_params(labeltop=True, labelright=True)

Generates this image:

UPD: added a simple example for subplots. You should use tick_params() with axis object.

This code sets to display only top labels for the top subplot and bottom labels for the bottom subplot (with corresponding ticks):

import matplotlib.pyplot as plt

f, axarr = plt.subplots(2)

axarr[0].bar(range(10), range(10))
axarr[0].tick_params(labelbottom=False, labeltop=True, labelleft=False, labelright=False,
                     bottom=False, top=True, left=False, right=False)

axarr[1].bar(range(10), range(10, 0, -1))
axarr[1].tick_params(labelbottom=True, labeltop=False, labelleft=False, labelright=False,
                     bottom=True, top=False, left=False, right=False)

Looks like this:

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There are a couple of relevant examples in the online documentation:

• Two Scales (seems to do exactly what you're asking for)
• Dual Fahrenheit and Celsius

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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.

Eg:

ax = plt.gca()

plt.bar(range(3), range(1, 4))
plt.axhline(1.75, color="gray", ls=":")

twin_ax = ax.twinx()
twin_ax.set_yticks([1.75])
twin_ax.set_ylim(ax.get_ylim())