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"""
Shoiw how to display two scales on the left and right y axis -- Fahrenheit and Celcius
"""
import matplotlib.pyplot as plt
fig = plt.figure()
ax1 = fig.add_subplot(111) # the Fahrenheit scale
ax2 = ax1.twinx() # the Celcius scale
def Tc(Tf):
return (5./9.)*(Tf-32)
def update_ax2(ax1):
y1, y2 = ax1.get_ylim()
ax2.set_ylim(Tc(y1), Tc(y2))
ax2.figure.canvas.draw()
# automatically update ylim of ax2 when ylim of ax1 changes.
ax1.callbacks.connect("ylim_changed", update_ax2)
ax1.plot([78, 79, 79, 77])
ax1.set_title('Two scales: Fahrenheit and Celcius')
ax1.set_ylabel('Fahrenheit')
ax2.set_ylabel('Celcius')
plt.show()
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