[Python] How to share x axes of two subplots after they have been created

I'm trying to share two subplots axes, but I need to share the x axis after the figure was created. E.g. I create this figure:

import numpy as np
import matplotlib.pyplot as plt

t = np.arange(1000)/100.
x = np.sin(2*np.pi*10*t)
y = np.cos(2*np.pi*10*t)

fig = plt.figure()
ax1 = plt.subplot(211)
plt.plot(t,x)
ax2 = plt.subplot(212)
plt.plot(t,y)

# some code to share both x axes

plt.show()


Instead of the comment I want to insert some code to share both x axes. How do I do this? There are some relevant sounding attributes _shared_x_axes and _shared_x_axes when I check to figure axis (fig.get_axes()) but I don't know how to link them.

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