In [1]: import os
   ...: import sys
   ...: import numpy as np
   ...: import matplotlib.pyplot as plt

In [2]: plt.plot(np.sin(np.linspace(0.,np.pi,100)))
   ...: plt.show()
qt.qpa.xcb: XKeyboard extension not present on the X server
There is no XRandR 1.2 and later version available. There will be only fake screen(s) to use.