I am using CentOS 7 and Anaconda 2. Recently, I updated the matplotlib package using conda, if I type
import matplotlib.pyplot as plt, the python interpreter will complain about

This application failed to start because it could not find or load the Qt platform plugin "xcb".
Reinstalling the application may fix this problem

I tried to remove pyqt and then reinstall the package, but that does not help. Finally I have to remove the
entire Anaconda install and reinstall Anaconda.

Is there a better way to solve this problem?