树莓派使用matplotlib出错

** (test_center.py:17547): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files
/home/pi/.local/lib/python3.5/site-packages/matplotlib/backends/backend_gtk3agg.py:16: UserWarning: The Gtk3Agg backend is known to not work on Python 3.x with pycairo. Try installing cairocffi.
  "The Gtk3Agg backend is known to not work on Python 3.x with pycairo. "

(test_center.py:17547): Gtk-ERROR **: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported
追踪与中断点陷阱
 

在代码import matplotlib.pyplot as plt前添加:

import  matplotlib

matplotlib.use("Pdf")

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