报错信息如下
#...
from matplotlib.backends import _macosx
RuntimeError: Python is not installed as a framework. The Mac OS X backend will not be able to function correctly if Python is not installed as a framework. See the Python documentation for more information on installing Python as a framework on Mac OS X. Please either reinstall Python as a framework, or try one of the other backends.
解决办法，在终端中
$ cd ~/.matplotlib
$ vim matplotlibrc
编辑文件输入
backend: TkAgg
保存推出，再进去 PyCharm 既可以使用 matplotlib 作图。
