python3.6,安装了Matplotlib 2.2版本，运行图表时提示以下错误：
ImportError: Importing the multiarray numpy extension module failed.
likely you are trying to import a failed build of numpy.
If you're working with a numpy git repo, try `git clean -xdf` (removes all
files not under version control). Otherwise reinstall numpy.
原因是要安装numpy+mkl版本（cp36）
解决办法，卸载掉mumpy后再重新安装正确的版本（.whl）：http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy