Python Jupyter notebook使用pandas绘图，缺少字体

在Jupyter notebook中用pandas绘图，出现以下错误

C:\Users\peiran.peng\AppData\Local\Continuum\anaconda3\lib\site-packages\matplotlib\backends\backend_agg.py:211: RuntimeWarning: Glyph 19996 missing from current font.
  font.set_text(s, 0.0, flags=flags)
C:\Users\peiran.peng\AppData\Local\Continuum\anaconda3\lib\site-packages\matplotlib\backends\backend_agg.py:211: RuntimeWarning: Glyph 22478 missing from current font.
  font.set_text(s, 0.0, flags=flags)
C:\Users\peiran.peng\AppData\Local\Continuum\anaconda3\lib\site-packages\matplotlib\backends\backend_agg.py:211: RuntimeWarning: Glyph 21306 missing from current font.
  font.set_text(s, 0.0, flags=flags)

网上找了一些帖子，都是用以语句设置。但在Jupyter notebook中使用无效。

import matplotlib.pyplot as plt
plt.rcParams['font.sans-serif']=['SimHei']

我又下载了SimHei字体，放在..matplotlib\mpl-data\fonts\ttf路径下安装了，同时如下放开matplotlibrc中font-family及font.sans-serif 前面的#，但还是没有用。

font.family         : sans-serif
...
font.sans-serif     : SimHei, DejaVu Sans, Bitstream Vera Sans, Computer Modern Sans Serif, Lucida Grande, Verdana, Geneva, Lucid, Arial, Helvetica, Avant Garde, sans-serif

请问怎么才能处理呢？

谢谢了！

pl.rcParams['font.sans-serif']=['SimHei'] #显示中文标签
pl.rcParams['font.serif'] = ['KaiTi']
pl.rcParams['axes.unicode_minus'] = False