spyder莫名其妙的出错：ModuleNotFoundError: No module named 'PyQt5.QtWebEngineWidgets'

ModuleNotFoundError: No module named ‘PyQt5.QtWebEngineWidgets’

from PyQt5.QtWebKitWidgets import QWebPage as QWebEnginePage
ImportError: /home/qi/anaconda3/lib/python3.6/site-packages/PyQt5/../../../libgsttag-1.0.so.0: undefined symbol: gst_make_element_message_details

解决方法：
方法一：

$ export LD_LIBRARY_PATH=
$ spyder

方法二：

LD_LIBRARY_PATH= spyder

or

sudo gedit ~/.bashrc

export LD_LIBRARY_PATH= spyder:$LD_LIBRARY_PATH

source ~/.bashrc

then，spyder，OK。