Fortunately, I found the solution. Executing of the following strings 
helped me:

matplotlib.use('Qt5Agg')
%matplotlib qt5

see for details 
--> 
https://stackoverflow.com/questions/48244675/use-matplotlib-with-pyqt5-in-jupyter-notebook
вторник, 28 июля 2020 г., 12:29:58 UTC+3 пользователь Anton Ivanov написал:
>
> Hi, everyone!
>
> I have a problem with just starting using of pyqtgraph in jupyter 
> notebook. I try to run the example --> 
> https://pyqtgraph.readthedocs.io/en/latest/introduction.html, but when 
> executing 'pyqtgraph.examples.run()', Kernel deads and restarts 
> automatically. Does anybody know what could be the reason of this problem?
>
> Thanks in advance!
>

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