Don’t panic in case of data tilt, teach you to easily obtain the slope of table tilt>>> 
solve the importerror: Matplotlib is required for plotting problem encountered in jupyter notebook
Reference article:
(1) To solve the importerror: Matplotlib is required for plotting problem in Jupiter notebook
（2） https://www.cnblogs.com/star-zhao/p/9726212.html
Let’s make a note.
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