matplotlib

•  python install

https://www.runoob.com/python3/python3-install.html

https://www.python.org/downloads/

•  pip install

https://blog.csdn.net/qq_17753903/article/details/101519860

•  install matplotlib and numpy

pip install matplotlib

pip install numpy

• example 

https://www.runoob.com/w3cnote/matplotlib-tutorial.html

https://matplotlib.org/stable/contents.html#