Autocompletion for Python in Visual Studio

[snippsat]

Edit:
Sorry i did not first see that you meant Visual studio,not Code.
But anyway VS Code is much a better choice for Python usage.

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Look down in left corner for version used,so this version has to have Matplotlib installed.
Can click version to change if have more Python version installed.

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So if i test version show down in left corner from command line.
Will see that Matplotlib is installed

G:\div_code\my_env
λ python -V
Python 3.8.3

G:\div_code\my_env
λ python
Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:37:02) [MSC v.1924 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from matplotlib import pyplot as plt
>>>
>>> exit()

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VS Code from start