Python 3.6 ModuleNotFoundError: No module named matplotlib

Python 3.6 ModuleNotFoundError: No module named 'matplotlib'
sudo python3 -m pip install matplotlib
sudo python3 -m pip show matplotlib
or
sudo apt install python3-matplotlib

[uiuxshoaib]

My cmd says: sudo is not a recognized as an internal or external command, operable program or batch file.

[cnpffvc]

I get an "invalid syntax error" when I try either of these methods