If PIP is not recognized as an internal or external command when trying to install Python libraries here are some suggestions to help you.

Read: Java is not recognized as internal or external command How to install npm in cmd? To download NPM in CMD, you need to download the latest version package of Node.js from the official website.

This command will show the installed version of Node.js if the PATH is set correctly. How to Fix the 'npm' is not recognized as an internal or external command Error ...