When testing your Python application, it is useful to be able to start the application from the command-line. By default, cPanel only adds the system Python to your $PATH. If you install additional Python versions manually, you will want to add these to your $PATH.
To have Python be available for your modules on the command-line, or for it to be used directly on the command-line, you need to set the following environment variable:
After this, you should be able to use the Python command for your new installation.
To make this change permanent, you can modify your ~/.bashrc or ~/.bash_profile files for the user you want to have access to Node on the command line. Simply add the above command to one of those files, and on every login, it will be set automatically for you.
For more information on the ~/.bashrc file, see this article: How to set environmental variables in .bashrc