This is what tells the command line which folders it needs to look in when searching for the file. If Python isn’t added to PATH, then you would need to point CMD directly to the Python.exe and ...

Note that the Python interpreter must be included in the user's PATH variable to function from the command line. How to set the interpreter in the PATH differs between Windows systems.

The uv utility lets you run Python packages and libraries with one command and no setup. Here's the quick guide to running Python packages without installing them.