emacs lsp, how to set python project root?

Hi, I am rejigging my setup and moving my aging language over to lsp and for my python setup I am wondering how lsp determines the project root. Any tips are greatly appreciated. ​ thx. S

The list of project roots/folders is stored (typically) in the file `~/.emacs.d/lsp-session-v1`. You can add a folder interactively in an emacs session with `M-x lsp-workspace-folders-add`. I think one can add a folder at startup with some elisp in `init.el`, but I cannot find an example of that idiom, sorry. \[edit - grammar\]

thanks, I'll take a look ! 👍