python mode not well tested

[ggebbie]

proposed solution: follow lsp-mode from daviwil/emacs-from-scratch

[ggebbie]

lsp-mode enabled by default now. Works well in python projects but not in standalone python files.

other issues:

• Use commands like M-x python-shell-send-region to send code from the python file to the REPL, although there really should be some better shortcuts.
• python commands don't show up in REPL
• Use M-x treemacs-symbols to see a workspace dashboard. You should see a breadcrumb list in the header as well. Linting is on and will detect syntax errors. Doesn't seem to work in standalone py files.
• Code completion and function signatures should work although they might be slow due to pyls. Other language servers could be used instead.
• Debugging also available with dap-mode. I didn't test it. Try adding breakpoints and conditional breakpoints, use a REPL after interrupting code.