brew install flake8
With syntastic, define the linter:
let g:syntastic_check_on_open = 1
let g:syntastic_always_populate_loc_list = 1
let g:syntastic_auto_loc_list = 1
let g:syntastic_check_on_wq = 0
let g:syntastic_aggregate_errors = 1
pip install black
# pip install black before install black.vim plugin
Install https://github.com/psf/black/blob/main/plugin/black.vim