PyLint marks are produced with marks. ( :h :sign )
you can use
:sign unplace *
to delete all characters in all buffers. This will only be a problem if you want some buffers to retain traits.
If you want to remove characters only in the current buffer, you can use the Ingo Karkat response display.
nnoremap <leader>s :execute 'sign unplace * buffer=' . bufnr('')<CR>
Take a look at :h :sign-unplace for other options.
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