Delete all spaces and tabs at the end of my lines

In vim:

:%s/\s\+$//

Explanation:

: command
% apply to entire file
s search and replace
/\s\+$/ regex for one or more whitespace characters followed by the end of a line
// replacement value of an empty string

I use this function :

func! DeleteTrailingWS()
  exe "normal mz"
  %s/\s\+$//ge
  exe "normal `z"
endfunc

Leader,w to remove trailing white spaces

noremap <leader>w :call DeleteTrailingWS()<CR>

Remove trailing white spaces when saving a python file:

autocmd BufWrite *.py :call DeleteTrailingWS()

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