BJTerry

(flycheck-define-checker python-prospector
  "A Python syntax and style checker using Prospector.
See URL `http://prospector.readthedocs.org/en/latest/index.html'."
  :command ("prospector" "-s" "medium" "-M" "-o" "emacs"
            source)
  :error-patterns
  ((error line-start
          (file-name) ":" (one-or-more digit) " :" (optional "\r") "\n"
          (one-or-more " ") "L" line ":" column
          (message (minimal-match (one-or-more not-newline)) "E" (one-or-more digit) (optional "\r") "\n"