code: def _relevant_checkers(self, path):
          
          _, ext = os.path.splitext(path)
          ext = ext.lstrip('.')
          return checkers.checkers.get(ext, [])
docs: Get set of checkers for the given path.
  
          TODO: currently this is based off the file extension.  We would like to
          honor magic bits as well, so that python binaries, shell scripts, etc
          but we're not guaranteed that `path` currently exists on the filesystem
          -- e.g. when version control for historical revs is used.