code: def find_types(self, site=None, match=r'^(?!lastfile|spectro|\.).*'):
          
          self._find_paths()
          types = [tag for (site_, tag) in self.paths if site in (None, site_)]
          if match is not None:
              match = re.compile(match)
              return list(filter(match.search, types))
          return types
docs: Return the list of known data types.
  
          This is just the basename of each FFL file found in the
          FFL directory (minus the ``.ffl`` extension)