code: def find(self, path, all=False):
          
          matches = []
          for prefix, root in self.locations:
              if root not in searched_locations:
                  searched_locations.append(root)
              matched_path = self.find_location(root, path, prefix)
              if matched_path:
                  if not all:
                      return matched_path
                  matches.append(matched_path)
          return matches
docs: Looks for files in the extra locations
          as defined in ``MEDIA_FIXTURES_FILES_DIRS``.