code: def read_playlists(self):
          self.playlists = []
          self.selected_playlist = -1
          files = glob.glob(path.join(self.stations_dir, '*.csv'))
          if len(files) == 0:
              return 0, -1
          else:
              for a_file in files:
                  a_file_name = ''.join(path.basename(a_file).split('.')[:-1])
                  a_file_size = self._bytes_to_human(path.getsize(a_file))
                  a_file_time = ctime(path.getmtime(a_file))
                  self.playlists.append([a_file_name, a_file_time, a_file_size, a_file])
          self.playlists.sort()
          
          for i, a_playlist in enumerate(self.playlists):
              if a_playlist[-1] == self.stations_file:
                  self.selected_playlist = i
                  break
          return len(self.playlists), self.selected_playlist
docs: get already loaded playlist id