code: def release_filename(self, id_):
          
  
          entry = self.__entries.get(id_)
          if entry is None:
              raise ValueError("Invalid filename id (%d)" % id_)
  
          # Decrease reference count and check if the entry has to be removed...
          if entry.dec_ref_count() == 0:
              del self.__entries[id_]
              del self.__id_lut[entry.filename]
docs: Release a file name.