code: def read(self,
               filename,
               encoding='utf-8',
               marker_map=None,
               entry_impl=Entry,
               entry_sep='\n\n',
               entry_prefix=None,
               keep_empty=False):
          
          marker_map = marker_map or {}
          for entry in parse(
                  filename,
                  encoding,
                  entry_sep,
                  entry_prefix or entry_sep,
                  keep_empty=keep_empty):
              if entry:
                  self.append(entry_impl([(marker_map.get(k, k), v) for k, v in entry]))
docs: Extend the list by parsing new entries from a file.
  
          :param filename:
          :param encoding:
          :param marker_map: A dict used to map marker names.
          :param entry_impl: Subclass of Entry or None
          :param entry_sep:
          :param entry_prefix: