docs: def add_file(self, filename, overwrite=False):
          """Open given file and add its data by guessing its format. The format
          must be Motorola S-Records, Intel HEX or TI-TXT. Set `overwrite` to
          ``True`` to allow already added data to be overwritten.
  
          """
  
          with open(filename, 'r') as fin:
              self.add(fin.read(), overwrite)