def dlf_notation(atom_key):
split = list(atom_key)<EOL>element = '<STR_LIT>'<EOL>number = False<EOL>count = <NUM_LIT:0><EOL>while number is False:<EOL><INDENT>element = "<STR_LIT>".join((element, split[count]))<EOL>count += <NUM_LIT:1><EOL>if is_number(split[count]) is True:<EOL><INDENT>number = True<EOL><DEDENT><DEDENT>element = "<STR_LIT>".join(i for i in element if not is_number(i))<EOL>element = "<STR_LIT>".join(i for i in element if i != '<STR_LIT:?>')<EOL>return element<EOL>
Return element for atom key using DL_F notation.