refactoring_using_match.py

#
# Original
#
dl_lists: list[Any] = html.css("main dl")
    
if len(dl_lists) > 0 and isinstance(dl_lists[0], Selector):
    first_dl_list = dl_lists[0]
else:
    raise ParseException("Expected a <dl>")


#
# Refactored
#
match html.css("main dl"):
    case [first, *_] if isinstance(first, Selector):
        first_dl_list = first
    case _:
        raise ParseException("Expected a <dl>")