import unicodedata
import string


def slug(text, separator="-"):
    text = text.lower().replace(" ", separator).replace("ł", "l")
    nfkd_form = unicodedata.normalize('NFKD', text)
    return "".join([c for c in nfkd_form if not unicodedata.combining(c)
                    and c in string.ascii_lowercase+separator])