docs: def tokenize(
          text,
          lowercase=False,
          deacc=False,
          encoding='utf8',
          errors="strict",
          to_lower=False,
          lower=False):
      """
      Iteratively yield tokens as unicode strings, removing accent marks
      and optionally lowercasing the unidoce string by assigning True
      to one of the parameters, lowercase, to_lower, or lower.
  
      Input text may be either unicode or utf8-encoded byte string.
  
      The tokens on output are maximal contiguous sequences of alphabetic
      characters (no digits!).
  
      >>> list(tokenize('Nic nemůže letět rychlostí vyšší, než 300 tisíc kilometrů za sekundu!', deacc = True))
      [u'Nic', u'nemuze', u'letet', u'rychlosti', u'vyssi', u'nez', u'tisic', u'kilometru', u'za', u'sekundu']
  
      """
      lowercase = lowercase or to_lower or lower
      text = to_unicode(text, encoding, errors=errors)
      if lowercase:
          text = text.lower()
      if deacc:
          text = deaccent(text)
      return simple_tokenize(text)