docs: def get_one(seq, default=None, skip_string_iter=True):
      """
      Return one item from seq or None(by default).
      """
      if skip_string_iter and isinstance(seq, (str, unicode, bytes, bytearray)):
          return seq
      if not seq:
          return ''
      try:
          return next(iter(seq))
      except TypeError:
          # not hasattr __iter__/__getitem__
          return default