docs: def ucn_to_unicode(ucn):
      """
      Convert a Unicode Universal Character Number (e.g. "U+4E00" or "4E00") to
      Python unicode (u'\\u4e00')
      """
      if isinstance(ucn, string_types):
          ucn = ucn.strip("U+")
          if len(ucn) > int(4):
              char = b'\U' + format(int(ucn, 16), '08x').encode('latin1')
              char = char.decode('unicode_escape')
          else:
              char = unichr(int(ucn, 16))
      else:
          char = unichr(ucn)
  
      assert isinstance(char, text_type)
  
      return char