Function is_id_start

tools/tokenizer/pytokenize.c:208–213

}

static int is_id_start(int cp, int utf8_len)
{
  if (utf8_len == 1 && isalpha(cp) || cp == '_' || utf8_len > 1)
    return 1;
  return 0;
}

static int is_id_follow(int cp, int utf8_len)
{