How to use the asttokens.util.is_non_coding_token function in asttokens

def token_range(self, first_token, last_token, include_extra=False):
    """
    Yields all tokens in order from first_token through and including last_token. If
    include_extra is True, includes non-coding tokens such as tokenize.NL and .COMMENT.
    """
    for i in xrange(first_token.index, last_token.index + 1):
      if include_extra or not is_non_coding_token(self._tokens[i].type):
        yield self._tokens[i]

def next_token(self, tok, include_extra=False):
    """
    Returns the next token after the given one. If include_extra is True, includes non-coding
    tokens from the tokenize module, such as NL and COMMENT.
    """
    i = tok.index + 1
    if not include_extra:
      while is_non_coding_token(self._tokens[i].type):
        i += 1
    return self._tokens[i]

def prev_token(self, tok, include_extra=False):
    """
    Returns the previous token before the given one. If include_extra is True, includes non-coding
    tokens from the tokenize module, such as NL and COMMENT.
    """
    i = tok.index - 1
    if not include_extra:
      while is_non_coding_token(self._tokens[i].type):
        i -= 1
    return self._tokens[i]