How to use the f90nml.tokenizer.Tokenizer.punctuation function in f90nml

word = ''
            if self.char in self.whitespace:
                while self.char in self.whitespace:
                    word += self.char
                    self.update_chars()

            elif self.char in self.comment_tokens or self.group_token is None:
                # Abort the iteration and build the comment token
                word = line[self.idx:-1]
                self.char = '\n'

            elif self.char in '"\'' or self.prior_delim:
                word = self.parse_string()

            elif self.char in Tokenizer.punctuation:
                word = self.char
                self.update_chars()

            else:
                while (not self.char.isspace()
                       and self.char not in Tokenizer.punctuation):
                    word += self.char
                    self.update_chars()

            tokens.append(word)

        return tokens