How to use the sqlparse.tokens.Comment function in sqlparse

idx = 0
    token = tlist.token_next_by_type(idx, T.Comment)
    while token:
        tidx = tlist.token_index(token)
        end = tlist.token_not_matching(tidx + 1,
                                       [lambda t: t.ttype in T.Comment,
                                        lambda t: t.is_whitespace()])
        if end is None:
            idx = tidx + 1
        else:
            eidx = tlist.token_index(end)
            grp_tokens = tlist.tokens_between(token,
                                              tlist.token_prev(eidx, False))
            group = tlist.group_tokens(sql.Comment, grp_tokens)
            idx = tlist.token_index(group)
        token = tlist.token_next_by_type(idx, T.Comment)

                   lambda t: t.ttype == T.Comment.Multiline,
                   ]

# Get path of file to include
                    path = join(self.dirpath, value[1:-1])

                    try:
                        f = open(path)
                        raw_sql = f.read()
                        f.close()

                    # There was a problem loading the include file
                    except IOError, err:
                        # Raise the exception to the interpreter
                        if self.raiseexceptions:
                            raise

                        # Put the exception as a comment on the SQL code
                        yield Comment, u'-- IOError: %s\n' % err

                    else:
                        # Create new FilterStack to parse readed file
                        # and add all its tokens to the main stack recursively
                        try:
                            filtr = IncludeStatement(self.dirpath,
                                                     self.maxRecursive - 1,
                                                     self.raiseexceptions)

                        # Max recursion limit reached
                        except ValueError, err:
                            # Raise the exception to the interpreter
                            if self.raiseexceptions:
                                raise

                            # Put the exception as a comment on the SQL code

def process(self, stack, stream):
        "Process the stream"
        consume_ws = False
        splitlevel = 0
        stmt = None
        stmt_tokens = []

        # Run over all stream tokens
        for ttype, value in stream:
            # Yield token if we finished a statement and there's no whitespaces
            if consume_ws and ttype not in (T.Whitespace, T.Comment.Single):
                stmt.tokens = stmt_tokens
                yield stmt

                # Reset filter and prepare to process next statement
                self._reset()
                consume_ws = False
                splitlevel = 0
                stmt = None

            # Create a new statement if we are not currently in one of them
            if stmt is None:
                stmt = Statement()
                stmt_tokens = []

            # Change current split level (increase, decrease or remain equal)
            splitlevel += self._change_splitlevel(ttype, value)

def group_comments(tlist):
    [group_comments(sgroup) for sgroup in tlist.get_sublists()
     if not isinstance(sgroup, sql.Comment)]
    idx = 0
    token = tlist.token_next_by_type(idx, T.Comment)
    while token:
        tidx = tlist.token_index(token)
        end = tlist.token_not_matching(tidx + 1,
                                       [lambda t: t.ttype in T.Comment,
                                        lambda t: t.is_whitespace()])
        if end is None:
            idx = tidx + 1
        else:
            eidx = tlist.token_index(end)
            grp_tokens = tlist.tokens_between(token,
                                              tlist.token_prev(eidx, False))
            group = tlist.group_tokens(sql.Comment, grp_tokens)
            idx = tlist.token_index(group)
        token = tlist.token_next_by_type(idx, T.Comment)

def __custom_process_line_comment(self, comment):
        tcm = comment.token_next_by_type(0, T.Comment)
        text = tcm.value[2:]
        text = text.strip()
        tcm.value = "-- " + text + "\n"

def is_multiline(self):
        return self.tokens and self.tokens[0].ttype == T.Comment.Multiline

def process(self, stream):
        """Process the stream"""
        EOS_TTYPE = T.Whitespace, T.Comment.Single

        # Run over all stream tokens
        for ttype, value in stream:
            # Yield token if we finished a statement and there's no whitespaces
            # It will count newline token as a non whitespace. In this context
            # whitespace ignores newlines.
            # why don't multi line comments also count?
            if self.consume_ws and ttype not in EOS_TTYPE:
                yield sql.Statement(self.tokens)

                # Reset filter and prepare to process next statement
                self._reset()

            # Change current split level (increase, decrease or remain equal)
            self.level += self._change_splitlevel(ttype, value)

                                       [lambda t: t.ttype in T.Comment,
                                        lambda t: t.is_whitespace()])

def process(self, stream):
        """Process the stream"""
        EOS_TTYPE = T.Whitespace, T.Comment.Single

        # Run over all stream tokens
        for ttype, value in stream:
            # Yield token if we finished a statement and there's no whitespaces
            # It will count newline token as a non whitespace. In this context
            # whitespace ignores newlines.
            # why don't multi line comments also count?
            if self.consume_ws and ttype not in EOS_TTYPE:
                yield sql.Statement(self.tokens)

                # Reset filter and prepare to process next statement
                self._reset()

            # Change current split level (increase, decrease or remain equal)
            self.level += self._change_splitlevel(ttype, value)