def display(self,
                ret,
                indent,
                out,
                rows_key=None,
                labels_key=None):

        '''Display table(s).'''

        rows = []
        labels = None

        if isinstance(ret, dict):
            if not rows_key or (rows_key and rows_key in list(ret.keys())):
                # either not looking for a specific key
                # either looking and found in the current root
                for key in sorted(ret):
                    if rows_key and key != rows_key:
                        continue  # if searching specifics, ignore anything else
                    val = ret[key]
                    if not rows_key:
                        out.append(
                            self.ustring(
                                indent,
                                self.DARK_GRAY,  # pylint: disable=no-member
                                key,
                                suffix=':'
                            )
                        )
                        out.append(
                            self.ustring(
                                indent,
                                self.DARK_GRAY,  # pylint: disable=no-member
                                '----------'
                            )
                        )
                    if isinstance(val, (list, tuple)):
                        rows = val
                        if labels_key:
                            # at the same depth
                            labels = ret.get(labels_key)  # if any
                        out.extend(self.display_rows(rows, labels, indent))
                    else:
                        self.display(val, indent + 4, out, rows_key=rows_key, labels_key=labels_key)
            elif rows_key:
                # dig deeper
                for key in sorted(ret):
                    val = ret[key]
                    self.display(val, indent, out, rows_key=rows_key, labels_key=labels_key)  # same indent
        elif isinstance(ret, (list, tuple)):
            if not rows_key:
                rows = ret
                out.extend(self.display_rows(rows, labels, indent))

        return out
Display table(s).