Runs the ``\\dt`` command and returns a list of column values with
        information about all tables in the database.

def list_tables(self):
        """
        Runs the ``\\dt`` command and returns a list of column values with
        information about all tables in the database.
        """
        lines = output_lines(self.exec_psql('\\dt'))
        return [line.split('|') for line in lines]