def _reload(self, columns):

        # set the primary key flag on new columns.
        # note any existing PK cols on the table also have their
        # flag still set.
        for col in columns:
            col.primary_key = True

        self.columns.extend(columns)

        self._set_parent_with_dispatch(self.table)
repopulate this :class:`.PrimaryKeyConstraint` given
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/sql/schema.py/PrimaryKeyConstraint._reload