def left_join(self, table, one=None, operator=None, two=None):
        if isinstance(table, JoinClause):
            table.type = 'left'

        return self.join(table, one, operator, two, 'left')
Add a left join to the query
dataset/ETHPy150Open sdispater/orator/orator/query/builder.py/QueryBuilder.left_join