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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def left_join_where(self, table, one, operator, two):
 """ Add a "left join where" clause to the query :param table: The table to join with, can also be a JoinClause instance :type table: str or JoinClause :param one: The first column of the join condition :type one: str :param operator: The operator of the join condition :type operator: str :param two: The second column of the join condition :type two: str :return: The current QueryBuilder instance :rtype: QueryBuilder """

        return self.join_where(table, one, operator, two, "left")