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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 filter(self, criteria: Q, offset: int = 0, limit: int = 10, order_by: list = ()):
 """Read the repository and return results as per the filer"""


        if criteria.children:
            items = list(self._filter(criteria, self.conn['data'][self.schema_name]).values())
        else:
            items = list(self.conn['data'][self.schema_name].values())

        # Sort the filtered results based on the order_by clause
        for o_key in order_by:
            reverse = False
            if o_key.startswith('-'):
                reverse = True
                o_key = o_key[1:]
            items = sorted(items, key=itemgetter(o_key), reverse=reverse)

        result = ResultSet(
            offset=offset,
            limit=limit,
            total=len(items),
            items=items[offset: offset + limit])
        return result