<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def _decode(self, entries, entry_type):
        '''
        Takes the list of rows returned by sqlite.
        Returns rows in readable format. Transforms tuples into dictionaries,
        and appends information about entry type to the rows.
        '''

        def decode_blobs(row):
            row = list(row)
            for index, value in zip(range(len(row)), row):
                if isinstance(value, types.BufferType):
                    value = str(value)
                    if self._encoding:
                        value = value.decode(self._encoding)
                    row[index] = value
            return row

        decoded = map(decode_blobs, entries)
        if entry_type == 'log':
            mapping = ['hostname', 'message', 'level', 'category',
                       'log_name', 'file_path', 'line_num', 'timestamp']
        elif entry_type == 'journal':
            mapping = ['agent_id', 'instance_id', 'journal_id', 'function_id',
                       'fiber_id', 'fiber_depth', 'args', 'kwargs',
                       'side_effects', 'result', 'timestamp']
        else:
            raise ValueError('Unknown entry_type %r' % (entry_type, ))

        def parse(row, mapping, entry_type):
            resp = dict(zip(mapping, row))
            resp['entry_type'] = entry_type
            return resp

        parsed = [parse(row, mapping, entry_type) for row in decoded]
        return parsed