def values(self, *columns):
    'Return an iterator yielding result tuples corresponding\n        to the given list of columns'
    if (not columns):
        return iter(())
    q = self._clone()
    q._set_entities(columns, entity_wrapper=_ColumnEntity)
    if (not q._yield_per):
        q._yield_per = 10
    return iter(q)
Return an iterator yielding result tuples corresponding
to the given list of columns
def values(self, *columns):
    'Return an iterator yielding result tuples corresponding\n        to the given list of columns'
    if (not columns):
        return iter(())
    q = self._clone()
    q._set_entities(columns, entity_wrapper=_ColumnEntity)
    if (not q._yield_per):
        q._yield_per = 10
    return iter(q)