eq_record_factory.py

def record_factory(cls_name, field_names):
    # ...
    def __hash__(self):
        try:
            return hash(self.id)
        except AttributeError:
            raise TypeError('unhashable type {}'.format(cls_name))
    def __eq__(self, other):
        try:
            return hash(self) == hash(other)
        except AttributeError:
            return id(self) == id(other)
    # ...
    cls_attrs = dict(...
                     __hash__  = __hash__,
                     __eq__    = __eq__)
    return type(cls_name, (object,), cls_attrs)