def __new__(cls,
return_tuple=False,
**kwargs):
if return_tuple:
props = set()
for name in cls.properties():
props.add(name)
props |= set(kwargs.keys())
props = list(props)
Model2 = namedtuple('Model2', props)
return Model2(**{name: (kwargs[name] if name in kwargs else None) for name in props})
else:
return Model.__new__(Model, **kwargs)
