I have a model which I have lots of instances of.

I've recently added a property to this model.

So now I'm holding an instance of this model, and I want to know if
this is one of the new ones with the new property, or one of the
legacy ones.

If I just write:

if inst.newProp:

that will throw an exception.

Is there a clean way to say "if this property exists in this instance"
without resorting to try/except?

-Joshua

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