What does Instance() do in Python assignments?

Question

var = Instance(object)?

Answer 1

It calls the __call__() method.

Answer 2

Actually, I thought it was from the standard library. On inspection, it is from enthought.traits.api.Instance. It holds a reference to an object instance. If you pass a specific class to the constructor (e.g. Instance(MyClass) ), it does validation to make sure you pass the correct class.