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Yes, that is how it is implemented today. In the future we might change the tracking callback to happen in a separate thread, so I wouldn't necessarily rely on this behavior. Do you have a specific use case you are trying to solve with this?

Yes specifically I want to call a python function that tells me directly if user is within the exposed users and also within with variant

Instead of the

isOn

method, there is an

evalFeature

method you can use that returns both the value (true or false) plus info about the experiment and variation. https://docs.growthbook.io/lib/python#using-features

aha that's super helpful Jeremy ! exactly what i need , thanks a lot