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T8b949e# Of course, "very flexible Python" allows you to do without an abstract

T8b949e# superclass at all or use the clever exception `NotImplementedError`. In my

T8b949e# opinion, this can negatively affect the architecture of the application.

T8b949e# I would like to point out that using Kivy, one could use the on-signaling

T8b949e# model. In this case, when the state changes, the model will send a signal

T8b949e# that can be received by all attached observers. This approach seems less

T8b949e# universal - you may want to use a different library in the future.

Te6edf3class Te6edf3ObserverTff7b72:

Ta5d6ff"Tffea00""Ta5d6ffAbstract superclass for all observers.Tffea00""Ta5d6ff"

Te6edf3def Te6edf3model_is_changedTb4b4b4(Te6edf3selfTb4b4b4)Tff7b72:

Ta5d6ff"Tffea00""

Ta5d6ff The method that will be called on the observer when the model changes.

Tffea00""Ta5d6ff"