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17 lines
724 B
Plaintext
17 lines
724 B
Plaintext
# Of course, "very flexible Python" allows you to do without an abstract
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# superclass at all or use the clever exception `NotImplementedError`. In my
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# opinion, this can negatively affect the architecture of the application.
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# I would like to point out that using Kivy, one could use the on-signaling
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# model. In this case, when the state changes, the model will send a signal
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# that can be received by all attached observers. This approach seems less
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# universal - you may want to use a different library in the future.
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class Observer:
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"""Abstract superclass for all observers."""
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def model_is_changed(self):
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"""
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The method that will be called on the observer when the model changes.
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"""
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