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Py-notify is a Python package providing tools for implementing `Observer
programming pattern`. These tools include signals, conditions and variables.
Signals are lists of handlers that are called when signal is emitted. Conditions
are basically boolean variables coupled with a signal that is emitted when
condition state changes. They can be combined using standard logical operators
(*not*, *and*, etc.) into compound conditions. Variables, unlike conditions, can
hold any Python object, not just booleans, but they cannot be combined.
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