manage callbacks in asyncio projects


Signal is a list of registered asynchronous callbacks.

The signal's life-cycle has two stages: after creation its content could be filled by using standard list operations: `sig.append()` etc.

After you call `sig.freeze()` the signal is frozen: adding, removing and dropping callbacks is forbidden.

The only available operation is calling the previously registered callbacks by using `await sig.send(data)`.

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Install python3-aiosignal