aiosignal

Warnings

• breaking Dropped support for Python 3.7 and 3.8.
  Fix: Upgrade your Python environment to version 3.9 or newer.
• gotcha Once a Signal is frozen, adding or removing callbacks is forbidden.
  Fix: Ensure all necessary callbacks are added before calling freeze().
• gotcha Callbacks must be asynchronous functions.
  Fix: Define callbacks using async def.

Install

• pip install aiosignal Install aiosignal

Imports

• Signal

  from aiosignal import Signal

  The correct import is directly from the aiosignal package; importing from submodules is incorrect.

Quickstart

This example demonstrates creating a Signal, registering a callback, freezing the signal, and sending data to the callback.

import asyncio
from aiosignal import Signal

async def callback(data):
    print(f'Received data: {data}')

async def main():
    signal = Signal(owner=None)
    signal.append(callback)
    signal.freeze()
    await signal.send('Hello, World!')

asyncio.run(main())