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Which of the following is the correct syntax to broadcast a message to all clients using Flask-SocketIO?

easy📝 Syntax Q12 of 15
Flask - WebSocket and Real-Time
Which of the following is the correct syntax to broadcast a message to all clients using Flask-SocketIO?
Asocketio.emit('message', data, broadcast=True)
Bsocketio.send('message', data, broadcast=True)
Csocketio.emit('message', data, to='client')
Dsocketio.broadcast('message', data)
Step-by-Step Solution
Solution:

  1. Step 1: Recall Flask-SocketIO broadcast syntax

    The correct way to broadcast is using socketio.emit with broadcast=True.

  2. Step 2: Check each option

    socketio.emit('message', data, broadcast=True) matches the correct syntax. socketio.send('message', data, broadcast=True) incorrectly passes data as the callback argument to send, causing an error. socketio.emit('message', data, to='client') targets a single client. socketio.broadcast('message', data) is not a valid method.

  3. Final Answer:

    socketio.emit('message', data, broadcast=True) -> Option A

  4. Quick Check:

    Use emit with broadcast=True [OK]
Quick Trick: Use emit with broadcast=True to send to all [OK]
Common Mistakes:
MISTAKES
  • Using send instead of emit for broadcasting
  • Forgetting to add broadcast=True
  • Using invalid method names like broadcast()

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