[Solved] Given this Flask-SocketIO event handler:@socketio.on('exit') def on_exit(data):... | Flask

Flask - WebSocket and Real-Time

Given this Flask-SocketIO event handler:

@socketio.on('exit')
def on_exit(data):
    room = data['room']
    leave_room(room)
    emit('status', f'User exited {room}', room=room)

What is the effect when a client triggers the 'exit' event?

AThe client leaves the specified room and all clients in that room receive the 'status' message.

BThe client leaves the room but no message is sent to other clients.

CThe client remains in the room but receives a confirmation message.

DThe client leaves the room and only the client receives the 'status' message.

Step-by-Step Solution

Solution:

Step 1: Analyze leave_room(room)
This function removes the client from the specified room.
Step 2: Analyze emit call
The emit sends a 'status' event with a message to all clients in the room specified by room=room.
Step 3: Understand message recipients
Since the client has left the room before emitting, the message is sent to all remaining clients in that room, excluding the sender.
Final Answer:
The client leaves the room and all other clients in that room receive the message. -> Option A
Quick Check:
leave_room removes client; emit with room sends to room members. [OK]

Quick Trick: leave_room removes client; emit with room sends to room members [OK]

Common Mistakes:

MISTAKES

Master "WebSocket and Real-Time" in Flask

9 interactive learning modes - each teaches the same concept differently

More Flask Quizzes

Given this Flask-SocketIO event handler: