Given this Flask-SocketIO code snippet, what will be the output when a client connects?

medium📝 component behavior Q4 of 15

Flask - WebSocket and Real-Time

from flask import Flask
from flask_socketio import SocketIO

app = Flask(__name__)
socketio = SocketIO(app)

@socketio.on('connect')
def handle_connect():
    print('Client connected')

AThe server prints 'Client connected' when a client connects

BThe server raises an error because 'connect' event is invalid

CNothing happens because the event handler is missing a return

DThe server crashes due to missing app.run()

Step-by-Step Solution

Solution:

Step 1: Understand the 'connect' event handler
The '@socketio.on('connect')' decorator listens for client connections and runs the function when a client connects.
Step 2: Check the function behavior
The function prints 'Client connected' to the server console on each client connection.
Final Answer:
The server prints 'Client connected' when a client connects -> Option A
Quick Check:
'connect' event triggers print = B [OK]

Quick Trick: Use '@socketio.on("connect")' to handle client connections [OK]

Common Mistakes:

MISTAKES

Assuming 'connect' event is invalid
Expecting a return value from event handlers
Forgetting to run the socketio server

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More Flask Quizzes

Given this Flask-SocketIO code snippet, what will be the output when a client connects?

Step 1: Understand the 'connect' event handler

Step 2: Check the function behavior

Final Answer:

Quick Check:

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