WebSocket for live updates in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the WebSocket client library.

Raspberry Pi

import [1]

Drag options to blanks, or click blank then click option'

Arequests

Bsocket

Chttp

Dwebsocket

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'socket' instead of 'websocket' will not provide WebSocket client features.

Using 'requests' is for HTTP, not WebSocket.

We use the websocket library to create WebSocket clients in Python on Raspberry Pi.

2fill in blank

medium

Complete the code to create a WebSocket connection to the server URL.

Raspberry Pi

ws = websocket.WebSocket()
ws.[1]("ws://example.com/live")

Drag options to blanks, or click blank then click option'

Acreate

Bconnect

Copen

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'open' or 'start' will cause an AttributeError.

Using 'create' is not a valid method for WebSocket client.

The connect method establishes a WebSocket connection to the given URL.

3fill in blank

hard

Fix the error in the code to receive a message from the WebSocket.

Raspberry Pi

message = ws.[1]()

Drag options to blanks, or click blank then click option'

Arecv

Bsend

Creceive

Dread

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'send' tries to send data instead of receiving.

Using 'receive' or 'read' are not valid methods in this library.

The recv() method receives a message from the WebSocket server.

4fill in blank

hard

Fill both blanks to send a JSON message with a type and data.

Raspberry Pi

import json

msg = json.dumps({"type": [1], "data": [2])
ws.send(msg)

Drag options to blanks, or click blank then click option'

A"update"

B"live"

C"sensor"

D"value"

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'live' as type is incorrect here.

Using 'sensor' as data key is not expected.

The message type is 'update' and the data key is 'value' to send live sensor data.

5fill in blank

hard

Fill both blanks to create a dictionary comprehension filtering live data with values above 50.

Raspberry Pi

live_data = {k: v for k, v in data.items() if v {BLANK_1}} {{BLANK_2}}
filtered = {k: v for k, v in live_data.items()}

Drag options to blanks, or click blank then click option'

A>

B50

C:

D=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' instead of ':' in dictionary comprehension causes syntax error.

Using '<' instead of '>' changes the filter logic.

The comprehension filters values greater than 50 and creates a dictionary with key-value pairs separated by a colon.