Gazebo integration for 3D simulation in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the Gazebo client in your drone simulation.

Drone Programming

import gazebo_client

gazebo_client.[1]()

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Astart

Blaunch

Cinit

Dconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' instead of 'init' which is not defined.

Using 'connect' which is for network connections, not initialization.

The init() function starts the Gazebo client for simulation.

2fill in blank

medium

Complete the code to spawn a drone model in Gazebo at a specific position.

Drone Programming

from gazebo_client import spawn_model

spawn_model('drone', position=[1])

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A{'x':0, 'y':0, 'z':0}

B[0, 0, 0]

C0, 0, 0

D(0, 0, 0)

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list instead of a tuple which may cause errors.

Passing separate values without grouping them.

The position argument expects a tuple representing (x, y, z) coordinates.

3fill in blank

hard

Fix the error in the code to correctly subscribe to Gazebo's drone pose topic.

Drone Programming

def pose_callback(msg):
    print(msg.position)

subscriber = gazebo_client.[1]('drone/pose', pose_callback)

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Asubscribe

Bconnect

Clisten

Dpublish

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'publish' which is for sending messages, not receiving.

Using 'connect' which is not a valid method here.

To receive messages from a topic, you must subscribe to it using subscribe.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps drone names to their altitude if altitude is above 10.

Drone Programming

altitudes = {drone: [1] for drone, data in drones.items() if data['altitude'] [2] 10}

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Adata['altitude']

B>

C<

Ddrone

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' which reverses the condition.

Using drone name as value instead of altitude.

The comprehension extracts altitude values for drones with altitude greater than 10.

5fill in blank

hard

Fill all three blanks to filter and map drone speeds above 5 into a new dictionary with uppercase drone names.

Drone Programming

fast_drones = [1]: [2] for [3], info in drone_data.items() if info['speed'] > 5}

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Adrone.upper()

Binfo['speed']

Cdrone

Dinfo

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'info' as key instead of drone name.

Using 'drone' as value instead of speed.

The keys are uppercase drone names, values are their speeds, iterating over drone names and info.