Formation flying basics in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the leader drone's speed to 5 meters per second.

Drone Programming

leader_drone.set_speed([1])

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

A10

B5

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero speed which stops the drone.

Setting speed too high causing instability.

The leader drone's speed is set to 5 m/s to maintain a steady pace for the formation.

2fill in blank

medium

Complete the code to make the follower drone maintain a distance of 3 meters behind the leader.

Drone Programming

follower_drone.set_follow_distance([1])

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

A1

B5

C3

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Setting distance to zero causing collision risk.

Using a distance larger than leader speed.

The follower drone keeps 3 meters behind the leader to maintain safe formation spacing.

3fill in blank

hard

Fix the error in the code to correctly update the formation position of the follower drone.

Drone Programming

follower_drone.update_position(leader_drone.position [1] follower_drone.offset)

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

A-

B*

C/

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Adding offset causing follower to move ahead.

Multiplying or dividing positions causing errors.

The follower drone's position is the leader's position minus the offset to stay behind.

4fill in blank

hard

Fill both blanks to create a dictionary mapping each drone's ID to its current altitude if altitude is above 10 meters.

Drone Programming

altitudes = {drone.id: drone.[1] for drone in drones if drone.[1] [2] 10}

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

Aaltitude

B>

C<

Dspeed

Attempts:

3 left

💡 Hint

Common Mistakes

Using speed instead of altitude.

Using '<' which filters drones below 10 meters.

We use 'altitude' to get the drone's height and filter drones flying above 10 meters using '>'.

5fill in blank

hard

Fill all three blanks to create a dictionary of drone IDs with their speeds if speed is less than 8 m/s.

Drone Programming

slow_drones = {drone.[1]: drone.[2] for drone in drones if drone.[2] [3] 8}

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

Aid

Bspeed

C<

Daltitude

Attempts:

3 left

💡 Hint

Common Mistakes

Using altitude instead of speed.

Using '>' which filters faster drones.

The dictionary maps drone IDs to their speeds, filtering drones moving slower than 8 m/s.

Practice

1. What is the main purpose of formation flying in drone programming?

easy

A. To make drones move together in set positions

B. To make drones fly randomly

C. To make drones land immediately

D. To make drones avoid flying

Solution

1. Step 1: Understand formation flying concept

   Formation flying means drones keep specific positions relative to each other.

2. Step 2: Identify the main goal

   The goal is to move drones together in a planned pattern, not randomly or to stop flying.

3. Final Answer:

   To make drones move together in set positions -> Option A

4. Quick Check:

   Formation flying = moving together [OK]

Hint: Formation flying means drones move together [OK]

Common Mistakes:

• Thinking drones fly randomly
• Confusing formation flying with landing
• Assuming drones avoid flying

2. Which of the following is the correct way to represent a drone's position in a formation list in Python?

easy

A. drone_positions = 0, 0, 1, 1, 2, 2

B. drone_positions = {0, 0, 1, 1, 2, 2}

C. drone_positions = [(0, 0), (1, 1), (2, 2)]

D. drone_positions = '0,0;1,1;2,2'

Solution

1. Step 1: Identify correct data structure for positions

   Positions are pairs of coordinates, best stored as tuples inside a list.

2. Step 2: Check each option

   drone_positions = [(0, 0), (1, 1), (2, 2)] uses a list of tuples, which is correct. Others use sets, strings, or invalid formats.

3. Final Answer:

   drone_positions = [(0, 0), (1, 1), (2, 2)] -> Option C

4. Quick Check:

   Positions as list of tuples = drone_positions = [(0, 0), (1, 1), (2, 2)] [OK]

Hint: Use list of tuples for positions [OK]

Common Mistakes:

• Using sets instead of lists
• Using strings instead of coordinate pairs
• Not grouping coordinates as tuples

3. What will be the output of this code snippet?

positions = [(0,0), (1,1), (2,2)]
for i, pos in enumerate(positions):
    print(f"Drone {i} flies to {pos}")

medium

A. Drone 1 flies to (0, 0)
Drone 2 flies to (1, 1)
Drone 3 flies to (2, 2)

B. Drone 0 flies to (0, 0)
Drone 1 flies to (1, 1)
Drone 2 flies to (2, 2)

C. Drone 0 flies to 0
Drone 1 flies to 1
Drone 2 flies to 2

D. Error: enumerate() not defined

Solution

1. Step 1: Understand enumerate usage

   enumerate gives index and value from the list; here index is drone number, value is position tuple.

2. Step 2: Trace the loop output

   For i=0, pos=(0,0); i=1, pos=(1,1); i=2, pos=(2,2). The print statement formats these correctly.

3. Final Answer:

   Drone 0 flies to (0, 0) Drone 1 flies to (1, 1) Drone 2 flies to (2, 2) -> Option B

4. Quick Check:

   enumerate index + position tuple = Drone 0 flies to (0, 0) Drone 1 flies to (1, 1) Drone 2 flies to (2, 2) [OK]

Hint: enumerate gives index and item together [OK]

Common Mistakes:

• Starting drone count at 1 instead of 0
• Printing only numbers, not tuples
• Assuming enumerate is undefined

4. Identify the error in this code for sending commands to drones:

drones = ['D1', 'D2', 'D3']
positions = [(0,0), (1,1), (2,2)]
for i in range(len(drones)):
    print(f"Send {drones[i]} to position {positions}")

medium

A. print statement missing parentheses

B. drones list is empty

C. range(len(drones)) is invalid syntax

D. positions should be positions[i] to get each drone's position

Solution

1. Step 1: Check loop and indexing

   Loop correctly iterates over drone indices, but positions is printed as whole list, not single position.

2. Step 2: Fix position indexing

   Use positions[i] to get the matching position for each drone.

3. Final Answer:

   positions should be positions[i] to get each drone's position -> Option D

4. Quick Check:

   Match drone with single position = positions should be positions[i] to get each drone's position [OK]

Hint: Index positions with i to match drones [OK]

Common Mistakes:

• Printing whole positions list each time
• Assuming range(len(drones)) is wrong
• Forgetting to index positions

5. You want to program a formation where drones fly in a V shape. Which code snippet correctly assigns positions for 5 drones in this formation?

hard

A. positions = [(-2,2), (-1,1), (0,0), (1,1), (2,2)]

B. positions = [(0,0), (0,1), (0,2), (0,3), (0,4)]

C. positions = [(1,1), (2,2), (3,3), (4,4), (5,5)]

D. positions = [(0,0), (-1,-1), (-2,-2), (-3,-3), (-4,-4)]

Solution

1. Step 1: Understand V shape coordinates

   A V shape has drones spread left and right diagonally from center (0,0).

2. Step 2: Check each option's pattern

   positions = [(-2,2), (-1,1), (0,0), (1,1), (2,2)] has symmetric positions left and right diagonally, forming a V. Others are straight lines or one-sided.

3. Final Answer:

   positions = [(-2,2), (-1,1), (0,0), (1,1), (2,2)] -> Option A

4. Quick Check:

   V shape = symmetric diagonal positions [OK]

Hint: V shape means symmetric diagonal positions [OK]

Common Mistakes:

• Choosing straight line positions
• Not centering the formation
• Using only positive or negative coordinates