Pre-flight checklist automation in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the checklist status as all items unchecked.

Drone Programming

checklist = {'battery': False, 'motors': False, 'gps': False, 'camera': False}
status = [1]

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

Achecklist

Bchecklist.copy()

Clist(checklist)

Ddict()

Attempts:

3 left

💡 Hint

Common Mistakes

Using list() converts keys to a list, not a dictionary.

Using dict() creates an empty dictionary, not a copy.

The variable status should reference the checklist dictionary to track each item's check state.

2fill in blank

medium

Complete the code to mark the 'battery' check as done.

Drone Programming

status['battery'] = [1]

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

A'done'

BTrue

C1

Dchecked

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of boolean values.

Using numbers instead of booleans.

The checklist uses boolean values to mark checks. True means the check is done.

3fill in blank

hard

Fix the error in the code that checks if all items are done.

Drone Programming

if all(status[1]):
    print('Ready for takeoff')

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

A[]

B.keys()

C.items()

D.values()

Attempts:

3 left

💡 Hint

Common Mistakes

Using keys() returns the item names, not their status.

Using items() returns pairs, which all() can't evaluate directly.

The all() function needs the values (True/False) to check if all are done.

4fill in blank

hard

Fill both blanks to update the checklist for items starting with 'c'.

Drone Programming

for item in checklist:
    if item[1]'c'):
        status[item] = [2]

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

Astartswith(

Bendswith(

CTrue

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using endswith instead of startswith.

Setting status to False instead of True.

Use startswith('c') to find items beginning with 'c' and mark them as done with True.

5fill in blank

hard

Fill all three blanks to create a dictionary of checked items only.

Drone Programming

checked_items = [1]: [2] for [3] in status.items() if [2] == True

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

A{k

Bv

Ck, v

D}

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the curly braces.

Using wrong variable names.

Not filtering by True values.

This dictionary comprehension collects keys and values where the value is True, using {k: v for k, v in status.items() if v == True}.

Practice

1. What is the main purpose of automating a pre-flight checklist in drone programming?

easy

A. To improve safety and save time before flying

B. To make the drone fly faster

C. To change the drone's color automatically

D. To increase the drone's battery capacity

Solution

1. Step 1: Understand the goal of pre-flight checks

   Pre-flight checks ensure the drone is safe and ready to fly.

2. Step 2: Identify automation benefits

   Automating these checks saves time and reduces human error.

3. Final Answer:

   To improve safety and save time before flying -> Option A

4. Quick Check:

   Automation = Safety + Time saving [OK]

Hint: Think about safety and efficiency before flight [OK]

Common Mistakes:

• Confusing automation with drone speed
• Assuming automation changes hardware features
• Ignoring safety as the main goal

2. Which of the following is the correct way to define a class in drone programming for a pre-flight checklist?

easy

A. PreFlightCheck = {}

B. def PreFlightCheck(): pass

C. class PreFlightCheck: pass

D. function PreFlightCheck() {}

Solution

1. Step 1: Identify class syntax in drone programming (Python style)

   Classes are defined with the keyword 'class' followed by the name and colon.

2. Step 2: Check options for correct class definition

   class PreFlightCheck: pass uses 'class PreFlightCheck: pass' which is valid syntax.

3. Final Answer:

   class PreFlightCheck: pass -> Option C

4. Quick Check:

   Class keyword + name + colon = correct class [OK]

Hint: Classes start with 'class' keyword and colon [OK]

Common Mistakes:

• Using 'def' instead of 'class' for class definition
• Using curly braces instead of colon
• Assigning class to a dictionary

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

class CheckList:
    def __init__(self):
        self.steps = {'battery': True, 'motors': True, 'gps': False}
    def all_passed(self):
        return all(self.steps.values())

check = CheckList()
print(check.all_passed())

medium

A. False

B. None

C. True

D. Error

Solution

1. Step 1: Analyze the steps dictionary values

   The steps are {'battery': True, 'motors': True, 'gps': False} so values are [True, True, False].

2. Step 2: Evaluate all() function on values

   all() returns True only if all values are True; here one is False, so result is False.

3. Final Answer:

   False -> Option A

4. Quick Check:

   all([True, True, False]) = False [OK]

Hint: all() returns False if any value is False [OK]

Common Mistakes:

• Assuming all() returns True if some values are True
• Confusing dictionary keys with values
• Expecting print to show dictionary instead of boolean

4. Identify the error in this pre-flight checklist code:

class PreFlight:
    def __init__(self):
        self.steps = {'battery': True, 'motors': True}
    def check_all(self):
        for step in self.steps:
            if self.steps[step] = False:
                return False
        return True

pf = PreFlight()
print(pf.check_all())

medium

A. Indentation error in for loop

B. Missing return statement in check_all method

C. Incorrect dictionary initialization syntax

D. Syntax error: '=' used instead of '==' in if condition

Solution

1. Step 1: Check the if condition syntax

   The line 'if self.steps[step] = False:' uses '=' which is assignment, not comparison.

2. Step 2: Correct syntax for comparison

   It should be '==' to compare values, so 'if self.steps[step] == False:' is correct.

3. Final Answer:

   Syntax error: '=' used instead of '==' in if condition -> Option D

4. Quick Check:

   Use '==' for comparison, '=' causes syntax error [OK]

Hint: Use '==' for comparison, not '=' [OK]

Common Mistakes:

• Using '=' instead of '==' in conditions
• Forgetting to return a value
• Misindenting loops or blocks

5. You want to extend the pre-flight checklist to automatically add a new step only if the drone has a camera. Which code snippet correctly adds this conditional step inside the class?

hard

A. self.steps['camera'] = self.has_camera

B. if self.has_camera == True:
self.steps['camera'] = True

C. self.steps['camera'] = True if self.has_camera else None

D. self.steps.append('camera') if self.has_camera else None

Solution

1. Step 1: Understand conditional addition of step

   We add 'camera' step only if self.has_camera is True.

2. Step 2: Check syntax for condition and dictionary update

   if self.has_camera == True: self.steps['camera'] = True uses 'if self.has_camera == True:' and sets self.steps['camera'] = True, which is clear and correct.

3. Final Answer:

   if self.has_camera == True: self.steps['camera'] = True -> Option B

4. Quick Check:

   Use if condition and dict assignment for conditional step [OK]

Hint: Use if condition with dict assignment for conditional steps [OK]

Common Mistakes:

• Using append on dictionary instead of assignment
• Assigning without condition
• Using wrong syntax for condition