ONE 6th FORM Python code and pseudocode

What does the code calculate, and how would you comment on the base case in Python?

• The code calculates the sum of numbers; the base case avoids infinite recursion.

• The code calculates the factorial of a number; the base case stops recursion.

• The code calculates the square of a number; the base case simplifies the calculation.

• The code calculates powers of a number; the base case ensures all numbers are included.

Modify the pseudocode to calculate the cubes instead of the squares. Which of these changes is correct?

• Replace OUTPUT i^2 with OUTPUT i^3.

• Add SET cube TO i^3 above the OUTPUT line.

• Replace FOR i FROM 1 TO 10 DO with FOR i FROM 1 TO 100 DO.

• Replace OUTPUT i^2 with OUTPUT i*i.

How would you add a comment explaining the purpose of the modulus operator in Python?

• # The modulus operator (%) checks if the number is even or odd.

• # The modulus operator (%) adds two numbers.

• # The modulus operator (%) finds the square root of a number.

• # The modulus operator (%) divides a number and rounds down.

Write a comment for the Python code explaining the purpose of the loop.

• # This loop adds all names to a list called names.

• # This loop counts the number of people in the list.

• # This loop greets each person by printing their name.

• # This loop calculates the total length of all names.

How would you comment the line total += num to explain what it does?

• # Checks if num is greater than the total variable.

• # Divides the total by num and updates it.

• # Multiplies num by the total and prints it.

• # Adds the value of num to the total variable.

What type of decision-making structure is used, and how could you comment it effectively?

• # A loop structure that checks numbers.

• # An if-elif-else decision structure to classify the number.

• # A recursive function that compares numbers.

• # A conditional statement that calculates square roots.

How would you comment the line if command == "exit": to explain its purpose?

• # Checks if the user wants to terminate the loop.

• # Skips the next iteration if "exit" is entered.

• # Ends the program immediately after this line.

• # Runs an infinite loop when "exit" is entered.

Add a comment to explain the calculation of the average. Which is correct?

• # Divides the total by the length of the list to get the mean.

• # Multiplies the total by the length of the list.

• # Divides the sum by 2 for an even split.

• # Adds the numbers and then subtracts the smallest one.

What does the code achieve, and how could you comment it to explain the use of list comprehensions?

• The code sums all elements of the matrix using list comprehensions.

• The code creates a new matrix that transposes rows into columns using list comprehensions.

• The code flattens the matrix into a single list.

• The code creates a 2x2 identity matrix.

What is the error in the pseudocode, and how would you correct it?

• Replace i MOD 2 = 1 with i MOD 2 = 0.

• Change SET total TO total + i to SET total TO total - i.

• Replace FOR i FROM 1 TO 20 DO with FOR i FROM 2 TO 20 STEP 2 DO.

• Both A and C are correct.