In-Class Python Exercise 2

Exercise · Explain This Python Function (Shopping Cart Total)

Python · Beginner

Explain this code out loud like you're speaking during a technical interview. Focus on the list, loop, accumulator variable, and final calculation.

def calculate_total(prices):
    total = 0

    for price in prices:
        total = total + price

    return total

items = [10, 25, 5]

print(calculate_total(items))

🎯 Instructions oral task

Explain what the function does.
Describe what the prices parameter represents.
Explain how the for loop works.
Explain why the total variable starts at zero.
Explain what value gets returned.
Explain what gets printed to the console.

📖 Vocabulary core

list — a collection of multiple values stored in one variable.
loop — code that repeats multiple times.
iteration — one cycle of a loop.
accumulator — variable used to store and update a running total.
numeric value — a number used in calculations.
return statement — sends a value back from a function.

🧩 Collocations natural English

iterate through a list
calculate the total
store values in a variable
update the accumulator
return the final result
print the output

🗣️ Phrasal Verbs interview speech

loop through — “The program loops through the list of prices.”
add up — “The function adds up all the values.”
store in — “The result is stored in the total variable.”
give back — “The function gives back the final amount.”

🎤 Model Answer spoken

This function is called calculate_total. It takes one parameter called prices, which represents a list of numbers.

Inside the function, the variable total is initialized to zero. This variable acts as an accumulator to keep track of the running total.

Next, the for loop iterates through each value inside the list. During every iteration, the current price is added to the total variable.

After the loop finishes, the function returns the final total value.

The list contains the values 10, 25, and 5, so the final result is 40. The print() statement displays 40 in the console.