Ex 20: Loyalty Points Tracker

Problem​

Build a loyalty points tracker for a retail store. The system needs to track points across all customers and handle bonuses for large transactions.

Rules​

• Define a global variable loyalty_points.
• Create process_transactions(transactions: list[int]) -> int.
• Use a nested function apply_bonus() to add ₹50 to the total if it's over ₹1000.
• Use nonlocal and global appropriately.

Boilerplate​

Copy below code and paste to our IDE for head start.

# Write our code inside this function
loyalty_points: int = 0

def process_transactions(transactions: list[int]) -> int:
    pass # remove this

# Call with test data
print(process_transactions([400, 700]))

Expected Output​

1150

Solution​

Only view the solution after trying our best.

loyalty_points: int = 0

def process_transactions(transactions: list[int]) -> int:
    total = sum(transactions)

    def apply_bonus():
        # Update the parent function's variable
        nonlocal total
        if total > 1000:
            total += 50

    apply_bonus()

    # Update the global points tracker
    global loyalty_points
    loyalty_points += total // 100

    return total

# Test data
print(process_transactions([400, 700]))