Project 4: Grade Calculator with Lists

Project 4: Grade Calculator with Lists

Collect a list of scores and print the average, highest, and lowest.

The goal

Keep typing scores until the user enters -1, then show the average, min, and max.

What you practice

• Lists and append()
• while loops
• sum(), min(), max()
• len()

Starter code

scores = []

while True:
    value = input("Enter a score (-1 to stop): ")
    if value == "-1":
        break
    scores.append(int(value))

print("You entered", len(scores), "scores")

Step-by-step

1. Run the starter and enter a few scores.
2. Compute average = sum(scores) / len(scores).
3. Print min(scores) and max(scores).
4. Guard against dividing by zero if no scores were entered.
5. Wrap the int conversion in a try/except.

Checklist

• [ ] Scores are stored in a list
• [ ] -1 stops the loop
• [ ] The average is a float
• [ ] Min and max are shown
• [ ] An empty list doesn't crash
• [ ] Bad input is handled

TL;DR

• append() grows the list.
• sum(), min(), max() summarize it.
• Guard division when the list is empty.