Python debugging challenge

Read the error, find the cause

Debugging means systematically locating and correcting defects. Syntax errors prevent parsing; runtime errors arise while a program runs; logic errors produce incorrect results.

scores = [12, 15, 9]
total = 0
for score in scores:
    total = score
mean = total / len(scores)
print(mean)

The program runs but the output is incorrect. Fix the logic error without using sum().

scores = [12, 15, 9]
total = 0
for score in scores:
    total += score
mean = total / len(scores)
print(mean)  # 12.0

Extension

Adapt the program to deal safely with an empty list.

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