Claude Fable 5

The bug is division by zero when an empty list is passed. len(nums) is 0, causing total / len(nums) to raise a ZeroDivisionError.

Here's the fixed version:

def average(nums):
    if not nums:
        return 0  # or raise ValueError("Cannot compute average of empty list")
    total = 0
    for n in nums:
        total += n
    return total / len(nums)

print(average([]))

The fix checks if the list is empty before computing the average. Returning 0 is one option; alternatively, you could raise an exception or return None depending on what makes sense for your use case.