pythonLogic errorEasy

Summarizing stream twice causes generator to return zero sum

Time: 0:00

BugFind the bug and fix the code

What it should do

summarize_stream(numbers) returns a dictionary with the count and sum of numbers. Example: summarize_stream([10, 20]) → {"count": 2, "sum": 30}.

What happens instead

summarize_stream([10, 20]) returns {"count": 2, "sum": 0} with sum returning 0.

def summarize_stream(numbers):
    stream = (x for x in numbers)
    count = len(list(stream))
    total = sum(stream)
    return {"count": count, "sum": total}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

2:00 remaining

Take a moment to read the bug symptom and trace the code with Run & Check before unlocking Hint 1.

Hint 2

Unlocks after Hint 1

Hint 3

Unlocks after Hint 2

This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

<iframe src="https://trybughunt.com/embed/9b8263c4-01f8-47a0-beca-7435f8a7450e" title="Debugging challenge: Summarizing stream twice causes generator to return zero sum" width="100%" height="580" loading="lazy" style="border:1px solid #d4d4d8;border-radius:12px;max-width:760px"></iframe> <p style="font-size:14px">Debugging challenge from <a href="https://trybughunt.com/challenges/9b8263c4-01f8-47a0-beca-7435f8a7450e">TryBugHunt</a></p>

pythonLogic errorEasy

Summarizing stream twice causes generator to return zero sum

Time: 0:00

BugFind the bug and fix the code

What it should do

summarize_stream(numbers) returns a dictionary with the count and sum of numbers. Example: summarize_stream([10, 20]) → {"count": 2, "sum": 30}.

What happens instead

summarize_stream([10, 20]) returns {"count": 2, "sum": 0} with sum returning 0.

def summarize_stream(numbers):
    stream = (x for x in numbers)
    count = len(list(stream))
    total = sum(stream)
    return {"count": count, "sum": total}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

2:00 remaining

Take a moment to read the bug symptom and trace the code with Run & Check before unlocking Hint 1.

Hint 2

Unlocks after Hint 1

Hint 3

Unlocks after Hint 2

This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

Summarizing stream twice causes generator to return zero sum

What it should do

What happens instead

More logic errors to practise

Related errors

Summarizing stream twice causes generator to return zero sum

What it should do

What happens instead

More logic errors to practise

Related errors