pythonLogic errorEasy

Zipping uneven lists silently drops unmatched trailing items

Time: 0:00

BugFind the bug and fix the code

What it should do

pair_users_and_badges(users, badges) pairs users with badges, filling missing values with "none". Example: pair_users_and_badges(["a", "b"], [1]) → [["a", 1], ["b", "none"]].

What happens instead

pair_users_and_badges(["a", "b", "c"], [1]) returns [["a", 1]] dropping users "b" and "c".

def pair_users_and_badges(users, badges):
    return [list(p) for p in zip(users, badges)]

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

⏱️0:00

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Hint 3

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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

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pythonLogic errorEasy

Zipping uneven lists silently drops unmatched trailing items

Time: 0:00

BugFind the bug and fix the code

What it should do

pair_users_and_badges(users, badges) pairs users with badges, filling missing values with "none". Example: pair_users_and_badges(["a", "b"], [1]) → [["a", 1], ["b", "none"]].

What happens instead

pair_users_and_badges(["a", "b", "c"], [1]) returns [["a", 1]] dropping users "b" and "c".

def pair_users_and_badges(users, badges):
    return [list(p) for p in zip(users, badges)]

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

Zipping uneven lists silently drops unmatched trailing items

What it should do

What happens instead

More logic errors to practise

Related errors

Zipping uneven lists silently drops unmatched trailing items

What it should do

What happens instead

More logic errors to practise

Related errors