PyChallenge

Loading your exercises

+{{ xpPopup.amount }} XPstreakbonus!

Badge unlocked! {{ newBadge.name }}

{{ trackMilestoneHit.track.emoji }} {{ trackMilestoneHit.track.label }} {{ trackMilestoneHit.milestone }}% complete{{ trackMilestoneHit.milestone === 100 ? ' — finished!' : '' }}

{{ trackDone }}/{{ totalExercises }}

Appearance

Mode

Shortcuts

Run code{{ runKeyLong }}

Previous / next track[ ]

Undo a reset{{ isMacKey }}Z

Close menusEsc

Theme

Your Profile

Progress & stats

{{ Math.round(completedCount / totalExercises * 100) }}%

{{ completedCount }} / {{ totalExercises }}

exercises solved

🔥 {{ streak }} day streak {{ streakSafe ? 'Kept today' : 'At risk' }}

Your progress

{{ t.emoji }} {{ t.label }} {{ trackPct(t.id) }}%

{{ doneInTrack(t.id) }} / {{ trackCount(t.id) }} {{ trackCount(t.id) - doneInTrack(t.id) }} to go Complete

⚠️ Progress is local only

Clearing your browser wipes everything
Your {{ streak }}-day streak lives only here
{{ xp }} XP of progress has no backup
No sync across devices

Activate License to Protect Progress

Best streak

Active days

XP earned

Solved

Activity · {{ activeDays }} active day{{ activeDays === 1 ? '' : 's' }}

Less More

Achievements · {{ earnedBadges.length }}/{{ BADGES.length }}

Leaderboard

All-time rankings

{{ currentExercise ? currentExercise.topic : activeTrack.label }} {{ topicPos }}/{{ topicList.length }}

Exercises {{ EXERCISES.length }}

{{ currentExercise ? 'Continue where you left off' : 'Start here' }} {{ (currentExercise || nextInTrack(selectedTrack)).title }} {{ activeTrack.emoji }} {{ activeTrack.label }} · {{ (currentExercise || nextInTrack(selectedTrack)).topic }}

{{ completedCount }} solved {{ streak }} day streak {{ streakSafe ? '· kept today' : (streak ? '· at risk' : '') }} {{ xp }} XP Today {{ todayCount }}× combo!

{{ activeTrack.emoji }} {{ activeTrack.label }} · {{ browseCount }} match{{ browseCount === 1 ? '' : 'es' }}

{{ trackPct(selectedTrack) }}% done

{{ topic }} {{ exercises.filter(e => isCompleted(e.id)).length }}/{{ exercises.length }}

Nothing in this track matches “{{ search }}”.

Where you lose most time

Progress & streaks

{{ nextMilestone.left }} more to {{ nextMilestone.target }} solved {{ completedCount }} / {{ nextMilestone.target }}

Nearly finished

Last 12 weeks · {{ activeDays }} active day{{ activeDays === 1 ? '' : 's' }}

{{ currentExercise.difficulty }} +{{ currentExercise.xp }} XP

Expected output

{{ currentExercise.expectedOutput }}

💡 {{ i }}

{{ currentExercise.hints[i - 1] }}

Working solution

{{ solutionText }}

🐍

Pick an exercise to start

solution.py

⌘Z to undo

{{ pyodide ? 'Python 3.11 · Pyodide' : 'starting runtime' }} {{ runKeyLong }} to run Ln {{ cursor.line }}, Col {{ cursor.col }} UTF-8 Python

tap to open

Passed{{ lastEarned ? ' · +' + lastEarned + ' XP' : '' }}

Output doesn’t match