Maintenance

Site is under maintenance — quizzes are still available.

Sponsored Reserved space — layout preview until AdSense is connected

Practice Arena

Python Coding
Challenges

Write real Python in the browser. Instant feedback. From beginner to expert.

56 challenges 25 easy 23 medium 8 hard

All Easy Medium Hard

Sponsored Reserved space — layout preview until AdSense is connected

All Python Basics Strings & Text Lists & Arrays Dicts & Sets Functions & Closures OOP & Classes Data Structures & Algorithms Advanced Python

Lists & Arrays easy

Two Sum

Return indices (i, j) with i < j such that nums[i] + nums[j] == target.

dict complement

Dicts & Sets easy

Word frequency

Return a dict mapping each word to its count in the sentence.

Dicts & Sets easy

First non-repeating character

Find the index of the first character that appears only once.

dict strings counter

Dicts & Sets easy

Most frequent element

Return the element that appears most often in a list.

Showing 4 challenges · easy