Practice Arena

Python Coding
Challenges

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

925 challenges 556 easy 323 medium 46 hard

All Easy Medium Hard

All Python Basics Strings & Text Lists & Arrays Dicts & Sets Functions & Closures OOP & Classes Data Structures & Algorithms Advanced Python Iterators & Generators Decorators & Context Managers Error Handling & Exceptions Regular Expressions Math & Number Theory Bit Manipulation Dynamic Programming Trees & Binary Trees Graphs & Graph Algorithms Recursion & Backtracking Greedy Algorithms Binary Search Two Pointers & Sliding Window Stacks & Queues Heaps & Priority Queues Linked Lists Matrix & 2D Arrays Datetime & Time Calculations Data Formats & Parsing SQL & SQLite Numpy & Vectorized Computing Cryptography & Hashing

Strings & Text medium

Longest common prefix

Find the longest common prefix among a list of strings.

Lists & Arrays easy

Zip lists into pairs

Write a function that takes two lists and returns a list of two-element sublists pairing elements by index up to the shortest length.

zip lists pairs

Lists & Arrays easy

Unzip pairs into two lists

Write a function that takes a list of pairs and returns two separate lists: first elements and second elements.

zip unpacking lists

Lists & Arrays easy

Zip Two Lists

Write a function that pairs elements from two lists by index, stopping at the shorter list.

zip lists pairs

Iterators & Generators easy

Zip Longest Fill

Create an iterator that yields lists from multiple iterables, padding with a fill value when lengths differ.

generators zip iteration

Linked Lists medium

Zip two linked lists

Interleave values from a and b until both are exhausted.

linked-list lists pointers

Showing 1–6 of 6 challenges

Guide: free Python coding challenges

Practice Python by solving problems

PythonSkillset challenges are hands-on coding exercises from beginner to advanced. Open a challenge, read the problem, write Python in the split-pane editor, and run tests with Pyodide — no install required.

How to use the arena

Pick a category — basics, algorithms, strings, and more
Open a challenge, read the statement, and edit the starter code
Run tests, fix failures, then try a related quiz or tutorial lesson

Challenges vs tutorials and quizzes

Challenges test what you can build under constraints. For guided teaching, use our Python tutorials. For quick checks, try quizzes or copy snippets from code samples.