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
Decorators & Context Managers easy

Timing Decorator

Implement a decorator that prints the execution time of a function.

decorators time performance
+10 pts 15m
Decorators & Context Managers easy

Context Manager Class

Implement a context manager class that measures execution time and sets duration, with None if an exception occurred.

context-manager classes timing
+8 pts 12m
Decorators & Context Managers medium

Profile time decorator

Create a decorator that tracks how many times a function is called and its cumulative execution time.

decorators timing profiling
+20 pts 20m
Decorators & Context Managers easy

Timer Context Manager

Implement a context manager that measures execution time of a with block and stores it.

context-manager timing measurement
+10 pts 15m
Decorators & Context Managers easy

Context Decorator Dual

Implement a timing decorator and a context manager that both record elapsed time in seconds.

decorator context-manager time
+10 pts 15m
Decorators & Context Managers medium

Benchmark decorator

Implement a benchmarking decorator that records call count and timing statistics per function.

decorators timing functools
+25 pts 25m
Cryptography & Hashing easy

Constant Time Compare

Write a function that compares two strings without leaking length or content via timing.

constant-time security comparison
+10 pts 15m
Cryptography & Hashing easy

Constant time compare

Write a function that compares two strings in constant time to avoid timing attacks.

timing-safe security strings
+8 pts 10m

Showing 1–8 of 8 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

  1. Pick a category — basics, algorithms, strings, and more
  2. Open a challenge, read the statement, and edit the starter code
  3. 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.