Practice Arena

Python Coding
Challenges

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925 challenges 556 easy 323 medium 46 hard

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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

Functions & Closures easy

Bind First Argument

Implement bind_first_arg, a decorator that fixes the first argument of any function.

decorators closures functions

Decorators & Context Managers easy

Once Decorator: Run a Function Only Once

Implement a decorator that caches and returns the result of the first call for subsequent calls.

decorators closures caching

Decorators & Context Managers easy

Timing Decorator

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

decorators time performance

Decorators & Context Managers easy

Print Args Decorator

Write a decorator that prints function name and arguments, then returns the original result.

decorators functions wrappers

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

Decorators & Context Managers easy

Count calls decorator

Implement a decorator that counts and reports how many times the wrapped function is called.

decorator closure function

Decorators & Context Managers easy

Log Calls Decorator

Create a decorator that prints call details and returns the original result.

decorators logging function-wrappers

Decorators & Context Managers easy

Class-based decorator with call validation

Build a class-based decorator that validates a single argument's type and logs successful invocation.

decorators class validation

Showing 1–8 of 8 challenges · easy

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.