Practice Arena

Python Coding
Challenges

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467 challenges 330 easy 120 medium 17 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

Advanced Python medium

Retry decorator

Implement @retry(times=3) that retries a function on exception.

decorators error-handling

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

Error Handling & Exceptions easy

Safe Integer from String

Implement safe_int that converts a string to an integer, returning a default value on any failure, with support for an optional base.

exceptions parsing default-value

Error Handling & Exceptions easy

Safe int parser

Implement safe_parse_int that converts a string to an int, returning a default value on failure.

exceptions parsing validation

Error Handling & Exceptions easy

Safe Float Parser

Write a function that safely converts a string to a float, returning None for invalid inputs.

float exception parsing

Error Handling & Exceptions easy

Divide with zero check

Write a function that safely divides two numbers, catching division by zero.

exceptions division error-handling

Error Handling & Exceptions easy

Key error handler

Implement a safe dictionary access function that returns a default value on missing keys.

exceptions dict fallback

Error Handling & Exceptions easy

Else on try block

Implement a function that uses try-except-else to safely divide two numbers and return a result or error description.

exception-handling try-except-else division

Showing 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

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.