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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

Python Basics easy

Swap Two Values

Implement a Python function that swaps two given values and returns them in swapped order.

variables assignment swap

Python Basics easy

Is divisible by?

Create a function that returns True if a is divisible by b with no remainder, with a clear definition of edge cases.

division modulo conditionals

Python Basics easy

Volume of Cube

Write a Python function that returns the volume of a cube given its side length.

arithmetic return function

Python Basics easy

Enumerate with start

Implement a function that mimics Python's enumerate with a custom start index.

enumerate loops tuples

Strings & Text easy

Find all indexes of a substring

Write a function that returns a list of all starting indexes where a substring appears in a string, including overlapping occurrences.

substring string searching

Strings & Text easy

Capitalize First Letter

Write a function that capitalizes the first letter of each word in a string.

string capitalization title

Strings & Text easy

Parse key=value pairs

Implement a parser that converts a space-separated 'key=value' string into a Python dictionary, supporting quoted values.

parsing strings dictionaries

OOP & Classes medium

Complex Number Class

Implement a Complex class supporting addition, subtraction, multiplication, division, equality, and string formatting.

classes magic-methods arithmetic

Iterators & Generators easy

Custom iterator class

Implement a custom iterator class that repeatedly yields elements from a list up to a given number of times.

iterator class cycle

Iterators & Generators easy

Range-like generator

Implement a custom generator that yields numbers like Python's range but with flexible bounds.

generator yield range

Iterators & Generators easy

File Line Reader Generator

Implement a generator function that reads a file-like object and yields each non-empty line without loading the whole file into memory.

generators file-io lazy-evaluation

Decorators & Context Managers easy

File Open Context Manager

Create a class that acts as a context manager for opening a virtual file in memory.

context-manager file-io python

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

Regular Expressions easy

Multiline anchor match

Extract lines beginning with a plain-text prefix from multiline strings using Python's re module.

regex anchors multiline

Binary Search medium

Interpolation Search

Implement interpolation search in Python on a sorted list of integers.

search sorted-array binary-search

Showing 15 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.