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

Python Basics easy

Seconds to Hours Minutes Seconds

Convert total seconds into a zero-padded HH:MM:SS format.

arithmetic divmod formatting

Python Basics easy

Hello, name!

Implement a function that returns a personalized greeting for a given name.

strings function formatting

Python Basics easy

Minutes to Hours: Time Conversion Helper

Write a function that converts minutes into a human-readable 'Xh Ym' string, with special cases for zero and whole hours.

arithmetic formatting conditionals

Strings & Text easy

Center a string in a width

Write a function that centers a string within a specified width by adding spaces on both sides.

strings padding formatting

Strings & Text easy

Abbreviate Name

Create a function that takes a full name and returns an abbreviated version with initials and the last name.

strings formatting split

Strings & Text easy

Snake case converter

Implement a function that converts a string to snake_case according to given rules.

strings snake_case formatting

Strings & Text easy

Error message formatter

Write a function that constructs a formatted error message from a code, an optional context, and a fallback message.

formatting strings function

Strings & Text easy

Parse Log Line

Write a function that parses a log line and returns a dictionary with timestamp, level, and message.

string-parsing split strip

Strings & Text easy

User Friendly Message

Given a raw user input, format it into a single clean sentence with proper sentence case and trimming.

strings formatting cleaning

OOP & Classes medium

Complex Number Class

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

classes magic-methods arithmetic

Regular Expressions medium

Match Credit Card Pattern

Write a function that validates a credit card number string against a set of formatting rules.

regex validation credit-card

Datetime & Time Calculations easy

Format date output

Parse ISO date strings and format them into a friendly US-style date output.

datetime string-formatting date-parsing

Datetime & Time Calculations easy

Duration Human Readable

Write a function that turns a number of seconds into a human-readable duration like '2 hours, 1 minute'.

datetime strings formatting

Datetime & Time Calculations easy

Month Start Date

Parse a date string and return the first day of its month in the same format.

datetime date-parsing formatting

Data Formats & Parsing medium

Serialize dict to TOML-like

Convert nested Python dicts into a simplified TOML-like string with sorted keys, type-aware formatting, and flat table sections.

dict toml serialization

Showing 1–15 of 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.