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

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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

Validate date format

Return True if input string is exactly YYYY-MM-DD and a real calendar date.

validation strings dates

Python Basics easy

Validate Password Strength

Implement a function that validates password strength based on clear rules.

strings validation conditions

Strings & Text easy

Validate username format

Implement a function that validates a username according to length, allowed characters, and no consecutive underscores.

strings validation returns

Dicts & Sets easy

Revenue by Month

Write a function that groups a list of (date, amount) pairs by year-month and returns total revenue per month as a sorted dictionary.

dict aggregation sales

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

Regular Expressions easy

Validate Hex Color Code

Write a function that validates hex color codes using regular expressions.

regex validation strings

Datetime & Time Calculations easy

Days Between Dates

Write a function that returns the number of days between two given dates.

datetime date-arithmetic calendar

Datetime & Time Calculations easy

Age in years months days

Given birth and reference dates, return age as a dictionary with years, months, days.

datetime date arithmetic age calculation

Datetime & Time Calculations easy

Business days between

Calculate the number of business days (Mon-Fri) between two dates, inclusive of both endpoints.

datetime weekdays date-arithmetic

Showing 1–9 of 9 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.