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

Absolute Difference of Two Integers

Compute the absolute difference between two integers, regardless of order.

absolute difference math

Python Basics easy

Grade Calculator

Implement a function that converts a numeric score to a letter grade using a standard scale.

conditionals functions basic-syntax

Python Basics easy

Simple Interest Calculator

Implement a function that calculates simple interest given principal, annual rate, and time in years.

arithmetic floats basics

Python Basics easy

Tip Calculator

Write a function that calculates the total bill after adding a given tip percentage.

arithmetic rounding basics

Python Basics easy

Count Positives

Count the positive numbers in a list of integers.

conditionals loops basic

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

Perimeter of triangle

Given three side lengths, return the perimeter (sum) of the triangle.

arithmetic geometry basics

Python Basics easy

Circle Circumference Calculator

Implement a function that computes the circumference of a circle from its radius using the formula 2πr.

math function basics

Python Basics easy

Pathlib Operations: File Path Basics

Practice using pathlib to manipulate file paths and extract components.

pathlib file-paths strings

Python Basics easy

Count trailing zeros

Write a function that counts the number of trailing zeros in the decimal representation of a positive integer.

loops integers basics

Python Basics easy

Guess Number Game

Simulate a number guessing game with attempts, feedback, and a win/lose result.

loops conditionals functions

Python Basics medium

Basic Calculator

Implement a function that evaluates a simple arithmetic expression with +, -, *, / and parentheses.

calculator parsing math

Python Basics easy

Take n Items

Given a list and a non-negative integer n, return a new list containing the first n elements.

slicing list basics

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

Find substring index

Implement a function that returns the starting index of the first occurrence of a substring using only basic string indexing and slicing.

string search index

Strings & Text hard

Basic Calculator III

Implement a recursive descent parser to evaluate a fully parenthesized arithmetic expression with +, -, *, / and parentheses.

parsing string expression

Lists & Arrays easy

Middle Element of an Odd-Length List

Implement a function that returns the middle element of an odd-length list.

lists indexing basic

OOP & Classes easy

Event emitter basics

Implement an EventEmitter class with subscribe/emit/unsubscribe functionality.

oop callbacks events

OOP & Classes easy

Rectangle class

Implement a Rectangle class with properties, methods, and special methods for basic geometry and comparison.

classes magic-methods geometry

Data Structures & Algorithms medium

Basic Calculator II

Evaluate a basic arithmetic expression with +, -, *, / following operator precedence.

string stack 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

Showing 1–21 of 21 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.