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

All Easy Medium Hard

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

Implement a function that returns the absolute difference between two numbers.

absolute value arithmetic function

Python Basics easy

Max of three numbers

Implement a function that returns the maximum of three numbers using comparisons.

conditionals comparison numbers

Python Basics easy

Sign of a number

Write a function sign_of_number that returns -1 for negatives, 0 for zero, and 1 for positives.

conditionals numbers comparison

Python Basics easy

Countdown printer

Implement a function that prints a countdown from a given number down to 1, then returns 'Go!'.

loops conditionals function-definition

Python Basics easy

Sum from 1 to n

Write a function that returns the sum of all integers from 1 to n (inclusive).

math arithmetic sum

Python Basics easy

Average of a list

Write a function that computes the average of a list of numbers, handling empty lists by returning 0.

average list statistics

Python Basics easy

Find Minimum Value

Write a function that returns the minimum integer from a given list.

Python Basics easy

Range of values

Calculate the range (max minus min) of a list of numbers. Empty list returns 0.

min max numbers

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

Area of Rectangle

Write a function that returns the area of a rectangle given its width and height.

arithmetic function numbers

Python Basics easy

Perimeter of triangle

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

arithmetic geometry basics

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

Modulo Remainder

Implement a function that returns the remainder of a divided by b without using the modulo operator.

modulo arithmetic integers

Python Basics easy

Print Pyramid Pattern

Implement a function that returns a centered asterisk pyramid as a list of strings.

loops strings pattern-printing

Python Basics easy

Last Digit Extractor

Write a function that returns the last digit of a non-negative integer using the modulo operator.

integers modulo arithmetic

Python Basics easy

Count word occurrences

Write a function that takes a sentence and returns a dictionary of word counts.

strings counting dictionaries

Python Basics easy

Find Missing Number

Given a list of n distinct integers from 0..n with one missing, return the missing number.

math integers arrays

Python Basics easy

Linear Search Implementation

Implement a linear search function that returns the index of the first occurrence of a target in a list, or -1 if not found.

linear-search list index

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

Count Leading Zeros

Write a function that returns the number of leading zeros in a list of integers.

lists iteration counting

Python Basics easy

Remove Duplicates from Sorted Array

Given a sorted list, remove duplicates in-place and return the new length.

lists in-place two-pointers

Python Basics easy

Copy deep vs shallow

Predict and write a function that returns a copied list and inspect whether nested modification affects the original.

copy nested mutation

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

Python Basics easy

Overlap two intervals

Given two closed intervals, return their overlap as a tuple or None if they do not overlap.

conditionals arithmetic intervals

Showing 25–48 of 255 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.