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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

Count Positives

Count the positive numbers in a list of integers.

conditionals loops basic

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

Round to nearest ten

Write a function that rounds any integer to the nearest multiple of ten.

arithmetic rounding integers

Python Basics easy

Fahrenheit to Celsius

Implement a function that converts degrees Fahrenheit to degrees Celsius.

temperature arithmetic conversion

Python Basics easy

Speed Converter

Write a function to convert speeds between kilometers per hour and meters per second.

arithmetic conversion function

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

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

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

Digit Count

Count the number of digits in an integer using arithmetic, without string conversion.

numbers loops math

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

Map, Filter, Reduce

Implement three functions using map, filter, and reduce to manipulate a list of integers.

map filter reduce

Python Basics easy

Variadic Sum Function

Implement a variadic function that sums an arbitrary number of numeric arguments.

functions args sum

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

Pathlib Operations: File Path Basics

Practice using pathlib to manipulate file paths and extract components.

pathlib file-paths strings

Python Basics easy

Garbage Collection Hint

Write a function that predicts when an object is garbage collected based on reference counting.

garbage-collection reference-counting object-lifecycle

Python Basics easy

Enumerate with start

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

enumerate loops tuples

Python Basics easy

Validate date format

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

validation strings dates

Showing 49–72 of 925 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.