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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

Even or odd?

Return 'even' or 'odd' for an integer.

modulo conditionals

Python Basics easy

Sum of digits

Return the sum of all decimal digits of a non-negative integer.

arithmetic loops

Python Basics easy

GCD via Euclid

Compute the greatest common divisor of two positive integers.

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 from Score

Write a function that maps a numeric score to its letter grade using standard grading thresholds.

conditionals functions integers

Python Basics easy

Min of three numbers

Write a function that returns the minimum of three integers.

min comparison function

Python Basics easy

Integer division and remainder

Write a function that performs integer division and returns both quotient and remainder.

operators division remainder

Python Basics easy

Sum numbers from 1 to n

Implement a function that computes the sum of all integers from 1 to n.

sum loop arithmetic

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

Digit count of an integer

Given an integer, return the number of digits it has, handling negatives and zero correctly.

integers loops arithmetic

Python Basics easy

Count Multiples in a Range

Given a start, end, and divisor, count how many integers in [start, end] are divisible by the divisor.

multiples range divisibility

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

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

Round to nearest ten

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

arithmetic rounding integers

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

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

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

Palindromic Number Check

Write a function to check if a given integer is a palindrome.

numbers strings conditionals

Python Basics easy

Hexagonal Number

Write a function to check if a positive integer is a hexagonal number.

math loops conditionals

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

Count Leading Zeros

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

lists iteration counting

Showing 1–24 of 163 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.