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Python Coding
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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

Sum of digits

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

arithmetic loops

Python Basics easy

Collatz steps

Count how many steps the Collatz sequence takes to reach 1 from n.

Python Basics easy

Factorial (iterative)

Compute n! iteratively without recursion.

Python Basics easy

Prime checker

Return True if n is a prime number.

Python Basics easy

Count down from n

Implement a function that returns a list from n down to 1.

loops range lists

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

Multiplication Table Row

Return the nth row of a multiplication table as a list of 1..n products.

loops lists multiplication

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

Max of a variable-length list

Implement a function that returns the maximum value from a list of numbers without using max().

conditionals loops comparison

Python Basics easy

Replace negatives with zero

Implement a function that replaces all negative numbers in a list with zero.

lists loops conditionals

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

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

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

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

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

Enumerate with start

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

enumerate loops tuples

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

Convolve 1D signal

Implement a 1D convolution function with three modes using pure Python.

convolution arrays loops

Python Basics easy

Guess Number Game

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

loops conditionals functions

Python Basics easy

Filter by Age

Filter a list of person dictionaries by age and return their names.

loops conditionals dictionaries

Python Basics easy

Broadcast Add Scalar

Add a scalar to every number in a 2D list and return a new 2D list without modifying the original.

nested-loops addition lists

Showing 1–24 of 49 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.