Leap Year Checker
Implement a function that decides whether a year is a leap year according to the standard Gregorian rules.
Is a multiple of both
Write a function that returns True if a number is divisible by both of two given divisors.
Boolean from comparison chain
Implement a function that evaluates a chain of comparisons and returns the boolean result.
Toggle a boolean n times
Apply boolean toggling n times and return the final boolean value.
Boolean Mask Filter
Write a function that filters a list based on a boolean mask and returns the selected elements.
Leap Year Checker
Implement a function that returns True if a year is a leap year according to the Gregorian calendar rules.
Subset of another set
Write a function that checks if every element of one set is contained in another.
Sieve of Eratosthenes
Implement the Sieve of Eratosthenes to return a sorted list of all primes up to a given integer n.
Check Power of Two Bits
Implement is_power_of_two(n) that returns True if n is a power of two and False otherwise.
Showing 9 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.