FizzBuzz, precisely
Return a newline-separated string for 1..n: Fizz, Buzz, FizzBuzz, or the number.
Temperature converter
Convert Celsius to Fahrenheit: F = C × 9/5 + 32.
Even or odd?
Return 'even' or 'odd' for an integer.
Sum of digits
Return the sum of all decimal digits of a non-negative integer.
Collatz steps
Count how many steps the Collatz sequence takes to reach 1 from n.
Factorial (iterative)
Compute n! iteratively without recursion.
Power of two?
Return True if n is an exact power of 2.
GCD via Euclid
Compute the greatest common divisor of two positive integers.
Fibonacci(n)
Return the nth Fibonacci number efficiently.
Prime checker
Return True if n is a prime number.
Compound interest
Return the future balance after compound interest, rounded to two decimals.
Clamp a Number to a Range
Implement a clamp function that returns a value within a specified range.
Absolute Difference of Two Integers
Compute the absolute difference between two integers, regardless of order.
Leap Year Checker
Implement a function that decides whether a year is a leap year according to the standard Gregorian rules.
Grade from Score
Write a function that maps a numeric score to its letter grade using standard grading thresholds.
Min of three numbers
Write a function that returns the minimum of three integers.
Integer division and remainder
Write a function that performs integer division and returns both quotient and remainder.
Count down from n
Implement a function that returns a list from n down to 1.
Sum numbers from 1 to n
Implement a function that computes the sum of all integers from 1 to n.
Multiplication Table Row
Return the nth row of a multiplication table as a list of 1..n products.
Sign of a Number
Write a function that returns the sign of a number as a string.
Seconds to Hours Minutes Seconds
Convert total seconds into a zero-padded HH:MM:SS format.
Is a multiple of both
Write a function that returns True if a number is divisible by both of two given divisors.
Digit count of an integer
Given an integer, return the number of digits it has, handling negatives and zero correctly.
Showing 1–24 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.