Simple Interest Calculator
Implement a function that calculates simple interest given principal, annual rate, and time in years.
Tip Calculator
Write a function that calculates the total bill after adding a given tip percentage.
Absolute Difference
Implement a function that returns the absolute difference between two numbers.
Max of three numbers
Implement a function that returns the maximum of three numbers using comparisons.
Sign of a number
Write a function sign_of_number that returns -1 for negatives, 0 for zero, and 1 for positives.
Countdown printer
Implement a function that prints a countdown from a given number down to 1, then returns 'Go!'.
Sum from 1 to n
Write a function that returns the sum of all integers from 1 to n (inclusive).
Average of a list
Write a function that computes the average of a list of numbers, handling empty lists by returning 0.
Find Minimum Value
Write a function that returns the minimum integer from a given list.
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.
Round to nearest ten
Write a function that rounds any integer to the nearest multiple of ten.
Fahrenheit to Celsius
Implement a function that converts degrees Fahrenheit to degrees Celsius.
Speed Converter
Write a function to convert speeds between kilometers per hour and meters per second.
Area of Rectangle
Write a function that returns the area of a rectangle given its width and height.
Circle Circumference Calculator
Implement a function that computes the circumference of a circle from its radius using the formula 2πr.
Volume of Cube
Write a Python function that returns the volume of a cube given its side length.
Modulo Remainder
Implement a function that returns the remainder of a divided by b without using the modulo operator.
Print Pyramid Pattern
Implement a function that returns a centered asterisk pyramid as a list of strings.
Last Digit Extractor
Write a function that returns the last digit of a non-negative integer using the modulo operator.
Count word occurrences
Write a function that takes a sentence and returns a dictionary of word counts.
Map, Filter, Reduce
Implement three functions using map, filter, and reduce to manipulate a list of integers.
Variadic Sum Function
Implement a variadic function that sums an arbitrary number of numeric arguments.
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.
Garbage Collection Hint
Write a function that predicts when an object is garbage collected based on reference counting.
Showing 25–48 of 365 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.