Clamp a Number to a Range
Implement a clamp function that returns a value within a specified range.
Min of three numbers
Write a function that returns the minimum of three integers.
Sum numbers from 1 to n
Implement a function that computes the sum of all integers from 1 to n.
Sign of a Number
Write a function that returns the sign of a number as a string.
Max of a variable-length list
Implement a function that returns the maximum value from a list of numbers without using max().
Replace negatives with zero
Implement a function that replaces all negative numbers in a list with zero.
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.
Average of a list
Write a function that computes the average of a list of numbers, handling empty lists by returning 0.
Count Positives
Count the positive numbers in a list of integers.
Range of values
Calculate the range (max minus min) of a list of numbers. Empty list returns 0.
Area of Rectangle
Write a function that returns the area of a rectangle given its width and height.
Digit Count
Count the number of digits in an integer using arithmetic, without string conversion.
Palindromic Number Check
Write a function to check if a given integer is a palindrome.
Parse environment variables
Write parse_env_vars that parses KEY=VALUE lines into a dict, converting booleans/numbers and ignoring comments.
Array mean and std
Implement the function array_stats that returns the mean and population standard deviation of a list of numbers.
Cumulative Sum Vectorized
Implement a function that returns the cumulative sum of a list of numbers.
Percentile Calculation
Given a list of numbers and a target value, return the percentile rank of that value in the list.
Camel case to snake case
Write a function that converts camelCase input to snake_case while handling acronyms and numbers correctly.
Find all numbers in text
Write a function that extracts all standalone integers from a text string using regular expressions.
Parse range notation
Parse a comma-separated list of ranges and individual numbers, expanding each range into its full sequence.
Move Zeros to the End
Reorder a list in-place, pushing all zeros to the end while preserving the order of non-zero numbers.
Difference of Consecutive Elements
Given a list of numbers, return a new list where each element is the difference between consecutive elements.
Showing 1–24 of 42 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.