Parse Version SemVer
Write a function that parses a semantic version string into its numeric components.
Parse path segments
Implement a function that parses a path string into clean segments, ignoring slashes, empty parts, and dot segments.
Parse Boolean Strings
Implement a function that parses a boolean string into a Python bool, handling True/False/Yes/No/1/0 case-insensitively.
Parse Hex Dump
Write a function that parses a hex dump string into a list of integers.
Caesar Cipher Decrypt
Write a function that decrypts a Caesar cipher by shifting letters backward by a given key.
Chunk a list into n-sized parts
Write a function that divides a list into sublists of at most n elements.
Rotate Left by k
Implement a function that rotates a list left by k positions.
Interleave Two Lists
Write a function that interleaves two lists element by element, preserving order.
Running Maximum
Implement a function that returns a list where each element is the largest value seen so far.
Insert into a Sorted List
Implement a function that inserts a value into a sorted list at the correct position using binary search.
Zip lists into pairs
Write a function that takes two lists and returns a list of two-element sublists pairing elements by index up to the shortest length.
Middle Element of an Odd-Length List
Implement a function that returns the middle element of an odd-length list.
Is Subset of Another List
Write a function that returns True if every element in a given list exists in another list, ignoring duplicates.
Unzip pairs into two lists
Write a function that takes a list of pairs and returns two separate lists: first elements and second elements.
Generate a Multiplication Table
Build a function that returns an n x n multiplication table as a list of lists.
Majority Element Finder
Implement a function that returns the majority element in a list, which appears more than half the time.
Union of Two Lists
Implement a function that combines two lists and returns only unique elements.
Difference of Two Lists
Write a function that returns items in list a that are not in list b, preserving order and duplicates.
Chunk list into groups
Implement a function that splits a list into sublists of a given size.
Zip Two Lists
Write a function that pairs elements from two lists by index, stopping at the shorter list.
Partition Array
Implement a function that finds a contiguous partition of a list into k groups, minimizing the maximum sum of the groups.
Rearrange Positives and Negatives
Write a function that rearranges a list in-place so all negative numbers come before non-negative numbers.
Last occurrence index
Implement a function that returns the last index of a given value in a list, or -1 if the value is not present.
Image channel swap
Implement a function that swaps the red and blue channels of an RGB image.
Showing 121–144 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.