Peak Element in Array
Implement a function that returns the index of any peak element in a list of integers.
Merge Two Sorted Lists
Write a function that merges two sorted lists into a single sorted list.
Jump Search
Implement the jump search algorithm to locate a target in a sorted list, returning its index or -1.
Delete Old Records
Filter a list of records by removing those with a date older than a given cutoff date.
Consecutive available seats
Given a list of seat statuses, return the length of the longest consecutive run of available (0) seats.
Argsort Indices
Implement a function that returns the indices that would sort a list of integers, with ties broken by original order.
Lowest Common Ancestor in a Binary Search Tree
Implement a function to find the lowest common ancestor of two node values in a binary search tree.
Memory view slice
Implement chunk_list that splits a list into consecutive sublists of a given chunk size.
Employees earning more than manager
Given employee records with manager IDs, find those who earn more than their direct manager.
Infinite counter generator
Create an infinite counter starting from `start`, stepping by `step`.
Async Context Manager Lifecycle
Build an async context manager class that tracks acquisition and ensures cleanup.
Default Argument Trap
Implement a function that safely accumulates items without the classic mutable default argument bug.
Custom iterator class
Implement a custom iterator class that repeatedly yields elements from a list up to a given number of times.
Generator Pipeline
Implement a generator function that yields only even numbers from an input list, squared.
Range-like generator
Implement a custom generator that yields numbers like Python's range but with flexible bounds.
Fibonacci Generator
Create a generator function that yields Fibonacci numbers from 0 upward until a given limit.
Window Iterator
Implement a generator that yields consecutive windows of a given size from any iterable.
Pairwise Sequence Pairs
Write a generator function pairwise that yields each consecutive overlapping pair from any iterable as lists.
Groupby Consecutive
Write a generator function that yields (value, list_of_occurrences) for each run of consecutive equal items.
Collatz Generator
Implement a generator function that yields the Collatz sequence starting from a given positive integer.
Digit Expansion Generator
Create a generator that lazily yields each decimal digit of a non-negative integer from most significant to least significant.
File Line Reader Generator
Implement a generator function that reads a file-like object and yields each non-empty line without loading the whole file into memory.
Tree inorder generator
Write a generator function that yields a binary tree's node values in inorder traversal.
Yield from delegation
Implement a generator that flattens nested iterables of any depth using `yield from`.
Showing 313–336 of 556 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.