Group anagrams
Group words that are anagrams of each other.
First non-repeating character
Find the index of the first character that appears only once.
Group names by first letter
Given a list of names, return a dictionary mapping each first letter to all names starting with that letter in original order.
Keys Sorted by Value Descending
Given a dictionary mapping strings to integers, return a list of keys sorted by value descending, and when values tie, alphabetically ascending.
Anagram Dictionary Groups Lite
Group a list of words into anagrams using a dictionary keyed by sorted characters.
Anagram Groups by Size
Group a list of words into anagram groups and return them sorted by group size and lexicographically.
Top K Frequent Words
Given a list of words, return the k most frequent words sorted by frequency (descending) and then alphabetically.
Ransom Note Builder
Given two strings, determine if the ransom note can be formed from the words in the magazine.
Pivot sales by product
Write a function that pivots sales records into a dictionary keyed by product with monthly totals.
Showing 1–9 of 9 challenges · Dicts & Sets
Dicts & Sets — Python coding challenges
What you will find here
This page lists dicts & sets challenges — real Python problems you solve in the browser IDE with instant test feedback. Each challenge includes a clear brief, starter code, and automated checks.
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.