Merge dicts summing values
Write a function that merges two dictionaries by summing values for duplicated keys.
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.
Missing keys default zero
Write a function to sum numeric values from dictionaries, treating missing keys as zero.
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.
Common Keys of Two Dictionaries
Implement a function that finds keys shared by two dictionaries and returns them sorted.
Mode of a list via counting
Implement a function that returns the mode of a list, resolving ties by the element that appears first.
Sort by frequency
Sort a list by element frequency descending, with ties broken by order of first occurrence.
Showing 7 challenges · easy · Dicts & Sets
Dicts & Sets — Python coding challenges
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