keys(), values(), items(): Three Windows Into a Dictionary

How does items() hand you both halves of an entry at once, and why does = alias a dictionary where .copy() does not?

Finger exercises

Short drills on what this video just taught. Write the code, run the checks, and reveal the answer only if you are stuck.

0 / 5 passed

Exercise 1 of 5

Cast a view to a list

grades maps four students to their letter grades. Ask the dictionary for its values, turn what comes back into an ordinary list, and assign that list to value_list, keeping the entries in the order they were inserted.

(Hint: the object handed back prints in an unfamiliar way — list() converts any iterable into a list.)

grades = {"Ana": "B", "Matt": "A", "John": "B", "Katy": "A"}
value_list = ...  # your code here

grades = {"Ana": "B", "Matt": "A", "John": "B", "Katy": "A"}
value_list = ...  # your code here

Python runs in your browser

⌘/Ctrl + Enter runs

is a list, not a view object

holds every grade, in insertion order

←Previous Mutating a Dictionary: Add, Overwrite, del, and in Next Hashing and Immutable Keys: Why a List Can't Be a Key →