Answer: Python Puzzler #3653

The answer is D. The program prints:

woof

This answer was checked by running the program for real.

Why?

A dictionary stores pairs: a key and its value. sounds["dog"] looks up the key ‘dog’ and gives back its value.

Trace table

A trace table follows the program step by step. Here’s this one:

key	value
frog	ribbit
mouse	squeak
dog	woof
sheep	baa

The code again

sounds = {
    "frog": "ribbit",
    "mouse": "squeak",
    "dog": "woof",
    "sheep": "baa",
}
print(sounds["dog"])