Answer: Python Puzzler #3403

The answer is D. The program prints:

ribbit

This answer was checked by running the program for real.

Why?

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

Trace table

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

key	value
mouse	squeak
frog	ribbit
cat	meow
duck	quack

The code again

sounds = {
    "mouse": "squeak",
    "frog": "ribbit",
    "cat": "meow",
    "duck": "quack",
}
print(sounds["frog"])