Answer: Python Puzzler #1864

The answer is D. The program prints:

woof

Checked by running the program for real.

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

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

sounds = {
    "dog": "woof",
    "frog": "ribbit",
    "lion": "roar",
    "duck": "quack",
}
print(sounds["dog"])

Try it: change one number in the program and predict the new output before you run it.