Answer: Python Puzzler #1738

The answer is D. The program prints:

roar

Checked by running the program for real.

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

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

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

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