The answer is D. The program prints:
moo
This answer was checked by running the program for real.
Why?
A dictionary stores pairs: a key and its value. sounds["cow"] looks up the key ‘cow’ and gives back its value.
Trace table
A trace table follows the program step by step. Here’s this one:
| key | value |
|---|---|
| duck | quack |
| dog | woof |
| lion | roar |
| cow | moo |
The code again
sounds = {
"duck": "quack",
"dog": "woof",
"lion": "roar",
"cow": "moo",
}
print(sounds["cow"])Try it: change one number in the program and predict the new output before you run it.