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