Answer: Python Puzzler #691

The answer is C. The program prints:

apple
What the program prints
Checked by running the program for real.

Why?

A negative position counts from the end: -1 is the last item, -2 the one before it. So -3 means item number 3 from the end.

Trace table

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

positionnegative positionitem
0-6pear
1-5plum
2-4mango
3-3apple
4-2carrot
5-1melon

The code again

basket = ["pear", "plum", "mango", "apple", "carrot", "melon"]
print(basket[-3])

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