Answer: Python Puzzler #840

The answer is A. The program prints:

pear
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 -2 means item number 2 from the end.

Trace table

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

positionnegative positionitem
0-5melon
1-4banana
2-3grape
3-2pear
4-1plum

The code again

basket = ["melon", "banana", "grape", "pear", "plum"]
print(basket[-2])

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