Answer: Python Puzzler #2670

The answer is A. The program prints:

carrot

This answer was 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 -4 means item number 4 from the end.

Trace table

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

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

The code again

basket = ["mango", "carrot", "melon", "pear", "apple"]
print(basket[-4])

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