Answer: Python Puzzler #2578

The answer is C. The program prints:

mango

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 -5 means item number 5 from the end.

Trace table

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

positionnegative positionitem
0-5mango
1-4apple
2-3carrot
3-2plum
4-1grape

The code again

basket = ["mango", "apple", "carrot", "plum", "grape"]
print(basket[-5])

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