Answer: Python Puzzler #3433

The answer is C. The program prints:

19

This answer was checked by running the program for real.

Why?

The loop remembers the biggest number it has seen so far, and replaces it whenever it finds a bigger one. This is how computers find the maximum.

Trace table

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

n	n > biggest?	biggest
14	yes	14
19	yes	19
7	no	19
16	no	19
2	no	19

The code again

numbers = [14, 19, 7, 16, 2]
biggest = 0
for n in numbers:
    if n > biggest:
        biggest = n
print(biggest)