Answer: Python Puzzler #3573

The answer is B. The program prints:

51

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
46	yes	46
51	yes	51
33	no	51
11	no	51
37	no	51

The code again

numbers = [46, 51, 33, 11, 37]
biggest = 0
for n in numbers:
    if n > biggest:
        biggest = n
print(biggest)