Answer: Python Puzzler #1436

The answer is B. The program prints:

2
4
6
8
10
12
14
16

Why?

% gives the remainder after dividing. A remainder of 0 means the number divides exactly by 2, so the program prints the multiples of 2 up to 16.

Trace table

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

number	number % 2	printed?
1	1
2	0	yes
3	1
4	0	yes
5	1
6	0	yes
7	1
8	0	yes
9	1
10	0	yes
11	1
12	0	yes
13	1
14	0	yes
15	1
16	0	yes

The code again

for number in range(1, 17):
    if number % 2 == 0:
        print(number)