Answer: Python Puzzler #745

The answer is A. The program prints:

30

Why?

range(0, 13, 3) starts at 0, goes up in steps of 3, and stops before 13. So the loop adds 0 + 3 + 6 + 9 + 12. The total is 30.

Trace table

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

number	total after the loop body
0	0
3	3
6	9
9	18
12	30

The code again

total = 0
for number in range(0, 13, 3):
    total = total + number
print(total)