Answer: Python Puzzler #1995

The answer is C. The program prints:

1
2
3
Zap
5
6

Why?

Every number that divides exactly by 4 (remainder 0) is replaced by ‘Zap’. All the others are printed as they are.

Trace table

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

number	number % 4	printed
1	1	1
2	2	2
3	3	3
4	0	Zap
5	1	5
6	2	6

The code again

for number in range(1, 7):
    if number % 4 == 0:
        print("Zap")
    else:
        print(number)