Answer: Python Puzzler #935

The answer is B. The program prints:

[12, 13, 14]

Why?

append adds one item to the end of the list each time round the loop. The loop runs for n = 2, 3, 4.

Trace table

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

n	n + 10	results so far
2	12	[12]
3	13	[12, 13]
4	14	[12, 13, 14]

The code again

results = []
for n in range(2, 5):
    results.append(n + 10)
print(results)