Can anyone explain the output?

Question

The below code prints a = [20, 20], can anyone please explain why so.
Code:
a = [i // 2 for i in range(0,50) if i // 2 == 20]
print(a)

I thought the answer would be 20 and the length of a would be 1 for i = 40, not sure where the another 20 came from

Answer 1

# Try to output i as well:
a = [(i, i // 2) for i in range(0,50) if i // 2 == 20]
print(a)

Answer 2

Thanks for your suggestion Lisa .
I tried and got (40, 20), (41,20) as output. Since it's floor division 41//2 results in 20 as well. Thanks