Hollow triangle-drawing characters param error.

[ThomasL]

for rows in range(1, 10):
    if rows > 2:
        print('@')
        for i in range(rows-2):
            print(f'@{i*" "}@')
        print('@'*rows)
    else:
        for i in range(1, rows+1):
            print('@'*i)
    print()