If we mark the first three lines, starting from def one, in visual mode, and execute the :Linediff command, the signs 1- will be placed at the start and at the end of the visual mode's range. Doing the same thing on the bottom half of the code, starting from def two, will result in the signs 2- placed there. After that, a new tab will be opened with the two blocks of code in vertical splits, diffe