Moreover, these kumites only introduce bad spacing practices in writing Python code.

you are not creating anything new or original

Thanks! I have modified it to work, assuming all objects in the list implement str. Initially I used the none to handle the edge case of the last element (since we want to compare an element to both its neighbours) but now I am just abusing negative indices to handle it.

This won't work for lists with values of different data types. And the addition of None makes no sense.