abs(int(position)) ??

This video is FLYING through things without explaining in depth... why are we choosing the spots for clearing the screen that we are? Why is it better to show_list() at top of add_to_list rather than bottom where it was? Why introduce an inferior concept (and mention this), without explaining why, or at least hinting at what the better solution is?

This less-good solution of putting the index instantly introduces some complex differences and leads straight into

def add_to_list(item):
    show_list()
    if len(shopping_list):
        position = input("Where should I add {}?\n"
                         "press ENTER to add to end of list\n"
                         "> ".format(item))
    else:
        position = 0
    try:
        position = abs(int(position))
    except ValueError:
        position = None
    if position is not None:
        shopping_list.insert(position-1, item)


    else:
        shopping_list.append(new_item)


    shopping_list.append(new_item)

I was quite frustrated at the 'follow along quickly and think later' approach but this sort of threw me into a wall.

So much has happened here with little explanation, so different than we have done before, why not introduce concepts one at a time? What on earth are we doing here and why? Especially the 'try: position = abs(int(position)) , what is abs and why is it expecting a value error ?

this is quite complex and also apparently not the best way to do it.. way too much being thrown at us with too little explanation... can someone please explain whats going on here?

Also 'I think i am going to get rid of this, too, deletes line' is not helpful, please explain why... this is the first time I had to shut down a video from frustration. I am sure I am not the only one.