verify before make changes?

def delete_item(request, item_id):
item = get_object_or_404(Item, pk=item_id)
return render(request, 'delete_item.html', {'item':item, 'item_id':item_id},)

def delete_confirmed(request, item_id):
query = get_object_or_404(Item, pk=item_id)
query.delete()
return render(request, 'delete_success.html', {'query':query},)

I came up with these functions that delete an object from the db after a user confirmation. However, these do not check if the object actually exist and or already deleted.

How do I make these functions to verify before making any hits or changes to db?

Likewise, I will derive the understanding from it and apply to my save function, in order that I might avoid duplication of items in my db.

I'm using modelforms for the save form though

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