Python Fastest way to find Indexes of item in list

Question

If one was to attempt to find the indexes of an item in a list you could do it a couple different ways here is what I know to be the fastest

aList = [123, \'         


        

Answer 1

Simply create a dictionary of item->index from the list of items using zip like so:

items_as_dict = dict(zip(list_of_items,range(0,len(list_of_items))))
index = items_as_dict(item)