Python class 10

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17        Array usually need elements to be in the same type. List doesn't need
        List is like a warehouse, can have all types including objects,eg a list in a list
        List=[1,2,3,4,5]
        List=[1,2,3,4,["a",'d']]
18        can create an empty list
        a=[], empty list
19        Add elements into list
        Append()
        member=[1,23,4,5]
        member.append('hulu')- hulu will be append at the end of the list
        append is a "method" that applies to list-member, i.e.object/list
        append can only add one element each time
        Extend(),
        also one element as argument
        extend is to use one list to extend the target list.
        member.extend([12,23,543])
        will extend it to original list. New list members will be at the end of list
        Insert
        member.insert(1,'fish')
        it can add new elements at the position.