The first, [:], is creating a slice (normally often used for getting just part of a list), which happens to contain the entire list, and thus is effectively a copy of the list. The notation List<?> means "a list of something (but I'm not saying what)". The second, list(), is using the actual list type constructor to create a new list which has contents equal to the first list. Other than that I think the only difference is speed: it looks like it's a little faster the first way. Point to the item you want to move. Drag the item where you want. Jan 27, 2012 · list[a:b:c], a is the starting index, b is the ending index and c is the optional step size. The first way works for a list or a string; the second way only works for a list, because slice assignment isn't allowed for strings. This is exactly analogous to declaring formal parameter Feb 25, 2015 · A list of lists would essentially represent a tree structure, where each branch would constitute the same type as its parent, and its leaf nodes would represent values. Also, don't use list as a name since it shadows the built-in.

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