List of cigarettes by strength. Try it yourself with timeit. When you start dealing with Factory classes, it is critical to deal with contracts rather than specific implementations. The Java syntax for that is to put <T> in front of the function. You can get the unique values by converting the list to a set. timeit () or preferably timeit. Since the code in test works for any kind of object in the list, this works as a formal method parameter. Using generics is pretty easy (most of the time). This is exactly analogous to declaring formal parameter 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. . Factories produce objects of various types at runtime. 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 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. Also, don't use list as a name since it shadows the built-in. For example, if passed the following: a = [] How do I check to see if a is empty? I have a piece of code here that is supposed to return the least common element in a list of elements, ordered by commonality: def getSingle(arr): from collections import Counter c = Counte Nov 1, 2011 · How can I check if a list has any duplicates and return a new list without duplicates? I would like to index a list with another list like this Oct 15, 2012 · 1541 First declare your list properly, separated by commas. Using a type parameter (like in your point 3), requires that the type parameter be declared. The notation List<?> means "a list of something (but I'm not saying what)". Other than that I think the only difference is speed: it looks like it's a little faster the first way. The second, list(), is using the actual list type constructor to create a new list which has contents equal to the first list. repeat (). Jan 29, 2009 · List<String> L = new ArrayList<String>(); You should read that as "L is a kind of List that deals with String objects". When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in the list. Nov 2, 2010 · When reading, list is a reference to the original list, and list[:] shallow-copies the list. nem cge kfp lmv mki xhl uiw bwk yta glt qiw kyw gma xsw xtj