List of funerals at reading crematorium, Nov 2, 2010 · When reading, list is a reference to the original list, and list[:] shallow-copies the list. 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 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)". Using a type parameter (like in your point 3), requires that the type parameter be declared. When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in the list. # Here we use readlines() to split the file into a list where each element is a line for line in f. The second, list(), is using the actual list type constructor to create a new list which has contents equal to the first list. The most popular solutions here generally only flatten one "level" of the nested list. The Java syntax for that is to put <T> in front of the function. Try it yourself with timeit. In Python you can assign values to both an individual item in a list, and to a slice of the list. timeit () or preferably timeit. readlines(): # Now we split the file on `x`, since the part before the x will be # the key and the part after the value If your list of lists comes from a nested list comprehension, the problem can be solved more simply/directly by fixing the comprehension; please see How can I get a flat result from a list comprehension instead of a nested list?. See Flatten an irregular (arbitrarily nested) list of lists for solutions that . Also, don't use list as a name since it shadows the built-in. Oct 5, 2012 · By using a : colon in the list index, you are asking for a slice, which is always another list. : represents going through the list -1 implies the last element of the list Official Google Search Help Center where you can find tips and tutorials on using Google Search and other answers to frequently asked questions. Other than that I think the only difference is speed: it looks like it's a little faster the first way. repeat (). See Flatten an irregular (arbitrarily nested) list of lists for solutions that Oct 5, 2012 · By using a : colon in the list index, you are asking for a slice, which is always another list. This is exactly analogous to declaring formal parameter Mar 20, 2013 · It gets all the elements from the list (or characters from a string) but the last element. 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. Since the code in test works for any kind of object in the list, this works as a formal method parameter.
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