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Oct 5, 2012 · By using a : colon in the list index, you are asking for a slice, which is always another list. In Python you can assign values to both an individual item in a list, and to a slice. 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 =. 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 second, list(), is using the. Nov 2, 2010 · When reading, list is a reference to the original list, and list[:] shallow-copies the list. When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously. 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. Other than that I think the only difference is speed: it looks.
Sep 9, 2019 · Note that the question was about pandas tolist vs to_list. pandas.DataFrame.values returns a numpy array and numpy indeed has only tolist. Indeed, if you read the discussion. Mar 20, 2013 · It gets all the elements from the list (or characters from a string) but the last element. : represents going through the list -1 implies the last element of the list 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.
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