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 actual. 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. The notation List means "a list of something (but I'm not saying what)". Since the code in test works for any kind of object in the list, this works as a formal method parameter. Using a type parameter.

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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 like it's a little. 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. Oct 5, 2012ย ยท 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 of the list. Nov 2, 2010ย ยท 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 in the list.. Aug 2, 2013ย ยท List might lead to devastating memory fragmentation. Java maintains constant pool for some integers in 0..128 range but generally Java allocates a new object for each 32-bit. Reorder list items On your computer, go to Google Keep. Choose a list. Point to the item you want to move. At the left, click and hold Move . Drag the item where you want.

Aug 2, 2013ย ยท List might lead to devastating memory fragmentation. Java maintains constant pool for some integers in 0..128 range but generally Java allocates a new object for each 32-bit. Reorder list items On your computer, go to Google Keep. Choose a list. Point to the item you want to move. At the left, click and hold Move . Drag the item where you want.

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