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 of the list. Nov 2, 2010 · When reading, list is a reference to the original list, and list[:] shallow-copies the list.
Understanding the Context
When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in 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. Jan 27, 2012 · list[a:b:c], a is the starting index, b is the ending index and c is the optional step size. This will give you a list starting at index a (inclusive) and ending at index b (exclusive) picking elements at.
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Key Insights
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.
Final Thoughts
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. 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. 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. Jul 19, 2014 · You can access the elements in a list-of-lists by first specifying which list you're interested in and then specifying which element of that list you want.
For example, 17 is element 2 in list 0,. Aug 2, 2013 · List<Integer> 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.
