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 …

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 in the list. …

Oct 31, 2008 · What is the difference between the list methods append and extend? .append() adds its argument as a single element to the end of a list. The length of the list itself will increase by one. …

Editor's notes: 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 …

Create a dropdown list on cells with existing data In Google Sheets, open a spreadsheet. Select the cell or cells with existing data. Right-click Dropdown. If a selected cell includes an existing dropdown, …

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?

4154 new_list = my_list doesn't actually create a second list. The assignment just copies the reference to the list, not the actual list, so both new_list and my_list refer to the same list after the assignment. …

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 …

Apr 11, 2011 · How can I convert a list to a string using Python?