A list comprehension is easiest here: >>> n = 5 >>> lists = [[] for _ in range(n)] >>> lists [[], [], [], [], []] Be wary not to fall into the trap that is: >>> lists = [[]] * 5 >>> lists [[], [], [], [], []] >>> lists[0].append(1) >>> lists [[1], [1], [1], … Read more
You should use null. In most cases it doesn’t matter, but it is a good habit to get into anyway, because occasionally you may want to check if a list of non-comparable things is empty. Here is a short, crisp example showing this difference: > null [id] False > [id] == [] <interactive>:1:1: error: • … Read more
You are looking for Enumerable.Empty<T>(). In other news the Java empty list sucks because the List interface exposes methods for adding elements to the list which throw exceptions.
The main difference is that Collections.emptyList() returns an immutable list, i.e., a list to which you cannot add elements. (Same applies to the List.of() introduced in Java 9.) In the rare cases where you do want to modify the returned list, Collections.emptyList() and List.of() are thus not a good choices. I’d say that returning an … Read more