Meaning of list[-1] in Python - Stack Overflow
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 = …
python - Access item in a list of lists - Stack Overflow
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 …
How to initialize List<String> object in Java? - Stack Overflow
Nov 15, 2012 · List is an Interface, you cannot instantiate an Interface, because interface is a convention, what methods should have your classes. In order to instantiate, you need some …
collect_list by preserving order based on another variable
Oct 5, 2017 · But collect_list doesn't guarantee order even if I sort the input data frame by date before aggregation. Could someone help on how to do aggregation by preserving the order …
How to cast List<Object> to List<MyClass> - Stack Overflow
Nov 29, 2016 · (List<Customer>)(Object)list; you must be sure that at runtime the list contains nothing but Customer objects. Critics say that such casting indicates something wrong with …
Java Generics: List, List<Object>, List<?> - Stack Overflow
Jan 29, 2009 · List<String> L = new ArrayList<String>(); You should read that as "L is a kind of List that deals with String objects". When you start dealing with Factory classes, it is critical to …
How can I find the index for a given item in a list?
Caveats Linear time-complexity in list length An index call checks every element of the list in order, until it finds a match. If the list is long, and if there is no guarantee that the value will be …
Python list vs. array – when to use? - Stack Overflow
The list is the part of python's syntax so it doesn't need to be declared whereas you have to declare the array before using it. You can store values of different data-types in a list …
Sum a list of numbers in Python - Stack Overflow
Depending on how big your list is, several orders of magnitude faster. Also, it's a lot less code, and at least to me, it's easier to read. I'm trying to make a habit out of using numpy for all …
c# - define a List like List<int,string>? - Stack Overflow
I need a two column list like: List<int,string> mylist= new List<int,string> (); it says using the generic type System.collection.generic.List<T> requires 1 type arguments.