Setting package archives

[pauline-galea]

How can I set package-archives in emacs

I am using the following

(defun gungadin-locate-archives ()
  "Installs package archives."
  (require 'package)
  (add-to-list 'package-archives
     '( ("gnu" . "https://elpa.gnu.org/packages/";)
        ("melpa-stable" . "https://melpa.org/packages/";)
        ("org" . "https://orgmode.org/elpa/";)) )
   (package-initialize) )