code: def get_global_images(self):
          
          data = self.get_images()
          images = list()
          for i in data:
              if i.public:
                  i.token = self.token
                  images.append(i)
          return images
docs: This function returns a list of Image objects representing
              public DigitalOcean images (e.g. base distribution images
              and 'One-Click' applications).