Replace the use of deprecated / optional attributes

* Use getattr for is_animated attribute per the pillow doc

* Use getattr for the n_frames attribute as well

arcade/sprite/__init__.py

@@ -37,12 +37,18 @@ def load_animated_gif(resource_name) -> TextureAnimationSprite:
 
     file_name = resolve(resource_name)
     image_object = PIL.Image.open(file_name)
-    if not image_object.is_animated:
+
+    # Pillow doc recommends testing for the is_animated attribute as of 10.0.0
+    # https://pillow.readthedocs.io/en/stable/deprecations.html#categories
+    if (
+        not getattr(image_object, "is_animated", False)
+        or not (n_frames := getattr(image_object, "n_frames", 0))
+    ):
         raise TypeError(f"The file {resource_name} is not an animated gif.")
 
     sprite = TextureAnimationSprite()
     keyframes = []
-    for frame in range(image_object.n_frames):
+    for frame in range(n_frames):
         image_object.seek(frame)
         frame_duration = image_object.info["duration"]
         image = image_object.convert("RGBA")

arcade/texture_atlas/atlas_default.py

@@ -13,6 +13,7 @@
 from weakref import WeakSet, WeakValueDictionary, finalize
 
 import PIL.Image
+from PIL.Image import Resampling
 from PIL import Image, ImageDraw
 from pyglet.image.atlas import (
     Allocator,
@@ -504,10 +505,10 @@ def write_image(self, image: PIL.Image.Image, x: int, y: int) -> None:
 
             # Resize the strips to the border size if larger than 1
             if self._border > 1:
-                strip_top = strip_top.resize((image.width, self._border), Image.NEAREST)
-                strip_bottom = strip_bottom.resize((image.width, self._border), Image.NEAREST)
-                strip_left = strip_left.resize((self._border, image.height), Image.NEAREST)
-                strip_right = strip_right.resize((self._border, image.height), Image.NEAREST)
+                strip_top = strip_top.resize((image.width, self._border), Resampling.NEAREST)
+                strip_bottom = strip_bottom.resize((image.width, self._border), Resampling.NEAREST)
+                strip_left = strip_left.resize((self._border, image.height), Resampling.NEAREST)
+                strip_right = strip_right.resize((self._border, image.height), Resampling.NEAREST)
 
             tmp.paste(strip_top, (self._border, 0))
             tmp.paste(strip_bottom, (self._border, tmp.height - self._border))