Improve deleted Animation warning

timhoffm · timhoffm · commit 166fdf2652ce · 2021-08-27T00:16:46.000+02:00
Closes #20909.
diff --git a/lib/matplotlib/animation.py b/lib/matplotlib/animation.py
@@ -888,9 +888,9 @@ def __del__(self):
         if not getattr(self, '_draw_was_started', True):
             warnings.warn(
                 'Animation was deleted without rendering anything. This is '
-                'most likely unintended. To prevent deletion, assign the '
-                'Animation to a variable that exists for as long as you need '
-                'the Animation.')
+                'most likely not intended. To prevent deletion, assign the '
+                'Animation to a variable `anim` that exists until you have '
+                'outputted the Animation using `plt.show()` or `anim.save()`.')
 
     def _start(self, *args):
         """
