diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
index 02a12307a..40b9c4cf3 100644
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -4000,6 +4000,15 @@ def __len__(self):
         # This is only useful for tests
         return len(self.getslice())
 
+    def getslice(self, start, end):
+        raise NotImplementedError('This method must be implemented by subclasses')
+
+    def __getitem__(self, idx):
+        if not isinstance(idx, int) or idx < 0:
+            raise TypeError('indices must be non-negative integers')
+        entries = self.getslice(idx, idx + 1)
+        return entries[0] if entries else None
+
 
 class OnDemandPagedList(PagedList):
     def __init__(self, pagefunc, pagesize, use_cache=True):