Add compatibility handler for accessing EntryPoints by index. Fixes #300.

Author: jaraco

importlib_metadata/__init__.py

@@ -220,6 +220,14 @@ def __getitem__(self, name):  # -> EntryPoint:
         """
         Get the EntryPoint in self matching name.
         """
+        if isinstance(name, int):
+            warnings.warn(
+                "Accessing entry points by index is deprecated. "
+                "Cast to tuple if needed.",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+            return super().__getitem__(name)
         try:
             return next(iter(self.select(name=name)))
         except StopIteration: