Add return type for __enter__

sebastinas · sebastinas · commit 3c9e35dc6c38 · 2021-12-08T22:54:12.000+01:00
diff --git a/bpython/inspection.py b/bpython/inspection.py
@@ -58,7 +58,7 @@ class AttrCleaner:
     def __init__(self, obj: Any) -> None:
         self.obj = obj
 
-    def __enter__(self):
+    def __enter__(self) -> None:
         """Try to make an object not exhibit side-effects on attribute
         lookup."""
         type_ = type(self.obj)
