Issue 2235: __hash__ is once again inherited by default, but inheritance can be blocked explicitly so that collections.Hashable remains meaningful

1 files changed, 2 insertions, 4 deletions

diff --git a/Lib/sets.py b/Lib/sets.py
index 99ee931d9b..b1743da844 100644
--- a/Lib/sets.py
+++ b/Lib/sets.py
@@ -439,10 +439,8 @@ class Set(BaseSet):
     def __setstate__(self, data):
         self._data, = data
 
-    def __hash__(self):
-        """A Set cannot be hashed."""
-        # We inherit object.__hash__, so we must deny this explicitly
-        raise TypeError, "Can't hash a Set, only an ImmutableSet."
+    # We inherit object.__hash__, so we must deny this explicitly
+    __hash__ = None
 
     # In-place union, intersection, differences.
     # Subtle:  The xyz_update() functions deliberately return None,