Add __hash__ to paramspec

python · JelleZijlstra · Apr 10, 2021 · Jan 2, 2021 · Jan 2, 2021 · Jan 3, 2021
commit 149d3c77d52ec73f04b3cd59cb2c0584c679ce28
diff --git a/typing_extensions/src_py3/test_typing_extensions.py b/typing_extensions/src_py3/test_typing_extensions.py
@@ -1881,6 +1881,8 @@ def test_basic_plain(self):
         P = ParamSpec('P')
         self.assertEqual(P, P)
         self.assertIsInstance(P, ParamSpec)
+        # Should be hashable
+        hash(P)
 
     def test_repr(self):
         P = ParamSpec('P')

diff --git a/typing_extensions/src_py3/typing_extensions.py b/typing_extensions/src_py3/typing_extensions.py
@@ -2252,6 +2252,12 @@ def __repr__(self):
                 prefix = '~'
             return prefix + self.__name__
 
+        def __hash__(self):
+            return hash((self.__name__,
+                         self.__covariant__,
+                         self.__contravariant__,
+                         self.__bound__))
+
         def __reduce__(self):
             return self.__name__