Do not store cached hash value when pickling

corenting · Dec 6, 2023 · 9ac0e87 · 9ac0e87
1 parent c9504d0
commit 9ac0e87
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/immutabledict/__init__.py b/immutabledict/__init__.py
@@ -45,6 +45,11 @@ def __new__(cls, *args: Any, **kwargs: Any) -> immutabledict[_K, _V]:  # noqa: D
         setattr(inst, "_hash", None)
         return inst
 
+    def __reduce__(self) ->Tuple[Any, ...]:
+        # Do not stored the cached hash value when pickling
+        # as the value might change across Python invocations.
+        return (self.__class__, (self._dict,))
+
     def __getitem__(self, key: _K) -> _V:
         return self._dict[key]