use __finalize__ for attrs bin ops in series.py

pandas/core/series.py

@@ -5862,7 +5862,7 @@ def _cmp_method(self, other, op):
         res_name = ops.get_op_result_name(self, other)
 
         if not getattr(self, "attrs", None) and getattr(other, "attrs", None):
-            self.attrs = other.attrs
+            self.__finalize__(other)
 
         if isinstance(other, Series) and not self._indexed_same(other):
             raise ValueError("Can only compare identically-labeled Series objects")
@@ -5948,7 +5948,7 @@ def _binop(self, other: Series, func, level=None, fill_value=None) -> Series:
         name = ops.get_op_result_name(self, other)
 
         if not getattr(this, "attrs", None) and getattr(other, "attrs", None):
-            this.attrs = other.attrs
+            this.__finalize__(other)
 
         out = this._construct_result(result, name)
         return cast(Series, out)