Fix binary operators on attrs for Series and DataFrame

Author: fbourgey

pandas/core/base.py

@@ -1466,6 +1466,9 @@ def _arith_method(self, other, op):
         with np.errstate(all="ignore"):
             result = ops.arithmetic_op(lvalues, rvalues, op)
 
+        if not self.attrs and other.attrs:
+            self.attrs = other.attrs
+
         return self._construct_result(result, name=res_name)
 
     def _construct_result(self, result, name):

pandas/core/frame.py

@@ -7830,6 +7830,10 @@ def _arith_method(self, other, op):
 
         with np.errstate(all="ignore"):
             new_data = self._dispatch_frame_op(other, op, axis=axis)
+
+        if not self.attrs and other.attrs:
+            self.attrs = other.attrs
+
         return self._construct_result(new_data)
 
     _logical_method = _arith_method
@@ -8185,6 +8189,9 @@ def _flex_arith_method(
 
                 new_data = self._dispatch_frame_op(other, op)
 
+        if not self.attrs and other.attrs:
+            self.attrs = other.attrs
+
         return self._construct_result(new_data)
 
     def _construct_result(self, result) -> DataFrame:

pandas/core/series.py

@@ -5916,6 +5916,10 @@ def _binop(self, other: Series, func, level=None, fill_value=None) -> Series:
             result = func(this_vals, other_vals)
 
         name = ops.get_op_result_name(self, other)
+
+        if not this.attrs and other.attrs:
+            this.attrs = other.attrs
+
         out = this._construct_result(result, name)
         return cast(Series, out)