Pass method in __finalize__

pandas/core/base.py

@@ -1521,4 +1521,4 @@ def duplicated(self, keep="first"):
         else:
             return self._constructor(
                 duplicated(self, keep=keep), index=self.index
-            ).__finalize__(self)
+            ).__finalize__(self, method="duplicated")

pandas/core/frame.py

@@ -2515,7 +2515,7 @@ def transpose(self, *args, copy: bool = False) -> "DataFrame":
                 new_values, index=self.columns, columns=self.index
             )
 
-        return result.__finalize__(self)
+        return result.__finalize__(self, method="transpose")
 
     @property
     def T(self) -> "DataFrame":
@@ -4470,7 +4470,7 @@ def _maybe_casted_values(index, labels=None):
     @Appender(_shared_docs["isna"] % _shared_doc_kwargs)
     def isna(self) -> "DataFrame":
         result = self._constructor(self._data.isna(func=isna))
-        return result.__finalize__(self)
+        return result.__finalize__(self, method="isna")
 
     @Appender(_shared_docs["isna"] % _shared_doc_kwargs)
     def isnull(self) -> "DataFrame":
@@ -4798,7 +4798,7 @@ def sort_values(
         if inplace:
             return self._update_inplace(result)
         else:
-            return result.__finalize__(self)
+            return result.__finalize__(self, method="sort_values")
 
     def sort_index(
         self,
@@ -4934,7 +4934,7 @@ def sort_index(
         if inplace:
             return self._update_inplace(result)
         else:
-            return result.__finalize__(self)
+            return result.__finalize__(self, method="sort_index")
 
     def value_counts(
         self,

pandas/core/generic.py

@@ -590,7 +590,9 @@ def swapaxes(self: FrameOrSeries, axis1, axis2, copy=True) -> FrameOrSeries:
         if copy:
             new_values = new_values.copy()
 
-        return self._constructor(new_values, *new_axes).__finalize__(self)
+        return self._constructor(new_values, *new_axes).__finalize__(
+            self, method="swapaxes"
+        )
 
     def droplevel(self: FrameOrSeries, level, axis=0) -> FrameOrSeries:
         """
@@ -993,7 +995,7 @@ def rename(
             self._update_inplace(result)
             return None
         else:
-            return result.__finalize__(self)
+            return result.__finalize__(self, method="rename")
 
     @rewrite_axis_style_signature("mapper", [("copy", True), ("inplace", False)])
     def rename_axis(self, mapper=lib.no_default, **kwargs):
@@ -1357,7 +1359,7 @@ def __invert__(self):
             return self
 
         new_data = self._mgr.apply(operator.invert)
-        result = self._constructor(new_data).__finalize__(self)
+        result = self._constructor(new_data).__finalize__(self, method="__invert__")
         return result
 
     def __nonzero__(self):
@@ -1802,7 +1804,9 @@ def __array_wrap__(self, result, context=None):
             # ptp also requires the item_from_zerodim
             return result
         d = self._construct_axes_dict(self._AXIS_ORDERS, copy=False)
-        return self._constructor(result, **d).__finalize__(self)
+        return self._constructor(result, **d).__finalize__(
+            self, method="__array_wrap__"
+        )
 
     # ideally we would define this to avoid the getattr checks, but
     # is slower
@@ -3361,7 +3365,7 @@ class  max_speed
         new_data = self._mgr.take(
             indices, axis=self._get_block_manager_axis(axis), verify=True
         )
-        return self._constructor(new_data).__finalize__(self)
+        return self._constructor(new_data).__finalize__(self, method="take")
 
     def _take_with_is_copy(self: FrameOrSeries, indices, axis=0) -> FrameOrSeries:
         """
@@ -4430,7 +4434,7 @@ def reindex(self: FrameOrSeries, *args, **kwargs) -> FrameOrSeries:
         # perform the reindex on the axes
         return self._reindex_axes(
             axes, level, limit, tolerance, method, fill_value, copy
-        ).__finalize__(self)
+        ).__finalize__(self, method="reindex")
 
     def _reindex_axes(
         self: FrameOrSeries, axes, level, limit, tolerance, method, fill_value, copy
@@ -5129,7 +5133,7 @@ def pipe(self, func, *args, **kwargs):
     # Attribute access
 
     def __finalize__(
-        self: FrameOrSeries, other, method=None, **kwargs
+        self: FrameOrSeries, other, method: Optional[str] = None, **kwargs
     ) -> FrameOrSeries:
         """
         Propagate metadata from other to self.
@@ -5138,9 +5142,14 @@ def __finalize__(
         ----------
         other : the object from which to get the attributes that we are going
             to propagate
-        method : optional, a passed method name ; possibly to take different
-            types of propagation actions based on this
+        method : str, optional
+            A passed method name providing context on where ``__finalize__``
+            was called.
+
+            .. warning:
 
+               The value passed as `method` are not currently considered
+               stable across pandas releases.
         """
         if isinstance(other, NDFrame):
             for name in other.attrs:
@@ -5293,10 +5302,10 @@ def _check_inplace_setting(self, value) -> bool_t:
         return True
 
     def _get_numeric_data(self):
-        return self._constructor(self._mgr.get_numeric_data()).__finalize__(self)
+        return self._constructor(self._mgr.get_numeric_data()).__finalize__(self,)
 
     def _get_bool_data(self):
-        return self._constructor(self._mgr.get_bool_data()).__finalize__(self)
+        return self._constructor(self._mgr.get_bool_data()).__finalize__(self,)
 
     # ----------------------------------------------------------------------
     # Internal Interface Methods
@@ -5562,8 +5571,8 @@ def astype(
 
         else:
             # else, only a single dtype is given
-            new_data = self._mgr.astype(dtype=dtype, copy=copy, errors=errors)
-            return self._constructor(new_data).__finalize__(self)
+            new_data = self._mgr.astype(dtype=dtype, copy=copy, errors=errors,)
+            return self._constructor(new_data).__finalize__(self, method="astype")
 
         # GH 19920: retain column metadata after concat
         result = pd.concat(results, axis=1, copy=False)
@@ -5677,7 +5686,7 @@ def copy(self: FrameOrSeries, deep: bool_t = True) -> FrameOrSeries:
         """
         data = self._mgr.copy(deep=deep)
         self._clear_item_cache()
-        return self._constructor(data).__finalize__(self)
+        return self._constructor(data).__finalize__(self, method="copy")
 
     def __copy__(self: FrameOrSeries, deep: bool_t = True) -> FrameOrSeries:
         return self.copy(deep=deep)
@@ -5783,7 +5792,7 @@ def infer_objects(self: FrameOrSeries) -> FrameOrSeries:
             self._mgr.convert(
                 datetime=True, numeric=False, timedelta=True, coerce=False, copy=True
             )
-        ).__finalize__(self)
+        ).__finalize__(self, method="infer_objects")
 
     def convert_dtypes(
         self: FrameOrSeries,
@@ -6110,7 +6119,7 @@ def fillna(
         if inplace:
             return self._update_inplace(result)
         else:
-            return result.__finalize__(self)
+            return result.__finalize__(self, method="fillna")
 
     def ffill(
         self: FrameOrSeries,
@@ -6626,7 +6635,7 @@ def replace(
         if inplace:
             return self._update_inplace(result)
         else:
-            return result.__finalize__(self)
+            return result.__finalize__(self, method="replace")
 
     _shared_docs[
         "interpolate"
@@ -6892,7 +6901,7 @@ def interpolate(
         if inplace:
             return self._update_inplace(result)
         else:
-            return result.__finalize__(self)
+            return result.__finalize__(self, method="interpolate")
 
     # ----------------------------------------------------------------------
     # Timeseries methods Methods
@@ -7130,11 +7139,11 @@ def asof(self, where, subset=None):
 
     @Appender(_shared_docs["isna"] % _shared_doc_kwargs)
     def isna(self: FrameOrSeries) -> FrameOrSeries:
-        return isna(self).__finalize__(self)
+        return isna(self).__finalize__(self, method="isna")
 
     @Appender(_shared_docs["isna"] % _shared_doc_kwargs)
     def isnull(self: FrameOrSeries) -> FrameOrSeries:
-        return isna(self).__finalize__(self)
+        return isna(self).__finalize__(self, method="isnull")
 
     _shared_docs[
         "notna"
@@ -7200,11 +7209,11 @@ def isnull(self: FrameOrSeries) -> FrameOrSeries:
 
     @Appender(_shared_docs["notna"] % _shared_doc_kwargs)
     def notna(self: FrameOrSeries) -> FrameOrSeries:
-        return notna(self).__finalize__(self)
+        return notna(self).__finalize__(self, method="notna")
 
     @Appender(_shared_docs["notna"] % _shared_doc_kwargs)
     def notnull(self: FrameOrSeries) -> FrameOrSeries:
-        return notna(self).__finalize__(self)
+        return notna(self).__finalize__(self, method="notnull")
 
     def _clip_with_scalar(self, lower, upper, inplace: bool_t = False):
         if (lower is not None and np.any(isna(lower))) or (
@@ -8228,7 +8237,7 @@ def ranker(data):
                 pct=pct,
             )
             ranks = self._constructor(ranks, **data._construct_axes_dict())
-            return ranks.__finalize__(self)
+            return ranks.__finalize__(self, method="rank")
 
         # if numeric_only is None, and we can't get anything, we try with
         # numeric_only=True
@@ -8435,7 +8444,10 @@ def _align_frame(
                     left.index = join_index
                     right.index = join_index
 
-        return left.__finalize__(self), right.__finalize__(other)
+        return (
+            left.__finalize__(self),
+            right.__finalize__(other),
+        )
 
     def _align_series(
         self,
@@ -8519,7 +8531,10 @@ def _align_series(
                         left.index = join_index
                         right.index = join_index
 
-        return left.__finalize__(self), right.__finalize__(other)
+        return (
+            left.__finalize__(self),
+            right.__finalize__(other),
+        )
 
     def _where(
         self,
@@ -8932,7 +8947,7 @@ def shift(
         else:
             return self.tshift(periods, freq)
 
-        return self._constructor(new_data).__finalize__(self)
+        return self._constructor(new_data).__finalize__(self, method="shift")
 
     def slice_shift(self: FrameOrSeries, periods: int = 1, axis=0) -> FrameOrSeries:
         """
@@ -8969,7 +8984,7 @@ def slice_shift(self: FrameOrSeries, periods: int = 1, axis=0) -> FrameOrSeries:
         shifted_axis = self._get_axis(axis)[islicer]
         new_obj.set_axis(shifted_axis, axis=axis, inplace=True)
 
-        return new_obj.__finalize__(self)
+        return new_obj.__finalize__(self, method="slice_shift")
 
     def tshift(
         self: FrameOrSeries, periods: int = 1, freq=None, axis: Axis = 0
@@ -9029,7 +9044,7 @@ def tshift(
 
         result = self.copy()
         result.set_axis(new_ax, axis, inplace=True)
-        return result.__finalize__(self)
+        return result.__finalize__(self, method="tshift")
 
     def truncate(
         self: FrameOrSeries, before=None, after=None, axis=None, copy: bool_t = True
@@ -9240,7 +9255,7 @@ def _tz_convert(ax, tz):
 
         result = self.copy(deep=copy)
         result = result.set_axis(ax, axis=axis, inplace=False)
-        return result.__finalize__(self)
+        return result.__finalize__(self, method="tz_convert")
 
     def tz_localize(
         self: FrameOrSeries,
@@ -9409,7 +9424,7 @@ def _tz_localize(ax, tz, ambiguous, nonexistent):
 
         result = self.copy(deep=copy)
         result = result.set_axis(ax, axis=axis, inplace=False)
-        return result.__finalize__(self)
+        return result.__finalize__(self, method="tz_localize")
 
     # ----------------------------------------------------------------------
     # Numeric Methods
@@ -11188,7 +11203,7 @@ def block_accum_func(blk_values):
 
         d = self._construct_axes_dict()
         d["copy"] = False
-        return self._constructor(result, **d).__finalize__(self)
+        return self._constructor(result, **d).__finalize__(self, method=name)
 
     return set_function_name(cum_func, name, cls)