CLN: Remove Series.view/ravel, fastpath (#57319)

Author: mroeschke

doc/redirects.csv

@@ -1114,7 +1114,6 @@ generated/pandas.Series.ptp,../reference/api/pandas.Series.ptp
 generated/pandas.Series.quantile,../reference/api/pandas.Series.quantile
 generated/pandas.Series.radd,../reference/api/pandas.Series.radd
 generated/pandas.Series.rank,../reference/api/pandas.Series.rank
-generated/pandas.Series.ravel,../reference/api/pandas.Series.ravel
 generated/pandas.Series.rdiv,../reference/api/pandas.Series.rdiv
 generated/pandas.Series.rdivmod,../reference/api/pandas.Series.rdivmod
 generated/pandas.Series.real,../reference/api/pandas.Series.real
@@ -1249,7 +1248,6 @@ generated/pandas.Series.valid,../reference/api/pandas.Series.valid
 generated/pandas.Series.value_counts,../reference/api/pandas.Series.value_counts
 generated/pandas.Series.values,../reference/api/pandas.Series.values
 generated/pandas.Series.var,../reference/api/pandas.Series.var
-generated/pandas.Series.view,../reference/api/pandas.Series.view
 generated/pandas.Series.where,../reference/api/pandas.Series.where
 generated/pandas.Series.xs,../reference/api/pandas.Series.xs
 generated/pandas.set_option,../reference/api/pandas.set_option

doc/source/reference/series.rst

@@ -236,10 +236,8 @@ Reshaping, sorting
    Series.unstack
    Series.explode
    Series.searchsorted
-   Series.ravel
    Series.repeat
    Series.squeeze
-   Series.view
 
 Combining / comparing / joining / merging
 -----------------------------------------

doc/source/whatsnew/v3.0.0.rst

@@ -104,14 +104,18 @@ Deprecations
 Removal of prior version deprecations/changes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 - All arguments except the first ``path``-like argument in IO writers are now keyword only (:issue:`54229`)
+- Removed ``DataFrame.first`` and ``DataFrame.last`` (:issue:`53710`)
 - Removed ``DataFrameGroupBy.grouper`` and ``SeriesGroupBy.grouper`` (:issue:`56521`)
 - Removed ``DataFrameGroupby.fillna`` and ``SeriesGroupBy.fillna``` (:issue:`55719`)
+- Removed ``Series.ravel`` (:issue:`56053`)
+- Removed ``Series.view`` (:issue:`56054`)
 - Removed ``axis`` argument from :meth:`DataFrame.groupby`, :meth:`Series.groupby`, :meth:`DataFrame.rolling`, :meth:`Series.rolling`, :meth:`DataFrame.resample`, and :meth:`Series.resample` (:issue:`51203`)
 - Removed ``axis`` argument from all groupby operations (:issue:`50405`)
 - Removed ``pandas.io.sql.execute`` (:issue:`50185`)
 - Removed ``read_gbq`` and ``DataFrame.to_gbq``. Use ``pandas_gbq.read_gbq`` and ``pandas_gbq.to_gbq`` instead https://pandas-gbq.readthedocs.io/en/latest/api.html (:issue:`55525`)
 - Removed deprecated argument ``obj`` in :meth:`.DataFrameGroupBy.get_group` and :meth:`.SeriesGroupBy.get_group` (:issue:`53545`)
 - Removed the ``ArrayManager`` (:issue:`55043`)
+- Removed the ``fastpath`` argument from the :class:`Series` constructor (:issue:`55466`)
 - Removed the ``is_boolean``, ``is_integer``, ``is_floating``, ``holds_integer``, ``is_numeric``, ``is_categorical``, ``is_object``, and ``is_interval`` attributes of :class:`Index` (:issue:`50042`)
 - Removed unused arguments ``*args`` and ``**kwargs`` in :class:`Resampler` methods (:issue:`50977`)
 - Unrecognized timezones when parsing strings to datetimes now raises a ``ValueError`` (:issue:`51477`)

pandas/core/series.py

@@ -385,18 +385,7 @@ def __init__(
         dtype: Dtype | None = None,
         name=None,
         copy: bool | None = None,
-        fastpath: bool | lib.NoDefault = lib.no_default,
     ) -> None:
-        if fastpath is not lib.no_default:
-            warnings.warn(
-                "The 'fastpath' keyword in pd.Series is deprecated and will "
-                "be removed in a future version.",
-                DeprecationWarning,
-                stacklevel=find_stack_level(),
-            )
-        else:
-            fastpath = False
-
         allow_mgr = False
         if (
             isinstance(data, SingleBlockManager)
@@ -417,11 +406,7 @@ def __init__(
                 data = data.copy(deep=False)
             # GH#33357 called with just the SingleBlockManager
             NDFrame.__init__(self, data)
-            if fastpath:
-                # e.g. from _box_col_values, skip validation of name
-                object.__setattr__(self, "_name", name)
-            else:
-                self.name = name
+            self.name = name
             return
 
         is_pandas_object = isinstance(data, (Series, Index, ExtensionArray))
@@ -435,31 +420,6 @@ def __init__(
         if copy is None:
             copy = False
 
-        # we are called internally, so short-circuit
-        if fastpath:
-            # data is a ndarray, index is defined
-            if not isinstance(data, SingleBlockManager):
-                data = SingleBlockManager.from_array(data, index)
-                allow_mgr = True
-            elif using_copy_on_write() and not copy:
-                data = data.copy(deep=False)
-
-            if not allow_mgr:
-                warnings.warn(
-                    f"Passing a {type(data).__name__} to {type(self).__name__} "
-                    "is deprecated and will raise in a future version. "
-                    "Use public APIs instead.",
-                    DeprecationWarning,
-                    stacklevel=2,
-                )
-
-            if copy:
-                data = data.copy()
-            # skips validation of the name
-            object.__setattr__(self, "_name", name)
-            NDFrame.__init__(self, data)
-            return
-
         if isinstance(data, SingleBlockManager) and using_copy_on_write() and not copy:
             data = data.copy(deep=False)
 
@@ -851,104 +811,12 @@ def _references(self) -> BlockValuesRefs:
     def array(self) -> ExtensionArray:
         return self._mgr.array_values()
 
-    # ops
-    def ravel(self, order: str = "C") -> ArrayLike:
-        """
-        Return the flattened underlying data as an ndarray or ExtensionArray.
-
-        .. deprecated:: 2.2.0
-            Series.ravel is deprecated. The underlying array is already 1D, so
-            ravel is not necessary.  Use :meth:`to_numpy` for conversion to a numpy
-            array instead.
-
-        Returns
-        -------
-        numpy.ndarray or ExtensionArray
-            Flattened data of the Series.
-
-        See Also
-        --------
-        numpy.ndarray.ravel : Return a flattened array.
-
-        Examples
-        --------
-        >>> s = pd.Series([1, 2, 3])
-        >>> s.ravel()  # doctest: +SKIP
-        array([1, 2, 3])
-        """
-        warnings.warn(
-            "Series.ravel is deprecated. The underlying array is already 1D, so "
-            "ravel is not necessary.  Use `to_numpy()` for conversion to a numpy "
-            "array instead.",
-            FutureWarning,
-            stacklevel=2,
-        )
-        arr = self._values.ravel(order=order)
-        if isinstance(arr, np.ndarray) and using_copy_on_write():
-            arr.flags.writeable = False
-        return arr
-
     def __len__(self) -> int:
         """
         Return the length of the Series.
         """
         return len(self._mgr)
 
-    def view(self, dtype: Dtype | None = None) -> Series:
-        """
-        Create a new view of the Series.
-
-        .. deprecated:: 2.2.0
-            ``Series.view`` is deprecated and will be removed in a future version.
-            Use :meth:`Series.astype` as an alternative to change the dtype.
-
-        This function will return a new Series with a view of the same
-        underlying values in memory, optionally reinterpreted with a new data
-        type. The new data type must preserve the same size in bytes as to not
-        cause index misalignment.
-
-        Parameters
-        ----------
-        dtype : data type
-            Data type object or one of their string representations.
-
-        Returns
-        -------
-        Series
-            A new Series object as a view of the same data in memory.
-
-        See Also
-        --------
-        numpy.ndarray.view : Equivalent numpy function to create a new view of
-            the same data in memory.
-
-        Notes
-        -----
-        Series are instantiated with ``dtype=float64`` by default. While
-        ``numpy.ndarray.view()`` will return a view with the same data type as
-        the original array, ``Series.view()`` (without specified dtype)
-        will try using ``float64`` and may fail if the original data type size
-        in bytes is not the same.
-
-        Examples
-        --------
-        Use ``astype`` to change the dtype instead.
-        """
-        warnings.warn(
-            "Series.view is deprecated and will be removed in a future version. "
-            "Use ``astype`` as an alternative to change the dtype.",
-            FutureWarning,
-            stacklevel=2,
-        )
-        # self.array instead of self._values so we piggyback on NumpyExtensionArray
-        #  implementation
-        res_values = self.array.view(dtype)
-        res_ser = self._constructor(res_values, index=self.index, copy=False)
-        if isinstance(res_ser._mgr, SingleBlockManager):
-            blk = res_ser._mgr._block
-            blk.refs.add_reference(blk)
-        return res_ser.__finalize__(self, method="view")
-
     # ----------------------------------------------------------------------
     # NDArray Compat
     def __array__(self, dtype: npt.DTypeLike | None = None) -> np.ndarray:

pandas/tests/copy_view/test_array.py

@@ -110,16 +110,6 @@ def test_series_to_numpy(using_copy_on_write):
     assert arr.flags.writeable is True
 
 
-@pytest.mark.parametrize("order", ["F", "C"])
-def test_ravel_read_only(using_copy_on_write, order):
-    ser = Series([1, 2, 3])
-    with tm.assert_produces_warning(FutureWarning, match="is deprecated"):
-        arr = ser.ravel(order=order)
-    if using_copy_on_write:
-        assert arr.flags.writeable is False
-    assert np.shares_memory(get_array(ser), arr)
-
-
 def test_series_array_ea_dtypes(using_copy_on_write):
     ser = Series([1, 2, 3], dtype="Int64")
     arr = np.asarray(ser, dtype="int64")

pandas/tests/copy_view/test_constructors.py

@@ -90,18 +90,13 @@ def test_series_from_series_with_reindex(using_copy_on_write):
         assert not result._mgr.blocks[0].refs.has_reference()
 
 
-@pytest.mark.parametrize("fastpath", [False, True])
 @pytest.mark.parametrize("dtype", [None, "int64"])
 @pytest.mark.parametrize("idx", [None, pd.RangeIndex(start=0, stop=3, step=1)])
 @pytest.mark.parametrize(
     "arr", [np.array([1, 2, 3], dtype="int64"), pd.array([1, 2, 3], dtype="Int64")]
 )
-def test_series_from_array(using_copy_on_write, idx, dtype, fastpath, arr):
-    if idx is None or dtype is not None:
-        fastpath = False
-    msg = "The 'fastpath' keyword in pd.Series is deprecated"
-    with tm.assert_produces_warning(DeprecationWarning, match=msg):
-        ser = Series(arr, dtype=dtype, index=idx, fastpath=fastpath)
+def test_series_from_array(using_copy_on_write, idx, dtype, arr):
+    ser = Series(arr, dtype=dtype, index=idx)
     ser_orig = ser.copy()
     data = getattr(arr, "_data", arr)
     if using_copy_on_write:
@@ -153,28 +148,6 @@ def test_series_from_index_different_dtypes(using_copy_on_write):
         assert ser._mgr._has_no_reference(0)
 
 
-@pytest.mark.filterwarnings("ignore:Setting a value on a view:FutureWarning")
-@pytest.mark.parametrize("fastpath", [False, True])
-@pytest.mark.parametrize("dtype", [None, "int64"])
-@pytest.mark.parametrize("idx", [None, pd.RangeIndex(start=0, stop=3, step=1)])
-def test_series_from_block_manager(using_copy_on_write, idx, dtype, fastpath):
-    ser = Series([1, 2, 3], dtype="int64")
-    ser_orig = ser.copy()
-    msg = "The 'fastpath' keyword in pd.Series is deprecated"
-    with tm.assert_produces_warning(DeprecationWarning, match=msg):
-        ser2 = Series(ser._mgr, dtype=dtype, fastpath=fastpath, index=idx)
-    assert np.shares_memory(get_array(ser), get_array(ser2))
-    if using_copy_on_write:
-        assert not ser2._mgr._has_no_reference(0)
-
-    ser2.iloc[0] = 100
-    if using_copy_on_write:
-        tm.assert_series_equal(ser, ser_orig)
-    else:
-        expected = Series([100, 2, 3])
-        tm.assert_series_equal(ser, expected)
-
-
 def test_series_from_block_manager_different_dtype(using_copy_on_write):
     ser = Series([1, 2, 3], dtype="int64")
     msg = "Passing a SingleBlockManager to Series"

pandas/tests/copy_view/test_methods.py

@@ -1859,25 +1859,6 @@ def test_count_read_only_array():
     tm.assert_series_equal(result, expected)
 
 
-def test_series_view(using_copy_on_write):
-    ser = Series([1, 2, 3])
-    ser_orig = ser.copy()
-
-    with tm.assert_produces_warning(FutureWarning, match="is deprecated"):
-        ser2 = ser.view()
-    assert np.shares_memory(get_array(ser), get_array(ser2))
-    if using_copy_on_write:
-        assert not ser2._mgr._has_no_reference(0)
-
-    ser2.iloc[0] = 100
-
-    if using_copy_on_write:
-        tm.assert_series_equal(ser_orig, ser)
-    else:
-        expected = Series([100, 2, 3])
-        tm.assert_series_equal(ser, expected)
-
-
 def test_insert_series(using_copy_on_write):
     df = DataFrame({"a": [1, 2, 3]})
     ser = Series([1, 2, 3])

pandas/tests/frame/indexing/test_where.py

@@ -761,15 +761,13 @@ def test_where_interval_fullop_downcast(self, frame_or_series):
             "timedelta64[ns]",
             "datetime64[ns]",
             "datetime64[ns, Asia/Tokyo]",
-            "Period[D]",
         ],
     )
     def test_where_datetimelike_noop(self, dtype):
         # GH#45135, analogue to GH#44181 for Period don't raise on no-op
         # For td64/dt64/dt64tz we already don't raise, but also are
         #  checking that we don't unnecessarily upcast to object.
-        with tm.assert_produces_warning(FutureWarning, match="is deprecated"):
-            ser = Series(np.arange(3) * 10**9, dtype=np.int64).view(dtype)
+        ser = Series(np.arange(3) * 10**9, dtype=np.int64).astype(dtype)
         df = ser.to_frame()
         mask = np.array([False, False, False])
 

pandas/tests/series/methods/test_view.py

@@ -138,13 +138,6 @@ def test_ndarray_compat_like_func(self):
         expected = Series(1, index=range(10), dtype="float64")
         tm.assert_series_equal(result, expected)
 
-    def test_ndarray_compat_ravel(self):
-        # ravel
-        s = Series(np.random.default_rng(2).standard_normal(10))
-        with tm.assert_produces_warning(FutureWarning, match="ravel is deprecated"):
-            result = s.ravel(order="F")
-        tm.assert_almost_equal(result, s.values.ravel(order="F"))
-
     def test_empty_method(self):
         s_empty = Series(dtype=object)
         assert s_empty.empty