diff --git a/doc/source/whatsnew/v1.0.0.rst b/doc/source/whatsnew/v1.0.0.rst index 98d861d999ea9..111b2e736b21c 100644 --- a/doc/source/whatsnew/v1.0.0.rst +++ b/doc/source/whatsnew/v1.0.0.rst @@ -275,6 +275,7 @@ or ``matplotlib.Axes.plot``. See :ref:`plotting.formatters` for more. - :meth:`pandas.Series.str.cat` does not accept list-likes *within* list-likes anymore (:issue:`27611`) - Removed the previously deprecated :meth:`ExtensionArray._formatting_values`. Use :attr:`ExtensionArray._formatter` instead. (:issue:`23601`) - Removed the previously deprecated ``IntervalIndex.from_intervals`` in favor of the :class:`IntervalIndex` constructor (:issue:`19263`) +- Changed the default value for the "keep_tz" argument in :meth:`DatetimeIndex.to_series` to ``True`` (:issue:`23739`) - Ability to read pickles containing :class:`Categorical` instances created with pre-0.16 version of pandas has been removed (:issue:`27538`) - Removed the previously deprecated ``reduce`` and ``broadcast`` arguments from :meth:`DataFrame.apply` (:issue:`18577`) - Removed the previously deprecated ``assert_raises_regex`` function in ``pandas.util.testing`` (:issue:`29174`) diff --git a/pandas/core/indexes/datetimes.py b/pandas/core/indexes/datetimes.py index 4a95f0a2ab7e9..b6891bc7e2b59 100644 --- a/pandas/core/indexes/datetimes.py +++ b/pandas/core/indexes/datetimes.py @@ -663,14 +663,14 @@ def _get_time_micros(self): values = self._data._local_timestamps() return fields.get_time_micros(values) - def to_series(self, keep_tz=None, index=None, name=None): + def to_series(self, keep_tz=lib._no_default, index=None, name=None): """ Create a Series with both index and values equal to the index keys useful with map for returning an indexer based on an index. Parameters ---------- - keep_tz : optional, defaults False + keep_tz : optional, defaults True Return the data keeping the timezone. If keep_tz is True: @@ -686,10 +686,10 @@ def to_series(self, keep_tz=None, index=None, name=None): Series will have a datetime64[ns] dtype. TZ aware objects will have the tz removed. - .. versionchanged:: 0.24 - The default value will change to True in a future release. - You can set ``keep_tz=True`` to already obtain the future - behaviour and silence the warning. + .. versionchanged:: 1.0.0 + The default value is now True. In a future version, + this keyword will be removed entirely. Stop passing the + argument to obtain the future behavior and silence the warning. index : Index, optional Index of resulting Series. If None, defaults to original index. @@ -708,27 +708,27 @@ def to_series(self, keep_tz=None, index=None, name=None): if name is None: name = self.name - if keep_tz is None and self.tz is not None: - warnings.warn( - "The default of the 'keep_tz' keyword in " - "DatetimeIndex.to_series will change " - "to True in a future release. You can set " - "'keep_tz=True' to obtain the future behaviour and " - "silence this warning.", - FutureWarning, - stacklevel=2, - ) - keep_tz = False - elif keep_tz is False: - warnings.warn( - "Specifying 'keep_tz=False' is deprecated and this " - "option will be removed in a future release. If " - "you want to remove the timezone information, you " - "can do 'idx.tz_convert(None)' before calling " - "'to_series'.", - FutureWarning, - stacklevel=2, - ) + if keep_tz is not lib._no_default: + if keep_tz: + warnings.warn( + "The 'keep_tz' keyword in DatetimeIndex.to_series " + "is deprecated and will be removed in a future version. " + "You can stop passing 'keep_tz' to silence this warning.", + FutureWarning, + stacklevel=2, + ) + else: + warnings.warn( + "Specifying 'keep_tz=False' is deprecated and this " + "option will be removed in a future release. If " + "you want to remove the timezone information, you " + "can do 'idx.tz_convert(None)' before calling " + "'to_series'.", + FutureWarning, + stacklevel=2, + ) + else: + keep_tz = True if keep_tz and self.tz is not None: # preserve the tz & copy diff --git a/pandas/tests/frame/test_alter_axes.py b/pandas/tests/frame/test_alter_axes.py index 21470151dcfbd..6206b333d29e1 100644 --- a/pandas/tests/frame/test_alter_axes.py +++ b/pandas/tests/frame/test_alter_axes.py @@ -493,29 +493,29 @@ def test_convert_dti_to_series(self): tm.assert_series_equal(result, expected) # convert to series while keeping the timezone - result = idx.to_series(keep_tz=True, index=[0, 1]) + msg = "stop passing 'keep_tz'" + with tm.assert_produces_warning(FutureWarning) as m: + result = idx.to_series(keep_tz=True, index=[0, 1]) tm.assert_series_equal(result, expected) + assert msg in str(m[0].message) # convert to utc - with tm.assert_produces_warning(FutureWarning): + with tm.assert_produces_warning(FutureWarning) as m: df["B"] = idx.to_series(keep_tz=False, index=[0, 1]) result = df["B"] comp = Series(DatetimeIndex(expected.values).tz_localize(None), name="B") tm.assert_series_equal(result, comp) - - with tm.assert_produces_warning(FutureWarning) as m: - result = idx.to_series(index=[0, 1]) - tm.assert_series_equal(result, expected.dt.tz_convert(None)) - msg = ( - "The default of the 'keep_tz' keyword in " - "DatetimeIndex.to_series will change to True in a future " - "release." - ) + msg = "do 'idx.tz_convert(None)' before calling" assert msg in str(m[0].message) - with tm.assert_produces_warning(FutureWarning): + result = idx.to_series(index=[0, 1]) + tm.assert_series_equal(result, expected) + + with tm.assert_produces_warning(FutureWarning) as m: result = idx.to_series(keep_tz=False, index=[0, 1]) tm.assert_series_equal(result, expected.dt.tz_convert(None)) + msg = "do 'idx.tz_convert(None)' before calling" + assert msg in str(m[0].message) # list of datetimes with a tz df["B"] = idx.to_pydatetime() diff --git a/pandas/tests/frame/test_constructors.py b/pandas/tests/frame/test_constructors.py index cccce96a874dd..cc2e37c14bdf0 100644 --- a/pandas/tests/frame/test_constructors.py +++ b/pandas/tests/frame/test_constructors.py @@ -1795,7 +1795,7 @@ def test_constructor_with_datetimes(self): # preserver an index with a tz on dict construction i = date_range("1/1/2011", periods=5, freq="10s", tz="US/Eastern") - expected = DataFrame({"a": i.to_series(keep_tz=True).reset_index(drop=True)}) + expected = DataFrame({"a": i.to_series().reset_index(drop=True)}) df = DataFrame() df["a"] = i tm.assert_frame_equal(df, expected) @@ -1806,9 +1806,7 @@ def test_constructor_with_datetimes(self): # multiples i_no_tz = date_range("1/1/2011", periods=5, freq="10s") df = DataFrame({"a": i, "b": i_no_tz}) - expected = DataFrame( - {"a": i.to_series(keep_tz=True).reset_index(drop=True), "b": i_no_tz} - ) + expected = DataFrame({"a": i.to_series().reset_index(drop=True), "b": i_no_tz}) tm.assert_frame_equal(df, expected) def test_constructor_datetimes_with_nulls(self): diff --git a/pandas/tests/test_base.py b/pandas/tests/test_base.py index d9bdceb258592..58093ba4d90a5 100644 --- a/pandas/tests/test_base.py +++ b/pandas/tests/test_base.py @@ -179,7 +179,7 @@ def setup_method(self, method): self.int_series = Series(arr, index=self.int_index, name="a") self.float_series = Series(arr, index=self.float_index, name="a") self.dt_series = Series(arr, index=self.dt_index, name="a") - self.dt_tz_series = self.dt_tz_index.to_series(keep_tz=True) + self.dt_tz_series = self.dt_tz_index.to_series() self.period_series = Series(arr, index=self.period_index, name="a") self.string_series = Series(arr, index=self.string_index, name="a") self.unicode_series = Series(arr, index=self.unicode_index, name="a")