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Aug 1, 2023
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DOC: Move performance improvements in whatsnew #54339

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DOC: Move performance improvements in whatsnew
rhshadrach Aug 1, 2023
7742e0e
fixup
rhshadrach Aug 1, 2023
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22 changes: 11 additions & 11 deletions doc/source/whatsnew/v2.1.0.rst
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Expand Up @@ -149,15 +149,6 @@ Other enhancements
- Adding ``engine_kwargs`` parameter to :meth:`DataFrame.read_excel` (:issue:`52214`)
- Classes that are useful for type-hinting have been added to the public API in the new submodule ``pandas.api.typing`` (:issue:`48577`)
- Implemented :attr:`Series.dt.is_month_start`, :attr:`Series.dt.is_month_end`, :attr:`Series.dt.is_year_start`, :attr:`Series.dt.is_year_end`, :attr:`Series.dt.is_quarter_start`, :attr:`Series.dt.is_quarter_end`, :attr:`Series.dt.is_days_in_month`, :attr:`Series.dt.unit`, :meth:`Series.dt.is_normalize`, :meth:`Series.dt.day_name`, :meth:`Series.dt.month_name`, :meth:`Series.dt.tz_convert` for :class:`ArrowDtype` with ``pyarrow.timestamp`` (:issue:`52388`, :issue:`51718`)
- Implemented :func:`api.interchange.from_dataframe` for :class:`DatetimeTZDtype` (:issue:`54239`)
- Implemented ``__from_arrow__`` on :class:`DatetimeTZDtype`. (:issue:`52201`)
- Implemented ``__pandas_priority__`` to allow custom types to take precedence over :class:`DataFrame`, :class:`Series`, :class:`Index`, or :class:`ExtensionArray` for arithmetic operations, :ref:`see the developer guide <extending.pandas_priority>` (:issue:`48347`)
- Improve error message when having incompatible columns using :meth:`DataFrame.merge` (:issue:`51861`)
- Improve error message when setting :class:`DataFrame` with wrong number of columns through :meth:`DataFrame.isetitem` (:issue:`51701`)
- Improved error handling when using :meth:`DataFrame.to_json` with incompatible ``index`` and ``orient`` arguments (:issue:`52143`)
- Improved error message when creating a DataFrame with empty data (0 rows), no index and an incorrect number of columns. (:issue:`52084`)
- Let :meth:`DataFrame.to_feather` accept a non-default :class:`Index` and non-string column names (:issue:`51787`)
- Performance improvement in :func:`read_csv` (:issue:`52632`) with ``engine="c"``
- :meth:`Categorical.from_codes` has gotten a ``validate`` parameter (:issue:`50975`)
- :meth:`DataFrame.stack` gained the ``sort`` keyword to dictate whether the resulting :class:`MultiIndex` levels are sorted (:issue:`15105`)
- :meth:`DataFrame.unstack` gained the ``sort`` keyword to dictate whether the resulting :class:`MultiIndex` levels are sorted (:issue:`15105`)
Expand All @@ -168,13 +159,19 @@ Other enhancements
- :meth:`SeriesGroupby.transform` and :meth:`DataFrameGroupby.transform` now support passing in a string as the function for ``engine="numba"`` (:issue:`53579`)
- Added :meth:`ExtensionArray.interpolate` used by :meth:`Series.interpolate` and :meth:`DataFrame.interpolate` (:issue:`53659`)
- Added ``engine_kwargs`` parameter to :meth:`DataFrame.to_excel` (:issue:`53220`)
- Implemented :func:`api.interchange.from_dataframe` for :class:`DatetimeTZDtype` (:issue:`54239`)
- Implemented ``__from_arrow__`` on :class:`DatetimeTZDtype`. (:issue:`52201`)
- Implemented ``__pandas_priority__`` to allow custom types to take precedence over :class:`DataFrame`, :class:`Series`, :class:`Index`, or :class:`ExtensionArray` for arithmetic operations, :ref:`see the developer guide <extending.pandas_priority>` (:issue:`48347`)
- Improve error message when having incompatible columns using :meth:`DataFrame.merge` (:issue:`51861`)
- Improve error message when setting :class:`DataFrame` with wrong number of columns through :meth:`DataFrame.isetitem` (:issue:`51701`)
- Improved error handling when using :meth:`DataFrame.to_json` with incompatible ``index`` and ``orient`` arguments (:issue:`52143`)
- Improved error message when creating a DataFrame with empty data (0 rows), no index and an incorrect number of columns. (:issue:`52084`)
- Let :meth:`DataFrame.to_feather` accept a non-default :class:`Index` and non-string column names (:issue:`51787`)
- Added a new parameter ``by_row`` to :meth:`Series.apply` and :meth:`DataFrame.apply`. When set to ``False`` the supplied callables will always operate on the whole Series or DataFrame (:issue:`53400`, :issue:`53601`).
- :meth:`DataFrame.shift` and :meth:`Series.shift` now allow shifting by multiple periods by supplying a list of periods (:issue:`44424`)
- Groupby aggregations (such as :meth:`DataFrameGroupby.sum`) now can preserve the dtype of the input instead of casting to ``float64`` (:issue:`44952`)
- Improved error message when :meth:`DataFrameGroupBy.agg` failed (:issue:`52930`)
- Many read/to_* functions, such as :meth:`DataFrame.to_pickle` and :func:`read_csv`, support forwarding compression arguments to lzma.LZMAFile (:issue:`52979`)
- Performance improvement in :func:`concat` with homogeneous ``np.float64`` or ``np.float32`` dtypes (:issue:`52685`)
- Performance improvement in :meth:`DataFrame.filter` when ``items`` is given (:issue:`52941`)
- Reductions :meth:`Series.argmax`, :meth:`Series.argmin`, :meth:`Series.idxmax`, :meth:`Series.idxmin`, :meth:`Index.argmax`, :meth:`Index.argmin`, :meth:`DataFrame.idxmax`, :meth:`DataFrame.idxmin` are now supported for object-dtype objects (:issue:`4279`, :issue:`18021`, :issue:`40685`, :issue:`43697`)
-

Expand Down Expand Up @@ -429,11 +426,13 @@ Other Deprecations

Performance improvements
~~~~~~~~~~~~~~~~~~~~~~~~
- Performance improvement in :func:`concat` with homogeneous ``np.float64`` or ``np.float32`` dtypes (:issue:`52685`)
- Performance improvement in :func:`factorize` for object columns not containing strings (:issue:`51921`)
- Performance improvement in :func:`read_orc` when reading a remote URI file path. (:issue:`51609`)
- Performance improvement in :func:`read_parquet` and :meth:`DataFrame.to_parquet` when reading a remote file with ``engine="pyarrow"`` (:issue:`51609`)
- Performance improvement in :func:`read_parquet` on string columns when using ``use_nullable_dtypes=True`` (:issue:`47345`)
- Performance improvement in :meth:`DataFrame.clip` and :meth:`Series.clip` (:issue:`51472`)
- Performance improvement in :meth:`DataFrame.filter` when ``items`` is given (:issue:`52941`)
- Performance improvement in :meth:`DataFrame.first_valid_index` and :meth:`DataFrame.last_valid_index` for extension array dtypes (:issue:`51549`)
- Performance improvement in :meth:`DataFrame.where` when ``cond`` is backed by an extension dtype (:issue:`51574`)
- Performance improvement in :meth:`MultiIndex.set_levels` and :meth:`MultiIndex.set_codes` when ``verify_integrity=True`` (:issue:`51873`)
Expand All @@ -450,6 +449,7 @@ Performance improvements
- Performance improvement in :class:`Series` reductions (:issue:`52341`)
- Performance improvement in :func:`concat` when ``axis=1`` and objects have different indexes (:issue:`52541`)
- Performance improvement in :func:`concat` when the concatenation axis is a :class:`MultiIndex` (:issue:`53574`)
- Performance improvement in :func:`read_csv` with ``engine="c"`` (:issue:`52632`)
- Performance improvement in :meth:`.DataFrameGroupBy.groups` (:issue:`53088`)
- Performance improvement in :meth:`DataFrame.astype` when ``dtype`` is an extension dtype (:issue:`54299`)
- Performance improvement in :meth:`DataFrame.isin` for extension dtypes (:issue:`53514`)
Expand Down