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v0.23.2.txt
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.. _whatsnew_0232:
v0.23.2
-------
This is a minor bug-fix release in the 0.23.x series and includes some small regression fixes
and bug fixes. We recommend that all users upgrade to this version.
.. note::
Pandas 0.23.2 is first pandas release that's compatible with
Python 3.7 (:issue:`20552`)
.. contents:: What's new in v0.23.2
:local:
:backlinks: none
.. _whatsnew_0232.enhancements:
Logical Reductions over Entire DataFrame
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:meth:`DataFrame.all` and :meth:`DataFrame.any` now accept ``axis=None`` to reduce over all axes to a scalar (:issue:`19976`)
.. ipython:: python
df = pd.DataFrame({"A": [1, 2], "B": [True, False]})
df.all(axis=None)
This also provides compatibility with NumPy 1.15, which now dispatches to ``DataFrame.all``.
With NumPy 1.15 and pandas 0.23.1 or earlier, :func:`numpy.all` will no longer reduce over every axis:
.. code-block:: python
>>> # NumPy 1.15, pandas 0.23.1
>>> np.any(pd.DataFrame({"A": [False], "B": [False]}))
A False
B False
dtype: bool
With pandas 0.23.2, that will correctly return False, as it did with NumPy < 1.15.
.. ipython:: python
np.any(pd.DataFrame({"A": [False], "B": [False]}))
.. _whatsnew_0232.fixed_regressions:
Fixed Regressions
~~~~~~~~~~~~~~~~~
- Fixed regression in :meth:`to_csv` when handling file-like object incorrectly (:issue:`21471`)
- Re-allowed duplicate level names of a ``MultiIndex``. Accessing a level that has a duplicate name by name still raises an error (:issue:`19029`).
- Bug in both :meth:`DataFrame.first_valid_index` and :meth:`Series.first_valid_index` raised for a row index having duplicate values (:issue:`21441`)
- Fixed printing of DataFrames with hierarchical columns with long names (:issue:`21180`)
- Fixed regression in :meth:`~DataFrame.reindex` and :meth:`~DataFrame.groupby`
with a MultiIndex or multiple keys that contains categorical datetime-like values (:issue:`21390`).
- Fixed regression in unary negative operations with object dtype (:issue:`21380`)
- Bug in :meth:`Timestamp.ceil` and :meth:`Timestamp.floor` when timestamp is a multiple of the rounding frequency (:issue:`21262`)
- Fixed regression in :func:`to_clipboard` that defaulted to copying dataframes with space delimited instead of tab delimited (:issue:`21104`)
.. _whatsnew_0232.performance:
Performance Improvements
~~~~~~~~~~~~~~~~~~~~~~~~
- Improved performance of membership checks in :class:`Categorical` and :class:`CategoricalIndex`
(i.e. ``x in cat``-style checks are much faster). :meth:`CategoricalIndex.contains`
is likewise much faster (:issue:`21369`, :issue:`21508`)
- Improved performance of :meth:`HDFStore.groups` (and dependent functions like
:meth:`~HDFStore.keys`. (i.e. ``x in store`` checks are much faster)
(:issue:`21372`)
- Improved performance of :meth:`MultiIndex.is_unique` (:issue:`21522`)
-
Documentation Changes
~~~~~~~~~~~~~~~~~~~~~
-
-
Build Changes
-------------
- The source and binary distributions no longer include test data files, resulting in smaller download sizes. Tests relying on these data files will be skipped when using ``pandas.test()``. (:issue:`19320`)
.. _whatsnew_0232.bug_fixes:
Bug Fixes
~~~~~~~~~
**Groupby/Resample/Rolling**
-
-
**Timedelta**
- Bug in :class:`Timedelta` where non-zero timedeltas shorter than 1 microsecond were considered False (:issue:`21484`)
**Conversion**
- Bug in constructing :class:`Index` with an iterator or generator (:issue:`21470`)
- Bug in :meth:`Series.nlargest` for signed and unsigned integer dtypes when the minimum value is present (:issue:`21426`)
**Indexing**
- Bug in :meth:`Index.get_indexer_non_unique` with categorical key (:issue:`21448`)
- Bug in comparison operations for :class:`MultiIndex` where error was raised on equality / inequality comparison involving a MultiIndex with ``nlevels == 1`` (:issue:`21149`)
- Bug in :meth:`DataFrame.drop` behaviour is not consistent for unique and non-unique indexes (:issue:`21494`)
- Bug in :func:`DataFrame.duplicated` with a large number of columns causing a 'maximum recursion depth exceeded' (:issue:`21524`).
-
**I/O**
- Bug in :func:`read_csv` that caused it to incorrectly raise an error when ``nrows=0``, ``low_memory=True``, and ``index_col`` was not ``None`` (:issue:`21141`)
- Bug in :func:`json_normalize` when formatting the ``record_prefix`` with integer columns (:issue:`21536`)
-
**Plotting**
-
-
**Reshaping**
-
-
**Categorical**
- Bug in rendering :class:`Series` with ``Categorical`` dtype in rare conditions under Python 2.7 (:issue:`21002`)
-
**Timezones**
- Bug in :class:`Timestamp` and :class:`DatetimeIndex` where passing a :class:`Timestamp` localized after a DST transition would return a datetime before the DST transition (:issue:`20854`)
- Bug in comparing :class:`DataFrame`s with tz-aware :class:`DatetimeIndex` columns with a DST transition that raised a ``KeyError`` (:issue:`19970`)
**Other**
-