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v0.23.1.txt
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.. _whatsnew_0231:
v0.23.1
-------
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.
.. warning::
Starting January 1, 2019, pandas feature releases will support Python 3 only.
See :ref:`install.dropping-27` for more.
.. contents:: What's new in v0.23.1
:local:
:backlinks: none
.. _whatsnew_0231.fixed_regressions:
Fixed Regressions
~~~~~~~~~~~~~~~~~
**Comparing Series with datetime.date**
We've reverted a 0.23.0 change to comparing a :class:`Series` holding datetimes and a ``datetime.date`` object (:issue:`21152`).
In pandas 0.22 and earlier, comparing a Series holding datetimes and ``datetime.date`` objects would coerce the ``datetime.date`` to a datetime before comapring.
This was inconsistent with Python, NumPy, and :class:`DatetimeIndex`, which never consider a datetime and ``datetime.date`` equal.
In 0.23.0, we unified operations between DatetimeIndex and Series, and in the process changed comparisons between a Series of datetimes and ``datetime.date`` without warning.
We've temporarily restored the 0.22.0 behavior, so datetimes and dates may again compare equal, but restore the 0.23.0 behavior in a future release.
To summarize, here's the behavior in 0.22.0, 0.23.0, 0.23.1:
.. code-block:: python
# 0.22.0... Silently coerce the datetime.date
>>> Series(pd.date_range('2017', periods=2)) == datetime.date(2017, 1, 1)
0 True
1 False
dtype: bool
# 0.23.0... Do not coerce the datetime.date
>>> Series(pd.date_range('2017', periods=2)) == datetime.date(2017, 1, 1)
0 False
1 False
dtype: bool
# 0.23.1... Coerce the datetime.date with a warning
>>> Series(pd.date_range('2017', periods=2)) == datetime.date(2017, 1, 1)
/bin/python:1: FutureWarning: Comparing Series of datetimes with 'datetime.date'. Currently, the
'datetime.date' is coerced to a datetime. In the future pandas will
not coerce, and the values not compare equal to the 'datetime.date'.
To retain the current behavior, convert the 'datetime.date' to a
datetime with 'pd.Timestamp'.
#!/bin/python3
0 True
1 False
dtype: bool
In addition, ordering comparisons will raise a ``TypeError`` in the future.
**Other Fixes**
- Reverted the ability of :func:`~DataFrame.to_sql` to perform multivalue
inserts as this caused regression in certain cases (:issue:`21103`).
In the future this will be made configurable.
- Fixed regression in the :attr:`DatetimeIndex.date` and :attr:`DatetimeIndex.time`
attributes in case of timezone-aware data: :attr:`DatetimeIndex.time` returned
a tz-aware time instead of tz-naive (:issue:`21267`) and :attr:`DatetimeIndex.date`
returned incorrect date when the input date has a non-UTC timezone (:issue:`21230`).
- Fixed regression in :meth:`pandas.io.json.json_normalize` when called with ``None`` values
in nested levels in JSON, and to not drop keys with value as `None` (:issue:`21158`, :issue:`21356`).
- Bug in :meth:`~DataFrame.to_csv` causes encoding error when compression and encoding are specified (:issue:`21241`, :issue:`21118`)
- Bug preventing pandas from being importable with -OO optimization (:issue:`21071`)
- Bug in :meth:`Categorical.fillna` incorrectly raising a ``TypeError`` when `value` the individual categories are iterable and `value` is an iterable (:issue:`21097`, :issue:`19788`)
- Fixed regression in constructors coercing NA values like ``None`` to strings when passing ``dtype=str`` (:issue:`21083`)
- Regression in :func:`pivot_table` where an ordered ``Categorical`` with missing
values for the pivot's ``index`` would give a mis-aligned result (:issue:`21133`)
- Fixed regression in merging on boolean index/columns (:issue:`21119`).
.. _whatsnew_0231.performance:
Performance Improvements
~~~~~~~~~~~~~~~~~~~~~~~~
- Improved performance of :meth:`CategoricalIndex.is_monotonic_increasing`, :meth:`CategoricalIndex.is_monotonic_decreasing` and :meth:`CategoricalIndex.is_monotonic` (:issue:`21025`)
- Improved performance of :meth:`CategoricalIndex.is_unique` (:issue:`21107`)
.. _whatsnew_0231.bug_fixes:
Bug Fixes
~~~~~~~~~
**Groupby/Resample/Rolling**
- Bug in :func:`DataFrame.agg` where applying multiple aggregation functions to a :class:`DataFrame` with duplicated column names would cause a stack overflow (:issue:`21063`)
- Bug in :func:`pandas.core.groupby.GroupBy.ffill` and :func:`pandas.core.groupby.GroupBy.bfill` where the fill within a grouping would not always be applied as intended due to the implementations' use of a non-stable sort (:issue:`21207`)
- Bug in :func:`pandas.core.groupby.GroupBy.rank` where results did not scale to 100% when specifying ``method='dense'`` and ``pct=True``
- Bug in :func:`pandas.DataFrame.rolling` and :func:`pandas.Series.rolling` which incorrectly accepted a 0 window size rather than raising (:issue:`21286`)
**Data-type specific**
- Bug in :meth:`Series.str.replace()` where the method throws `TypeError` on Python 3.5.2 (:issue:`21078`)
- Bug in :class:`Timedelta`: where passing a float with a unit would prematurely round the float precision (:issue:`14156`)
- Bug in :func:`pandas.testing.assert_index_equal` which raised ``AssertionError`` incorrectly, when comparing two :class:`CategoricalIndex` objects with param ``check_categorical=False`` (:issue:`19776`)
**Sparse**
- Bug in :attr:`SparseArray.shape` which previously only returned the shape :attr:`SparseArray.sp_values` (:issue:`21126`)
**Indexing**
- Bug in :meth:`Series.reset_index` where appropriate error was not raised with an invalid level name (:issue:`20925`)
- Bug in :func:`interval_range` when ``start``/``periods`` or ``end``/``periods`` are specified with float ``start`` or ``end`` (:issue:`21161`)
- Bug in :meth:`MultiIndex.set_names` where error raised for a ``MultiIndex`` with ``nlevels == 1`` (:issue:`21149`)
- Bug in :class:`IntervalIndex` constructors where creating an ``IntervalIndex`` from categorical data was not fully supported (:issue:`21243`, :issue:`21253`)
- Bug in :meth:`MultiIndex.sort_index` which was not guaranteed to sort correctly with ``level=1``; this was also causing data misalignment in particular :meth:`DataFrame.stack` operations (:issue:`20994`, :issue:`20945`, :issue:`21052`)
**Plotting**
- New keywords (sharex, sharey) to turn on/off sharing of x/y-axis by subplots generated with pandas.DataFrame().groupby().boxplot() (:issue:`20968`)
**I/O**
- Bug in IO methods specifying ``compression='zip'`` which produced uncompressed zip archives (:issue:`17778`, :issue:`21144`)
- Bug in :meth:`DataFrame.to_stata` which prevented exporting DataFrames to buffers and most file-like objects (:issue:`21041`)
- Bug in :meth:`read_stata` and :class:`StataReader` which did not correctly decode utf-8 strings on Python 3 from Stata 14 files (dta version 118) (:issue:`21244`)
- Bug in IO JSON :func:`read_json` reading empty JSON schema with ``orient='table'`` back to :class:`DataFrame` caused an error (:issue:`21287`)
**Reshaping**
- Bug in :func:`concat` where error was raised in concatenating :class:`Series` with numpy scalar and tuple names (:issue:`21015`)
- Bug in :func:`concat` warning message providing the wrong guidance for future behavior (:issue:`21101`)
**Other**
- Tab completion on :class:`Index` in IPython no longer outputs deprecation warnings (:issue:`21125`)
- Bug preventing pandas being used on Windows without C++ redistributable installed (:issue:`21106`)