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v0.22.0.txt
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.. _whatsnew_0220:
v0.22.0
-------
This is a major release from 0.21.1 and includes a number of API changes,
deprecations, new features, enhancements, and performance improvements along
with a large number of bug fixes. We recommend that all users upgrade to this
version.
.. _whatsnew_0220.enhancements:
New features
~~~~~~~~~~~~
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.. _whatsnew_0220.enhancements.other:
Other Enhancements
^^^^^^^^^^^^^^^^^^
- Better support for ``Dataframe.style.to_excel()`` output with the ``xlsxwriter`` engine. (:issue:`16149`)
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.. _whatsnew_0220.api_breaking:
Backwards incompatible API changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. _whatsnew_0220.api:
Other API Changes
^^^^^^^^^^^^^^^^^
- ``NaT`` division with :class:`datetime.timedelta` will now return ``NaN`` instead of raising (:issue:`17876`)
- All-NaN levels in ``MultiIndex`` are now assigned float rather than object dtype, coherently with flat indexes (:issue:`17929`).
- :class:`Timestamp` will no longer silently ignore unused or invalid `tz` or `tzinfo` keyword arguments (:issue:`17690`)
- :class:`Timestamp` will no longer silently ignore invalid `freq` arguments (:issue:`5168`)
- :class:`CacheableOffset` and :class:`WeekDay` are no longer available in the `tseries.offsets` module (:issue:`17830`)
.. _whatsnew_0220.deprecations:
Deprecations
~~~~~~~~~~~~
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.. _whatsnew_0220.prior_deprecations:
Removal of prior version deprecations/changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. _whatsnew_0220.performance:
Performance Improvements
~~~~~~~~~~~~~~~~~~~~~~~~
- Indexers on Series or DataFrame no longer create a reference cycle (:issue:`17956`)
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.. _whatsnew_0220.docs:
Documentation Changes
~~~~~~~~~~~~~~~~~~~~~
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.. _whatsnew_0220.bug_fixes:
Bug Fixes
~~~~~~~~~
- Bug in ``pd.read_msgpack()`` with a non existent file is passed in Python 2 (:issue:`15296`)
- Bug in ``DataFrame.groupby`` where key as tuple in a ``MultiIndex`` were interpreted as a list of keys (:issue:`17979`)
- .timestamp() unittests fail on python3 (:issue:`18037`)
Conversion
^^^^^^^^^^
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Indexing
^^^^^^^^
- Bug in :func:`PeriodIndex.truncate` which raises ``TypeError`` when ``PeriodIndex`` is monotonic (:issue:`17717`)
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I/O
^^^
- :func:`read_html` now rewinds seekable IO objects after parse failure, before attempting to parse with a new parser. If a parser errors and the object is non-seekable, an informative error is raised suggesting the use of a different parser (:issue:`17975`)
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Plotting
^^^^^^^^
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Groupby/Resample/Rolling
^^^^^^^^^^^^^^^^^^^^^^^^
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Sparse
^^^^^^
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Reshaping
^^^^^^^^^
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Numeric
^^^^^^^
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Categorical
^^^^^^^^^^^
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Other
^^^^^
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