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DOC: whatsnew changes
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doc/source/v0.13.0.txt

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@@ -107,7 +107,7 @@ Indexing API Changes
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~~~~~~~~~~~~~~~~~~~~
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Prior to 0.13, it was impossible to use a label indexer (``.loc/.ix``) to set a value that
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was not contained in the index of a particular axis. (:issue:`2578`). See more :ref:`here<indexing.basics.partial_setting>`
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was not contained in the index of a particular axis. (:issue:`2578`). See more :ref:`the docs<indexing.basics.partial_setting>`
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In the ``Series`` case this is effectively an appending operation
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@@ -272,7 +272,7 @@ HDFStore API Changes
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- Significant table writing performance improvements
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- handle a passed ``Series`` in table format (:issue:`4330`)
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- can now serialize a ``timedelta64[ns]`` dtype in a table (:issue:`3577`), See :ref:`here for an example<io.hdf5-timedelta>`.
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- can now serialize a ``timedelta64[ns]`` dtype in a table (:issue:`3577`), See :ref:`the docs<io.hdf5-timedelta>`.
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- added an ``is_open`` property to indicate if the underlying file handle is_open;
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a closed store will now report 'CLOSED' when viewing the store (rather than raising an error)
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(:issue:`4409`)
@@ -310,7 +310,7 @@ HDFStore API Changes
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- removed the ``warn`` argument from ``open``. Instead a ``PossibleDataLossError`` exception will
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be raised if you try to use ``mode='w'`` with an OPEN file handle (:issue:`4367`)
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- allow a passed locations array or mask as a ``where`` condition (:issue:`4467`).
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See :ref:`here<io.hdf5-where_mask>` for an example.
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See :ref:`the docs<io.hdf5-where_mask>` for an example.
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- add the keyword ``dropna=True`` to ``append`` to change whether ALL nan rows are not written
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to the store (default is ``True``, ALL nan rows are NOT written), also settable
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via the option ``io.hdf.dropna_table`` (:issue:`4625`)
@@ -339,7 +339,7 @@ Enhancements
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get_dummies([1, 2, np.nan], dummy_na=True)
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- ``timedelta64[ns]`` operations. See :ref:`here<timeseries.timedeltas_convert>` for the docs.
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- ``timedelta64[ns]`` operations. See :ref:`the docs<timeseries.timedeltas_convert>` for the docs.
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.. warning::
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@@ -358,7 +358,7 @@ Enhancements
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A Series of dtype ``timedelta64[ns]`` can now be divided by another
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``timedelta64[ns]`` object to yield a ``float64`` dtyped Series. This
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is frequency conversion. See :ref:`here<timeseries.timedeltas_convert>` for the docs.
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is frequency conversion. See :ref:`the docs<timeseries.timedeltas_convert>` for the docs.
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.. ipython:: python
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@@ -476,7 +476,9 @@ Enhancements
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t = Timestamp('20130101 09:01:02')
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t + pd.datetools.Nano(123)
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- A new method, ``isin`` for DataFrames, plays nicely with boolean indexing. To get the rows where any of the conditions are met:
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- A new method, ``isin`` for DataFrames, plays nicely with boolean indexing. See :ref:`the docs<indexing.basics.indexing_isin>` for more.
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To get the rows where any of the conditions are met:
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.. ipython:: python
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@@ -486,8 +488,6 @@ Enhancements
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mask
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dfi[mask.any(1)]
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:ref:`See the docs<indexing.basics.indexing_isin>` for more.
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- ``Series`` now supports a ``to_frame`` method to convert it to a single-column DataFrame (:issue:`5164`)
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- All R datasets listed here http://stat.ethz.ch/R-manual/R-devel/library/datasets/html/00Index.html can now be loaded into Pandas objects
@@ -498,12 +498,12 @@ Enhancements
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com.load_data('Titanic')
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- ``tz_localize`` can infer a fall daylight savings transition based on the structure
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of the unlocalized data (:issue:`4230`), see :ref:`here<timeseries.timezone>`
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of the unlocalized data (:issue:`4230`), see :ref:`the docs<timeseries.timezone>`
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- DatetimeIndex is now in the API documentation, see :ref:`here<api.datetimeindex>`
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- DatetimeIndex is now in the API documentation, see :ref:`the docs<api.datetimeindex>`
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- :meth:`~pandas.io.json.json_normalize` is a new method to allow you to create a flat table
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from semi-structured JSON data. :ref:`See the docs<io.json_normalize>` (:issue:`1067`)
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from semi-structured JSON data. See :ref:`the docs<io.json_normalize>` (:issue:`1067`)
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- Added PySide support for the qtpandas DataFrameModel and DataFrameWidget.
@@ -517,11 +517,10 @@ Enhancements
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df.interpolate()
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Additionally, the ``method`` argument to ``interpolate`` has been expanded
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to include 'nearest', 'zero', 'slinear', 'quadratic', 'cubic',
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'barycentric', 'krogh', 'piecewise_polynomial', 'pchip' or "polynomial" or 'spline'
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and an integer representing the degree or order of the approximation. The new methods
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require scipy_. Consult the Scipy reference guide_ and documentation_ for more information
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about when the various methods are appropriate. See :ref:`the docs<missing_data.interpolate>`.
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to include ``'nearest', 'zero', 'slinear', 'quadratic', 'cubic',
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'barycentric', 'krogh', 'piecewise_polynomial', 'pchip', `polynomial`, 'spline'``
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The new methods require scipy_. Consult the Scipy reference guide_ and documentation_ for more information
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about when the various methods are appropriate. See :ref:`the docs<missing_data.interpolate>`.
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Interpolate now also accepts a ``limit`` keyword argument.
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This works similar to ``fillna``'s limit:
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# pure Python evaluation
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%timeit df1 + df2 + df3 + df4
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For more details, see the :ref:`enhancing performance documentation on eval
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<enhancingperf.eval>`
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For more details, see the :ref:`the docs<enhancingperf.eval>`
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- Similar to ``pandas.eval``, :class:`~pandas.DataFrame` has a new
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``DataFrame.eval`` method that evaluates an expression in the context of
@@ -614,11 +612,10 @@ Experimental
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df.query('a < b < c')
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selects all the rows of ``df`` where ``a < b < c`` evaluates to ``True``.
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For more details see the :ref:`indexing documentation on query
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<indexing.query>`.
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For more details see the :ref:`the docs<indexing.query>`.
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- ``pd.read_msgpack()`` and ``pd.to_msgpack()`` are now a supported method of serialization
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of arbitrary pandas (and python objects) in a lightweight portable binary format. :ref:`See the docs<io.msgpack>`
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of arbitrary pandas (and python objects) in a lightweight portable binary format. See :ref:`the docs<io.msgpack>`
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.. warning::
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