<commit_before>.. _whatsnew_0900:

v0.9.0 (September 25, 2012)
---------------------------

This is a major release from 0.8.1 and includes several new features and
enhancements along with a large number of bug fixes. New features include
vectorized unicode encoding/decoding for `Series.str`, `to_latex` method to
DataFrame, more flexible parsing of boolean values, and enabling the download of
options data from Yahoo! Finance.

New features
~~~~~~~~~~~~

  - Add ``encode`` and ``decode`` for unicode handling to :ref:`vectorized
    string processing methods <basics.string_methods>` in Series.str  (GH1706_)
  - Add ``DataFrame.to_latex`` method (GH1735_)
  - Add convenient expanding window equivalents of all rolling_* ops (GH1785_)
  - Add Options class to pandas.io.data for fetching options data from Yahoo!
    Finance (GH1748_, GH1739_)
  - More flexible parsing of boolean values (Yes, No, TRUE, FALSE, etc)
    (GH1691_, GH1295_)
  - Add ``level`` parameter to ``Series.reset_index``
  - ``TimeSeries.between_time`` can now select times across midnight (GH1871_)
  - Series constructor can now handle generator as input (GH1679_)
  - ``DataFrame.dropna`` can now take multiple axes (tuple/list) as input
    (GH924_)
  - Enable ``skip_footer`` parameter in ``ExcelFile.parse`` (GH1843_)

API changes
~~~~~~~~~~~

  - Creating a Series from another Series, passing an index, will cause
    reindexing to happen inside rather than treating the Series like an
    ndarray. Technically improper usages like Series(df[col1], index=df[col2])
    that worked before "by accident" (this was never intended) will lead to all
    NA Series in some cases.
  - Deprecated ``day_of_year`` API removed from PeriodIndex, use ``dayofyear``
    (GH1723_)
  - Don't modify NumPy suppress printoption to True at import time
  - The internal HDF5 data arrangement for DataFrames has been transposed.
    Legacy files will still be readable by HDFStore (GH1834_, GH1824_)
  - Legacy cruft removed: pandas.stats.misc.quantileTS
  - Use ISO8601 format for Period repr: monthly, daily, and on down (GH1776_)
  - Empty DataFrame columns are now created as object dtype. This will prevent
    a class of TypeErrors that was occurring in code where the dtype of a
    column would depend on the presence of data or not (e.g. a SQL query having
    results) (GH1783_)
  - Setting parts of DataFrame/Panel using ix now aligns input Series/DataFrame
    (GH1630_)
  - ``first`` and ``last`` methods in ``GroupBy`` no longer drop non-numeric
    columns (GH1809_)
  - Resolved inconsistencies in specifying custom NA values in text parser.
    `na_values` of type dict no longer override default NAs unless
    `keep_default_na` is set to false explicitly (GH1657_)
  - DataFrame.dot will not do data alignment, and also work with Series
    (GH1915_)


See the `full release notes
<https://github.com/pydata/pandas/blob/master/RELEASE.rst>`__ or issue tracker
on GitHub for a complete list.

.. _GH1706: https://github.com/pydata/pandas/issues/1706
.. _GH1735: https://github.com/pydata/pandas/issues/1735
.. _GH1785: https://github.com/pydata/pandas/issues/1785
.. _GH1748: https://github.com/pydata/pandas/issues/1748
.. _GH1739: https://github.com/pydata/pandas/issues/1739
.. _GH1691: https://github.com/pydata/pandas/issues/1691
.. _GH1295: https://github.com/pydata/pandas/issues/1295
.. _GH1723: https://github.com/pydata/pandas/issues/1723
.. _GH1834: https://github.com/pydata/pandas/issues/1834
.. _GH1824: https://github.com/pydata/pandas/issues/1824
.. _GH1776: https://github.com/pydata/pandas/issues/1776
.. _GH1783: https://github.com/pydata/pandas/issues/1783
.. _GH1630: https://github.com/pydata/pandas/issues/1630
.. _GH1809: https://github.com/pydata/pandas/issues/1809
.. _GH1657: https://github.com/pydata/pandas/issues/1657
.. _GH1871: https://github.com/pydata/pandas/issues/1871
.. _GH1679: https://github.com/pydata/pandas/issues/1679
.. _GH1915: https://github.com/pydata/pandas/issues/1915
.. _GH924: https://github.com/pydata/pandas/issues/924
.. _GH1843: https://github.com/pydata/pandas/issues/1843
<commit_msg>DOC: fix up build errors in release notes<commit_after>.. _whatsnew_0900:

v0.9.0 (September 25, 2012)
---------------------------

This is a major release from 0.8.1 and includes several new features and
enhancements along with a large number of bug fixes. New features include
vectorized unicode encoding/decoding for `Series.str`, `to_latex` method to
DataFrame, more flexible parsing of boolean values, and enabling the download of
options data from Yahoo! Finance.

New features
~~~~~~~~~~~~

  - Add ``encode`` and ``decode`` for unicode handling to :ref:`vectorized
    string processing methods <basics.string_methods>` in Series.str  (GH1706_)
  - Add ``DataFrame.to_latex`` method (GH1735_)
  - Add convenient expanding window equivalents of all rolling_* ops (GH1785_)
  - Add Options class to pandas.io.data for fetching options data from Yahoo!
    Finance (GH1748_, GH1739_)
  - More flexible parsing of boolean values (Yes, No, TRUE, FALSE, etc)
    (GH1691_, GH1295_)
  - Add ``level`` parameter to ``Series.reset_index``
  - ``TimeSeries.between_time`` can now select times across midnight (GH1871_)
  - Series constructor can now handle generator as input (GH1679_)
  - ``DataFrame.dropna`` can now take multiple axes (tuple/list) as input
    (GH924_)
  - Enable ``skip_footer`` parameter in ``ExcelFile.parse`` (GH1843_)

API changes
~~~~~~~~~~~

  - Creating a Series from another Series, passing an index, will cause
    reindexing to happen inside rather than treating the Series like an
    ndarray. Technically improper usages like Series(df[col1], index=df[col2])
    that worked before "by accident" (this was never intended) will lead to all
    NA Series in some cases.
  - Deprecated ``day_of_year`` API removed from PeriodIndex, use ``dayofyear``
    (GH1723_)
  - Don't modify NumPy suppress printoption to True at import time
  - The internal HDF5 data arrangement for DataFrames has been transposed.
    Legacy files will still be readable by HDFStore (GH1834_, GH1824_)
  - Legacy cruft removed: pandas.stats.misc.quantileTS
  - Use ISO8601 format for Period repr: monthly, daily, and on down (GH1776_)
  - Empty DataFrame columns are now created as object dtype. This will prevent
    a class of TypeErrors that was occurring in code where the dtype of a
    column would depend on the presence of data or not (e.g. a SQL query having
    results) (GH1783_)
  - Setting parts of DataFrame/Panel using ix now aligns input Series/DataFrame
    (GH1630_)
  - ``first`` and ``last`` methods in ``GroupBy`` no longer drop non-numeric
    columns (GH1809_)
  - Resolved inconsistencies in specifying custom NA values in text parser.
    ``na_values`` of type dict no longer override default NAs unless
    ``keep_default_na`` is set to false explicitly (GH1657_)
  - ``DataFrame.dot`` will not do data alignment, and also work with Series
    (GH1915_)


See the `full release notes
<https://github.com/pydata/pandas/blob/master/RELEASE.rst>`__ or issue tracker
on GitHub for a complete list.

.. _GH1706: https://github.com/pydata/pandas/issues/1706
.. _GH1735: https://github.com/pydata/pandas/issues/1735
.. _GH1785: https://github.com/pydata/pandas/issues/1785
.. _GH1748: https://github.com/pydata/pandas/issues/1748
.. _GH1739: https://github.com/pydata/pandas/issues/1739
.. _GH1691: https://github.com/pydata/pandas/issues/1691
.. _GH1295: https://github.com/pydata/pandas/issues/1295
.. _GH1723: https://github.com/pydata/pandas/issues/1723
.. _GH1834: https://github.com/pydata/pandas/issues/1834
.. _GH1824: https://github.com/pydata/pandas/issues/1824
.. _GH1776: https://github.com/pydata/pandas/issues/1776
.. _GH1783: https://github.com/pydata/pandas/issues/1783
.. _GH1630: https://github.com/pydata/pandas/issues/1630
.. _GH1809: https://github.com/pydata/pandas/issues/1809
.. _GH1657: https://github.com/pydata/pandas/issues/1657
.. _GH1871: https://github.com/pydata/pandas/issues/1871
.. _GH1679: https://github.com/pydata/pandas/issues/1679
.. _GH1915: https://github.com/pydata/pandas/issues/1915
.. _GH924: https://github.com/pydata/pandas/issues/924
.. _GH1843: https://github.com/pydata/pandas/issues/1843

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