[SciPy-User] ANN: pandas 0.4.1 release

Wes McKinney wesmckinn@gmail....
Sun Sep 25 20:36:21 CDT 2011

I'm happy to announce the 0.4.1 pandas release, largely a bugfix
release with a handful of new features and speed optimizations. See
below or on GitHub for the full release notes. Binary installers are
on PyPI. Thanks to all for bug reports and pull requests.


Release Notes: https://github.com/wesm/pandas/blob/master/RELEASE.rst
Documentation: http://pandas.sourceforge.net
Installers: http://pypi.python.org/pypi/pandas
Code Repository: http://github.com/wesm/pandas
Mailing List: http://groups.google.com/group/pystatsmodels
Blog: http://blog.wesmckinney.com

pandas 0.4.1 Release Notes

**Release date:** 9/25/2011

This is primarily a bug fix release but includes some new features and

**New features / modules**

  - Added new `DataFrame` methods `get_dtype_counts` and property `dtypes`
  - Setting of values using ``.ix`` indexing attribute in mixed-type DataFrame
    objects has been implemented (fixes GH #135)
  - `read_csv` can read multiple columns into a `MultiIndex`. DataFrame's
    `to_csv` method will properly write out a `MultiIndex` which can be read
    back (PR #151, thanks to Skipper Seabold)
  - Wrote fast time series merging / joining methods in Cython. Will be
    integrated later into DataFrame.join and related functions
  - Added `ignore_index` option to `DataFrame.append` for combining unindexed
    records stored in a DataFrame

**Improvements to existing features**

  - Some speed enhancements with internal Index type-checking function
  - `DataFrame.rename` has a new `copy` parameter which can rename a DataFrame
    in place
  - Enable unstacking by level name (PR #142)
  - Enable sortlevel to work by level name (PR #141)
  - `read_csv` can automatically "sniff" other kinds of delimiters using
    `csv.Sniffer` (PR #146)
  - Improved speed of unit test suite by about 40%
  - Exception will not be raised calling `HDFStore.remove` on non-existent node
    with where clause
  - Optimized `_ensure_index` function resulting in performance savings in
    type-checking Index objects

**Bug fixes**

  - Fixed DataFrame constructor bug causing downstream problems (e.g. .copy()
    failing) when passing a Series as the values along with a column name and
  - Fixed single-key groupby on DataFrame with as_index=False (GH #160)
  - `Series.shift` was failing on integer Series (GH #154)
  - `unstack` methods were producing incorrect output in the case of duplicate
    hierarchical labels. An exception will now be raised (GH #147)
  - Calling `count` with level argument caused reduceat failure or segfault in
    earlier NumPy (GH #169)
  - Fixed `DataFrame.corrwith` to automatically exclude non-numeric data (GH
  - Unicode handling bug fixes in `DataFrame.to_string` (GH #138)
  - Excluding OLS degenerate unit test case that was causing platform specific
    failure (GH #149)
  - Skip blosc-dependent unit tests for PyTables < 2.2 (PR #137)
  - Calling `copy` on `DateRange` did not copy over attributes to the new object
    (GH #168)
  - Fix bug in `HDFStore` in which Panel data could be appended to a Table with
    different item order, thus resulting in an incorrect result read back

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