[Pytables-announce] ANN: PyTables 0.9.1 released

[Francesc A. <fa...@ca...>]

Announcing PyTables 0.9.1
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This release is mainly a maintenance version. In it, some bugs has
been fixed and a few improvements has been made. One important thing
is that chunk sizes in EArrays has been re-tuned to get much better
performance and compression rations. Besides, it has been tested
against the latest Python 2.4 and all tests units seems to pass fine.

Changes more in depth
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Improvements:

=2D The chunksize computation for EArrays has been re-tuned to allow
  better performance and *much* better compression rations.

=2D New --unpackshort and --quantize flags has been added to nctoh5
  script. --unpackshort unpack short integer variables to float
  variables using scale_factor and add_offset netCDF variable
  attributes. --quantize quantize data to improve compression using
  least_significant_digit netCDF variable attribute (not active by
  default).  See
  http://www.cdc.noaa.gov/cdc/conventions/cdc_netcdf_standard.shtml
  for further explanation of what this attribute means. Thanks to Jeff
  Whitaker for providing this.

=2D Table.itersequence has received a new parameter called "sort". This
  allows to disable the sorting of the sequence in case the user wants
  so.

Backward-incompatible changes:

=2D Now, the AttributeSet class throw an AttributeError on __getattr__
  for nonexistent attributes in it. Formerly, the routine returned
  None, which is pretty much against convention in Python and breaks
  the built-in hasattr() function. Thanks to Robert Nemec for noting
  this and offering a patch.

=2D VLArray.read() has changed its behaviour. Now, it always returns a
  list, as stated in documentation, even when the number of elements
  to return is 0 or 1. This is much more consistent when representing
  the actual number of elements on a certain VLArray row.

API additions:

=2D A Row.getTable() has been added. It is an accessor for the associated
  Table object.

=2D A File.copyAttrs() has been added. It allows copying attributes from
  one leaf to other. Properly speaking, this was already there, but not
  documented :-/

Bug fixes:

=2D Now, the copy of hierarchies works even when there are scalar Arrays
  (i.e. Arrays which shape is ()) on it. Thanks to Robert Nemec for
  providing a patch.

=2D Solved a memory leak regarding the Filters instance associated with
  the File object, that was not released after closing the file. Now,
  there are no known leaks on PyTables itself.

=2D Fixed a bug in Table.append() when the table was indexed. The problem
  was that if table was in auto-indexing mode, some rows were lost in
  the indexation process and hence, not indexed correctly.

=2D Improved security of nodes name checking. Closes #1074335


Share your experience
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Let me know of any bugs, suggestions, gripes, kudos, etc. you may
have.

Enjoy data!

=2D-=20
=46rancesc Altet
Who's your data daddy? =A0PyTables