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What's new in PyTables 0.9.1
----------------------------
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. Besides, it has been tested against the latest Python 2.4
and all unit tests seems to pass fine.
More in detail:
Improvements:
- The chunksize computation for EArrays has been re-tuned to allow the
compression rations that were usual before 0.9 release.
- 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 https://www.ogc.org/standards/netcdf
for further explanation of what this attribute means. Thanks to Jeff
Whitaker for providing this.
- 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:
- 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.
- 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:
- A Row.getTable() has been added. It is an accessor for the associated
Table object.
- 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:
- 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.
- 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.
- Improved security of nodes name checking. Closes #1074335
Enjoy data!,
-- Francesc Altet
falted@pytables.org
|
