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<div class="section" id="what-s-new-in-pytables-0-9-1">
<h1>What’s new in PyTables 0.9.1<a class="headerlink" href="#what-s-new-in-pytables-0-9-1" title="Permalink to this headline">¶</a></h1>
<p>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.</p>
<p>More in detail:</p>
<p>Improvements:</p>
<ul class="simple">
<li>The chunksize computation for EArrays has been re-tuned to allow the
compression rations that were usual before 0.9 release.</li>
<li>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
<a class="reference external" href="http://www.esrl.noaa.gov/psd/data/gridded/conventions/cdc_netcdf_standard.shtml">http://www.esrl.noaa.gov/psd/data/gridded/conventions/cdc_netcdf_standard.shtml</a>
for further explanation of what this attribute means. Thanks to Jeff
Whitaker for providing this.</li>
<li>Table.itersequence has received a new parameter called “sort”. This
allows to disable the sorting of the sequence in case the user wants
so.</li>
</ul>
<p>Backward-incompatible changes:</p>
<ul class="simple">
<li>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.</li>
<li>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.</li>
</ul>
<p>API additions:</p>
<ul class="simple">
<li>A Row.getTable() has been added. It is an accessor for the associated
Table object.</li>
<li>A File.copyAttrs() has been added. It allows copying attributes from
one leaf to other. Properly speaking, this was already there, but not
documented :-/</li>
</ul>
<p>Bug fixes:</p>
<ul class="simple">
<li>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.</li>
<li>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.</li>
<li>Improved security of nodes name checking. Closes #1074335</li>
</ul>
<p>Enjoy data!,</p>
<p>– Francesc Altet
<a class="reference external" href="mailto:falted%40pytables.org">falted<span>@</span>pytables<span>.</span>org</a></p>
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