Release notes for PyTables 3.3 series¶

Changes from 3.2.3.1 to 3.3.0¶

Single codebase Python 2 and 3 support (gh-493).
Internal Blosc version updated to 1.11.1 (closes gh-541).
Full BitShuffle support for new Blosc versions (>= 1.8).
It is now possible to remove all rows from a table.
It is now possible to read reference types by dereferencing them as numpy array of objects (closes gh-518 and gh-519). Thanks to Ehsan Azar.
Get rid of the -native compile flag (closes gh-503).
The default number of threads to run numexpr (MAX_NUMEXPR_THREADS) internally has been raised from 2 to 4. This is because we are in 2016 and 4 core configurations are becoming common.
In order to avoid locking issues when using PyTables concurrently in several process, MAX_BLOSC_THREADS has been set to 1 by default. If you are running PyTables in one single process, you may want to experiment if higher values (like 2 or 4) bring better performance for you.

On python 3 try ‘latin1’ encoding before ‘bytes’ encoding during unpickling of node attributes pickled on python 2. Better fix for gh-560.
Fixed Windows 32 and 64-bit builds.