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persistent 4.2.4

Translucent persistent objects

persistent: automatic persistence for Python objects

This package contains a generic persistence implementation for Python. It forms the core protocol for making objects interact “transparently” with a database such as the ZODB.

Please see the Sphinx documentation (docs/index.rst) for further information.


Use of this standalone persistent release is not recommended or supported with ZODB < 3.11. ZODB 3.10 and earlier bundle their own version of the persistent package.

persistent Changelog

4.2.4 (2017-03-20)

  • Avoid raising a SystemError: error return without exception set when loading an object with slots whose jar generates an exception (such as a ZODB POSKeyError) in setstate.

4.2.3 (2017-03-08)

  • Fix the hashcode of Python TimeStamp objects on 64-bit Python on Windows. See
  • Stop calling gc.collect every time PickleCache.incrgc is called (every transaction boundary) in pure-Python mode (PyPy). This means that the reported size of the cache may be wrong (until the next GC), but it is much faster. This should not have any observable effects for user code.
  • Stop clearing the dict and slots of objects added to PickleCache.new_ghost (typically these values are passed to __new__ from the pickle data) in pure-Python mode (PyPy). This matches the behaviour of the C code.
  • Add support for Python 3.6.
  • Fix __setstate__ interning when state parameter is not a built-in dict

4.2.2 (2016-11-29)

4.2.1 (2016-05-26)

  • Fix the hashcode of C TimeStamp objects on 64-bit Python 3 on Windows.

4.2.0 (2016-05-05)

  • Fixed the Python(/PYPY) implementation TimeStamp.timeTime method to have subsecond precision.
  • When testing PURE_PYTHON environments under tox, avoid poisoning the user’s global wheel cache.
  • Add support for Python 3.5.
  • Drop support for Python 2.6 and 3.2.

4.1.1 (2015-06-02)

  • Fix manifest and re-upload to fix stray files included in 4.1.0.

4.1.0 (2015-05-19)

  • Make the Python implementation of Persistent and PickleCache behave more similarly to the C implementation. In particular, the Python version can now run the complete ZODB and ZEO test suites.
  • Fix the hashcode of the Python TimeStamp on 32-bit platforms.

4.0.9 (2015-04-08)

  • Make the C and Python TimeStamp objects behave more alike. The Python version now produces the same repr and .raw() output as the C version, and has the same hashcode. In addition, the Python version is now supports ordering and equality like the C version.
  • Intern keys of object state in __setstate__ to reduce memory usage when unpickling multiple objects with the same attributes.
  • Add support for PyPy3.
  • 100% branch coverage.

4.0.8 (2014-03-20)

  • Add support for Python 3.4.
  • In pure-Python Persistent, avoid loading state in _p_activate for non-ghost objects (which could corrupt their state). (PR #9)
  • In pure-Python, and don’t throw POSKeyError if _p_activate is called on an object that has never been committed. (PR #9)
  • In pure-Python Persistent, avoid calling a subclass’s __setattr__ at instance creation time. (PR #8)
  • Make it possible to delete _p_jar / _p_oid of a pure-Python Persistent object which has been removed from the jar’s cache (fixes aborting a ZODB Connection that has added objects). (PR #7)

4.0.7 (2014-02-20)

  • Avoid a KeyError from _p_accessed() on newly-created objects under pure-Python: these objects may be assigned to a jar, but not yet added to its cache. (PR #6)
  • Avoid a failure in Persistent.__setstate__ when the state dict contains exactly two keys. (PR #5)
  • Fix a hang in picklecache invalidation if OIDs are manually passed out-of-order. (PR #4)
  • Add PURE_PYTHON environment variable support: if set, the C extensions will not be built, imported, or tested.

4.0.6 (2013-01-03)

  • Updated Trove classifiers.

4.0.5 (2012-12-14)

  • Fixed the C-extensions under Py3k (previously they compiled but were not importable).

4.0.4 (2012-12-11)

  • Added support for Python 3.3.
  • C extenstions now build under Python 3.2, passing the same tests as the pure-Python reference implementation.

4.0.3 (2012-11-19)

  • Fixed: In the C implimentation, an integer was compared with a pointer, with undefined results and a compiler warning.
  • Fixed: the Python implementation of the _p_estimated_size propety didn’t support deletion.
  • Simplified implementation of the _p_estimated_size property to only accept integers. A TypeError is raised if an incorrect type is provided.

4.0.2 (2012-08-27)

  • Correct initialization functions in renamed _timestamp extension.

4.0.1 (2012-08-26)

  • Worked around test failure due to overflow to long on 32-bit systems.

  • Renamed TimeStamp extension module to avoid clash with pure-Python timestamp module on case-insensitive filesystems.

    N.B: the canonical way to import the TimeStamp class is now:

    from persistent.timestamp import TimeStamp

    which will yield the class from the extension module (if available), falling back to the pure-Python reference implementation.

4.0.0 (2012-08-11)

Platform Changes

  • Added explicit support for Python 3.2 and PyPy.
    • Note that the C implementations of Persistent, PickleCache, and Timestamp are not built (yet) on these platforms.
  • Dropped support for Python < 2.6.

Testing Changes

  • 100% unit test coverage.
  • Removed all ZODB-dependent tests:
    • Rewrote some to avoid the dependency
    • Cloned the remainder into new ZODB.tests modules.
  • Refactored some doctests refactored as unittests.
  • Completed pure-Python reference implementations of ‘Persistent’, ‘PickleCache’, and ‘TimeStamp’.
  • All covered platforms tested under tox.
  • Added support for continuous integration using tox and jenkins.
  • Added dev alias (installs nose and coverage).
  • Dropped dependency on zope.testing / zope.testrunner: tests now run with test.

Documentation Changes

  • Refactored many Doctests as Sphinx documentation (snippets are exercised via ‘tox’).
  • Added docs alias (installs Sphinx and repoze.sphinx.autointerface).
File Type Py Version Uploaded on Size
persistent-4.2.4-cp27-cp27m-macosx_10_6_intel.whl (md5) Python Wheel cp27 2017-03-20 144KB
persistent-4.2.4-cp34-cp34m-macosx_10_6_intel.whl (md5) Python Wheel cp34 2017-03-20 145KB
persistent-4.2.4-cp35-cp35m-macosx_10_6_intel.whl (md5) Python Wheel cp35 2017-03-20 145KB
persistent-4.2.4-cp36-cp36m-macosx_10_6_intel.whl (md5) Python Wheel cp36 2017-03-20 145KB
persistent-4.2.4-py2.7-win-amd64.egg (md5) Python Egg 2.7 2017-03-20 189KB
persistent-4.2.4-py2.7-win32.egg (md5) Python Egg 2.7 2017-03-20 188KB
persistent-4.2.4-py3.3-win-amd64.egg (md5) Python Egg 3.3 2017-03-20 199KB
persistent-4.2.4-py3.3-win32.egg (md5) Python Egg 3.3 2017-03-20 198KB
persistent-4.2.4-py3.4-win-amd64.egg (md5) Python Egg 3.4 2017-03-20 195KB
persistent-4.2.4-py3.4-win32.egg (md5) Python Egg 3.4 2017-03-20 194KB
persistent-4.2.4.tar.gz (md5, pgp) Source 2017-03-20 94KB (md5) MS Windows installer 2.7 2017-03-20 344KB (md5) MS Windows installer 3.3 2017-03-20 343KB (md5) MS Windows installer 3.4 2017-03-20 343KB
persistent-4.2.4.win32-py2.7.exe (md5) MS Windows installer 2.7 2017-03-20 317KB
persistent-4.2.4.win32-py3.3.exe (md5) MS Windows installer 3.3 2017-03-20 312KB
persistent-4.2.4.win32-py3.4.exe (md5) MS Windows installer 3.4 2017-03-20 312KB