CHANGES.rst

Changes

5.0.0 (unreleased)

• Make an internal singleton object returned by APIs like implementedBy and directlyProvidedBy immutable. Previously, it was fully mutable and allowed changing its __bases___. That could potentially lead to wrong results in pathological corner cases. See issue 158.
• Support the PURE_PYTHON environment variable at runtime instead of just at wheel build time. A value of 0 forces the C extensions to be used (even on PyPy) failing if they aren't present. Any other value forces the Python implementation to be used, ignoring the C extensions. See PR 151.
• Cache the result of __hash__ method in InterfaceClass as a speed optimization. The method is called very often (i.e several hundred thousand times during Plone 5.2 startup). Because the hash value never changes it can be cached. This improves test performance from 0.614s down to 0.575s (1.07x faster). In a real world Plone case a reindex index came down from 402s to 320s (1.26x faster). See PR 156.
• Change the C classes SpecificationBase and its subclass ClassProvidesBase to store implementation attributes in their structures instead of their instance dictionaries. This eliminates the use of an undocumented private C API function, and helps make some instances require less memory. See PR 154.

• Reduce memory usage in other ways based on observations of usage patterns in Zope (3) and Plone code bases.

  • Specifications with no dependents are common (more than 50%) so avoid allocating a WeakKeyDictionary unless we need it.
  • Likewise, tagged values are relatively rare, so don't allocate a dictionary to hold them until they are used.
  • Use __slots___ or the C equivalent tp_members in more common places. Note that this removes the ability to set arbitrary instance variables on certain objects. See PR 155.

  The changes in this release resulted in a 7% memory reduction after loading about 6,000 modules that define about 2,200 interfaces.

• Remove support for hashing uninitialized interfaces. This could only be done by subclassing InterfaceClass. This has generated a warning since it was first added in 2011 (3.6.5). Please call the InterfaceClass constructor or otherwise set the appropriate fields in your subclass before attempting to hash or sort it. See issue 157.
• Remove unneeded override of the __hash__ method from zope.interface.declarations.Implements. Watching a reindex index process in ZCatalog with on a Py-Spy after 10k samples the time for .adapter._lookup was reduced from 27.5s to 18.8s (~1.5x faster). Overall reindex index time shrunk from 369s to 293s (1.26x faster). See PR 161.
• Make the Python implementation closer to the C implementation by ignoring all exceptions, not just AttributeError, during (parts of) interface adaptation. See issue 163.
• Micro-optimization in .adapter._lookup , .adapter._lookupAll and .adapter._subscriptions: By loading components.get into a local variable before entering the loop a bytcode "LOAD_FAST 0 (components)" in the loop can be eliminated. In Plone, while running all tests, average speedup of the "owntime" of _lookup is ~5x. See PR 167.
• Add __all__ declarations to all modules. This helps tools that do auto-completion and documentation and results in less cluttered results. Wildcard ("*") are not recommended and may be affected. See issue 153.
• Fix verifyClass and verifyObject for builtin types like dict that have methods taking an optional, unnamed argument with no default value like dict.pop. On PyPy3, the verification is strict, but on PyPy2 (as on all versions of CPython) those methods cannot be verified and are ignored. See issue 118.
• Update the common interfaces IEnumerableMapping, IExtendedReadMapping, IExtendedWriteMapping, IReadSequence and IUniqueMemberWriteSequence to no longer require methods that were removed from Python 3 on Python 3, such as __setslice___. Now, dict, list and tuple properly verify as IFullMapping, ISequence and IReadSequence, respectively on all versions of Python.
• Add human-readable __str___ and __repr___ to Attribute and Method. These contain the name of the defining interface and the attribute. For methods, it also includes the signature.

• Change the error strings raised by verifyObject and verifyClass. They now include more human-readable information and exclude extraneous lines and spaces. See issue 170.

  Caution

  This will break consumers (such as doctests) that depended on the exact error messages.

• Make verifyObject and verifyClass report all errors, if the candidate object has multiple detectable violations. Previously they reported only the first error. See issue.

  Like the above, this will break consumers depending on the exact output of error messages if more than one error is present.

4.7.1 (2019-11-11)

• Use Python 3 syntax in the documentation. See issue 119.

4.7.0 (2019-11-11)

• Drop support for Python 3.4.
• Fix queryTaggedValue, getTaggedValue, getTaggedValueTags subclass inheritance. See PR 144.
• Add support for Python 3.8.

4.6.0 (2018-10-23)

• Add support for Python 3.7
• Fix verifyObject for class objects with staticmethods on Python 3. See issue 126.

4.5.0 (2018-04-19)

• Drop support for 3.3, avoid accidental dependence breakage via setup.py. See PR 110.
• Allow registering and unregistering instance methods as listeners. See issue 12 and PR 102.
• Synchronize and simplify zope/__init__.py. See issue 114

4.4.3 (2017-09-22)

• Avoid exceptions when the __annotations__ attribute is added to interface definitions with Python 3.x type hints. See issue 98.
• Fix the possibility of a rare crash in the C extension when deallocating items. See issue 100.

4.4.2 (2017-06-14)

• Fix a regression storing zope.component.persistentregistry.PersistentRegistry instances. See issue 85.
• Fix a regression that could lead to the utility registration cache of Components getting out of sync. See issue 93.

4.4.1 (2017-05-13)

• Simplify the caching of utility-registration data. In addition to simplification, avoids spurious test failures when checking for leaks in tests with persistent registries. See pull 84.
• Raise ValueError when non-text names are passed to adapter registry methods: prevents corruption of lookup caches.

4.4.0 (2017-04-21)

• Avoid a warning from the C compiler. (#71)
• Add support for Python 3.6.

4.3.3 (2016-12-13)

• Correct typos and ReST formatting errors in documentation.
• Add API documentation for the adapter registry.
• Ensure that the LICENSE.txt file is included in built wheels.
• Fix C optimizations broken on Py3k. See the Python bug at: http://bugs.python.org/issue15657 (#60)

4.3.2 (2016-09-05)

• Fix equality testing of implementedBy objects and proxies. (#55)

4.3.1 (2016-08-31)

• Support Components subclasses that are not hashable. (#53)

4.3.0 (2016-08-31)

• Add the ability to sort the objects returned by implementedBy. This is compatible with the way interface classes sort so they can be used together in ordered containers like BTrees. (#42)
• Make setuptools a hard dependency of setup.py. (#13)
• Change a linear algorithm (O(n)) in Components.registerUtility and Components.unregisterUtility into a dictionary lookup (O(1)) for hashable components. This substantially improves the time taken to manipulate utilities in large registries at the cost of some additional memory usage. (#46)

4.2.0 (2016-06-10)

• Add support for Python 3.5
• Drop support for Python 2.6 and 3.2.

4.1.3 (2015-10-05)

• Fix installation without a C compiler on Python 3.5 (#24).

4.1.2 (2014-12-27)

• Add support for PyPy3.
• Remove unittest assertions deprecated in Python3.x.
• Add zope.interface.document.asReStructuredText, which formats the generated text for an interface using ReST double-backtick markers.

4.1.1 (2014-03-19)

• Add support for Python 3.4.

4.1.0 (2014-02-05)

• Update boostrap.py to version 2.2.
• Add @named(name) declaration, that specifies the component name, so it does not have to be passed in during registration.

4.0.5 (2013-02-28)

• Fix a bug where a decorated method caused false positive failures on verifyClass().

4.0.4 (2013-02-21)

• Fix a bug that was revealed by porting zope.traversing. During a loop, the loop body modified a weakref dict causing a RuntimeError error.

4.0.3 (2012-12-31)

• Fleshed out PyPI Trove classifiers.

4.0.2 (2012-11-21)

• Add support for Python 3.3.
• Restored ability to install the package in the absence of setuptools.
• LP #1055223: Fix test which depended on dictionary order and failed randomly in Python 3.3.

4.0.1 (2012-05-22)

• Drop explicit DeprecationWarnings for "class advice" APIS (these APIs are still deprecated under Python 2.x, and still raise an exception under Python 3.x, but no longer cause a warning to be emitted under Python 2.x).

4.0.0 (2012-05-16)

• Automated build of Sphinx HTML docs and running doctest snippets via tox.
• Deprecate the "class advice" APIs from zope.interface.declarations: implements, implementsOnly, and classProvides. In their place, prefer the equivalent class decorators: @implementer, @implementer_only, and @provider. Code which uses the deprecated APIs will not work as expected under Py3k.
• Remove use of '2to3' and associated fixers when installing under Py3k. The code is now in a "compatible subset" which supports Python 2.6, 2.7, and 3.2, including PyPy 1.8 (the version compatible with the 2.7 language spec).
• Drop explicit support for Python 2.4 / 2.5 / 3.1.
• Add support for PyPy.
• Add support for continuous integration using tox and jenkins.
• Add 'setup.py dev' alias (runs setup.py develop plus installs nose and coverage).
• Add 'setup.py docs' alias (installs Sphinx and dependencies).
• Replace all unittest coverage previously accomplished via doctests with unittests. The doctests have been moved into a docs section, managed as a Sphinx collection.
• LP #910987: Ensure that the semantics of the lookup method of zope.interface.adapter.LookupBase are the same in both the C and Python implementations.
• LP #900906: Avoid exceptions due to tne new __qualname__ attribute added in Python 3.3 (see PEP 3155 for rationale). Thanks to Antoine Pitrou for the patch.

3.8.0 (2011-09-22)

• New module zope.interface.registry. This is code moved from zope.component.registry which implements a basic nonperistent component registry as zope.interface.registry.Components. This class was moved from zope.component to make porting systems (such as Pyramid) that rely only on a basic component registry to Python 3 possible without needing to port the entirety of the zope.component package. Backwards compatibility import shims have been left behind in zope.component, so this change will not break any existing code.
• New tests_require dependency: zope.event to test events sent by Components implementation. The zope.interface package does not have a hard dependency on zope.event, but if zope.event is importable, it will send component registration events when methods of an instance of zope.interface.registry.Components are called.
• New interfaces added to support zope.interface.registry.Components addition: ComponentLookupError, Invalid, IObjectEvent, ObjectEvent, IComponentLookup, IRegistration, IUtilityRegistration, IAdapterRegistration, ISubscriptionAdapterRegistration, IHandlerRegistration, IRegistrationEvent, RegistrationEvent, IRegistered, Registered, IUnregistered, Unregistered, IComponentRegistry, and IComponents.
• No longer Python 2.4 compatible (tested under 2.5, 2.6, 2.7, and 3.2).

3.7.0 (2011-08-13)

• Move changes from 3.6.2 - 3.6.5 to a new 3.7.x release line.

3.6.7 (2011-08-20)

• Fix sporadic failures on x86-64 platforms in tests of rich comparisons of interfaces.

3.6.6 (2011-08-13)

• LP #570942: Now correctly compare interfaces from different modules but with the same names.

  N.B.: This is a less intrusive / destabilizing fix than the one applied in 3.6.3: we only fix the underlying cmp-alike function, rather than adding the other "rich comparison" functions.

• Revert to software as released with 3.6.1 for "stable" 3.6 release branch.

3.6.5 (2011-08-11)

• LP #811792: work around buggy behavior in some subclasses of zope.interface.interface.InterfaceClass, which invoke __hash__ before initializing __module__ and __name__. The workaround returns a fixed constant hash in such cases, and issues a UserWarning.
• LP #804832: Under PyPy, zope.interface should not build its C extension. Also, prevent attempting to build it under Jython.
• Add a tox.ini for easier xplatform testing.
• Fix testing deprecation warnings issued when tested under Py3K.

3.6.4 (2011-07-04)

• LP 804951: InterfaceClass instances were unhashable under Python 3.x.

3.6.3 (2011-05-26)

• LP #570942: Now correctly compare interfaces from different modules but with the same names.

3.6.2 (2011-05-17)

• Moved detailed documentation out-of-line from PyPI page, linking instead to http://docs.zope.org/zope.interface .
• Fixes for small issues when running tests under Python 3.2 using zope.testrunner.
• LP # 675064: Specify return value type for C optimizations module init under Python 3: undeclared value caused warnings, and segfaults on some 64 bit architectures.
• setup.py now raises RuntimeError if you don't have Distutils installed when running under Python 3.

3.6.1 (2010-05-03)

• A non-ASCII character in the changelog made 3.6.0 uninstallable on Python 3 systems with another default encoding than UTF-8.
• Fix compiler warnings under GCC 4.3.3.

3.6.0 (2010-04-29)

• LP #185974: Clear the cache used by Specificaton.get inside Specification.changed. Thanks to Jacob Holm for the patch.

• Add support for Python 3.1. Contributors:

  Lennart Regebro Martin v Loewis Thomas Lotze Wolfgang Schnerring

  The 3.1 support is completely backwards compatible. However, the implements syntax used under Python 2.X does not work under 3.X, since it depends on how metaclasses are implemented and this has changed. Instead it now supports a decorator syntax (also under Python 2.X):

  class Foo:
      implements(IFoo)
      ...

  can now also be written:

  @implementer(IFoo):
  class Foo:
      ...

  There are 2to3 fixers available to do this change automatically in the zope.fixers package.

• Python 2.3 is no longer supported.

3.5.4 (2009-12-23)

• Use the standard Python doctest module instead of zope.testing.doctest, which has been deprecated.

3.5.3 (2009-12-08)

• Fix an edge case: make providedBy() work when a class has '__provides__' in its __slots__ (see http://thread.gmane.org/gmane.comp.web.zope.devel/22490)

3.5.2 (2009-07-01)

• BaseAdapterRegistry.unregister, unsubscribe: Remove empty portions of the data structures when something is removed. This avoids leaving references to global objects (interfaces) that may be slated for removal from the calling application.

3.5.1 (2009-03-18)

• verifyObject: use getattr instead of hasattr to test for object attributes in order to let exceptions other than AttributeError raised by properties propagate to the caller
• Add Sphinx-based documentation building to the package buildout configuration. Use the bin/docs command after buildout.
• Improve package description a bit. Unify changelog entries formatting.
• Change package's mailing list address to zope-dev at zope.org as zope3-dev at zope.org is now retired.

3.5.0 (2008-10-26)

• Fix declaration of _zope_interface_coptimizations, it's not a top level package.
• Add a DocTestSuite for odd.py module, so their tests are run.
• Allow to bootstrap on Jython.
• Fix https://bugs.launchpad.net/zope3/3.3/+bug/98388: ISpecification was missing a declaration for __iro__.
• Add optional code optimizations support, which allows the building of C code optimizations to fail (Jython).
• Replace _flatten with a non-recursive implementation, effectively making it 3x faster.

3.4.1 (2007-10-02)

• Fix a setup bug that prevented installation from source on systems without setuptools.

3.4.0 (2007-07-19)

• Final release for 3.4.0.

3.4.0b3 (2007-05-22)

• When checking whether an object is already registered, use identity comparison, to allow adding registering with picky custom comparison methods.

3.3.0.1 (2007-01-03)

• Made a reference to OverflowWarning, which disappeared in Python 2.5, conditional.

3.3.0 (2007/01/03)

New Features

• Refactor the adapter-lookup algorithim to make it much simpler and faster.

  Also, implement more of the adapter-lookup logic in C, making debugging of application code easier, since there is less infrastructre code to step through.

• Treat objects without interface declarations as if they declared that they provide zope.interface.Interface.
• Add a number of richer new adapter-registration interfaces that provide greater control and introspection.
• Add a new interface decorator to zope.interface that allows the setting of tagged values on an interface at definition time (see zope.interface.taggedValue).

Bug Fixes

• A bug in multi-adapter lookup sometimes caused incorrect adapters to be returned.

3.2.0.2 (2006-04-15)

• Fix packaging bug: 'package_dir' must be a relative path.

3.2.0.1 (2006-04-14)

• Packaging change: suppress inclusion of 'setup.cfg' in 'sdist' builds.

3.2.0 (2006-01-05)

• Corresponds to the verison of the zope.interface package shipped as part of the Zope 3.2.0 release.

3.1.0 (2005-10-03)

• Corresponds to the verison of the zope.interface package shipped as part of the Zope 3.1.0 release.
• Made attribute resolution order consistent with component lookup order, i.e. new-style class MRO semantics.
• Deprecate 'isImplementedBy' and 'isImplementedByInstancesOf' APIs in favor of 'implementedBy' and 'providedBy'.

3.0.1 (2005-07-27)

• Corresponds to the verison of the zope.interface package shipped as part of the Zope X3.0.1 release.
• Fix a bug reported by James Knight, which caused adapter registries to fail occasionally to reflect declaration changes.

3.0.0 (2004-11-07)

• Corresponds to the verison of the zope.interface package shipped as part of the Zope X3.0.0 release.