Persistence
Persistent ExtensionClass
Decision gist · record as of 2026-08-14
Yes, if you are building or maintaining Zope 5 applications that explicitly require ExtensionClass semantics for persistence. The package is actively maintained, has no known vulnerabilities, and supports current Python versions. No, if you are starting a new persistence layer outside Zope or can use persistent.Persistent instead—this is a specialized variant, not a general-purpose persistence tool. Verify the ZPL-2.1 license terms for your use case before committing.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python >=3.10; ExtensionClass dependency must be installed (pulled in automatically).
- Medium install friction due to compiled wheels for multiple Python versions and architectures.
- Actively maintained with recent releases; last commit 2026-08-14.
License · maintenance · safety
ZPL-2.1 (unclear) — Licensed under ZPL-2.1 (Zope Public License 2.1), but license treatment is marked unclear in the metadata—verify the actual license terms before use in proprietary or restricted-license projects.
last release 2025-11-16 (271 days) · last repo commit 2026-08-14 · 2 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 162,755 downloads/mo, #10,589 on PyPI
Alternatives
Verify before relying
pip install persistence
from persistence import Persistent
from ExtensionClass import Base
class MyPersistent(Persistent):
pass- Whether ZPL-2.1 classification as 'unclear' reflects ambiguity in the license itself or metadata gaps
- Specific use-case guidance beyond Zope framework integration
What it is and what it does
Persistence is a specialized variant of the persistent base class that leverages ExtensionClass semantics for object persistence in Zope environments. It enables objects to be serialized and stored, typically in a ZODB database, while maintaining the performance and behavioral characteristics of ExtensionClass-based inheritance. The package is mature (first released 2008) and actively maintained, with wheels built for modern Python versions across multiple platforms.
Unless your application specifically requires ExtensionClass semantics—such as tight integration with Zope framework components or legacy code that depends on ExtensionClass behavior—the package documentation recommends using persistent.Persistent from the persistent distribution instead. This package is a narrower, specialized tool for Zope-centric persistence patterns.
Use it for
- Building persistent object hierarchies in Zope 5 applications that require ExtensionClass semantics
- Integrating legacy Zope code that depends on ExtensionClass-based persistence
- Serializing and storing application state in ZODB with ExtensionClass inheritance patterns
- Extending Zope framework components that expect ExtensionClass-derived persistent objects
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are building or maintaining Zope 5 applications that explicitly require ExtensionClass semantics for persistence.
The package is actively maintained, has no known vulnerabilities, and supports current Python versions. No, if you are starting a new persistence layer outside Zope or can use persistent.Persistent instead—this is a specialized variant, not a general-purpose persistence tool. Verify the ZPL-2.1 license terms for your use case before committing.
Install
persistence on PyPI
Before you install
Medium install friction due to compiled wheels for multiple Python versions and architectures. Actively maintained with recent releases; last commit 2026-08-14. Supports Python 3.10–3.14 on CPython and PyPy.
Requires Python >=3.10; ExtensionClass dependency must be installed (pulled in automatically).
License in practice
Licensed under ZPL-2.1 (Zope Public License 2.1), but license treatment is marked unclear in the metadata—verify the actual license terms before use in proprietary or restricted-license projects.
Quickstart
pip install persistence
from persistence import Persistent
from ExtensionClass import Base
class MyPersistent(Persistent):
passVerify before relying
- Whether ZPL-2.1 classification as 'unclear' reflects ambiguity in the license itself or metadata gaps
- Specific use-case guidance beyond Zope framework integration
Package facts
| License | ZPL-2.1 unclear |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | 2 packagesExtensionClasspersistent |
| Maintenance | Actively maintained 271 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 162,755 / month, #10,589 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 6 - MatureEnvironment :: Web EnvironmentFramework :: ZopeFramework :: Zope :: 5Operating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPy |
Evidence: persistence-5.4-cp310-cp310-macosx_10_9_x86_64.whl; persistence-5.4-cp310-cp310-macosx_11_0_arm64.whl; persistence-5.4-cp310-cp310-manylinux1_i686.manylinux2014_i686.manylinux_2_17_i686.manylinux_2_5_i686.whl; persistence-5.4-cp310-cp310-manylinux1_x86_64.manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_5_x86_64.whl; persistence-5.4-cp310-cp310-manylinux2014_aarch64.manylinux_2_17_aarch64.whl; persistence-5.4-cp310-cp310-win_amd64.whl; persistence-5.4-cp311-cp311-macosx_10_9_x86_64.whl; persistence-5.4-cp311-cp311-macosx_11_0_arm64.whl; persistence-5.4-cp311-cp311-manylinux1_i686.manylinux2014_i686.manylinux_2_17_i686.manylinux_2_5_i686.whl; persistence-5.4-cp311-cp311-manylinux1_x86_64.manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_5_x86_64.whl; persistence-5.4-cp311-cp311-manylinux2014_aarch64.manylinux_2_17_aarch64.whl; persistence-5.4-cp311-cp311-win_amd64.whl; persistence-5.4-cp312-cp312-macosx_10_9_x86_64.whl; persistence-5.4-cp312-cp312-macosx_11_0_arm64.whl; persistence-5.4-cp312-cp312-manylinux1_i686.manylinux2014_i686.manylinux_2_17_i686.manylinux_2_5_i686.whl; persistence-5.4-cp312-cp312-manylinux1_x86_64.manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_5_x86_64.whl; persistence-5.4-cp312-cp312-manylinux2014_aarch64.manylinux_2_17_aarch64.whl; persistence-5.4-cp312-cp312-win_amd64.whl; persistence-5.4-cp313-cp313-macosx_10_9_x86_64.whl; persistence-5.4-cp313-cp313-macosx_11_0_arm64.whl
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See also ExtensionClass · zope.annotation · persistent · zope.container · Zope · zope.globalrequest · Acquisition · seba-sqlite · BTrees · ripser