zope.viewlet
Zope Viewlets
Decision gist · record as of 2026-08-14
Yes, if you are building within the Zope ecosystem and need pluggable UI composition. The package is stable (Production/Stable status), has no known vulnerabilities, and supports current Python versions. However, the aging maintenance status (336 days since release) and the unclear license treatment warrant verification before adoption in new projects. Most useful for existing Zope applications; less relevant outside that framework.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.9 or later; depends on 13 zope.* packages that must be installed.
- Low install friction with a pure-wheel distribution.
- Maintenance status is aging—last release was 336 days ago—but the repository remains active with a recent commit in February 2026 and no archived status.
License · maintenance · safety
ZPL-2.1 (unclear) — Licensed under ZPL-2.1 (Zope Public License); license treatment is marked unclear in the fact sheet, so the specific obligations for redistribution or modification should be verified before use in proprietary or GPL-compatible contexts.
last release 2025-09-12 (336 days) · last repo commit 2026-02-04 · 2 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 128,534 downloads/mo, #11,703 on PyPI
Alternatives
Verify before relying
pip install zope.viewlet
from zope.viewlet.manager import ViewletManager
from zope.viewlet.viewlet import ViewletBase
class MyViewlet(ViewletBase):
pass- Whether ZPL-2.1 is compatible with your project's license requirements (treatment marked unclear).
- Real-world usage patterns and community adoption beyond the 128k monthly downloads figure.
- Whether the aging maintenance status (336 days since last release) poses a risk for your use case.
What it is and what it does
zope.viewlet is a framework for building pluggable web user interfaces within the Zope ecosystem. It extends zope.contentprovider by introducing viewlet managers—named template regions—and viewlets, which are discrete content pieces that can be registered and inserted into those regions dynamically. This allows developers to build modular, extensible interfaces where different parts of the UI can be contributed independently without modifying the core template.
The package is part of the Zope foundation's component architecture and integrates with zope.configuration, zope.interface, and zope.security to provide a declarative, adapter-based system for UI composition. It supports Python 3.9 through 3.13 and PyPy, and carries a long history of stable releases dating back to 2007. The framework is most useful in large Zope-based applications where UI modularity and plugin-like extensibility are design requirements.
Use it for
- Build modular web interfaces in Zope applications where different teams contribute UI regions independently.
- Create pluggable template regions that can be extended without modifying the base template.
- Implement conditional or weighted viewlet rendering for complex multi-tenant or role-based UIs.
- Integrate reusable UI components across a Zope-based CMS or portal system.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are building within the Zope ecosystem and need pluggable UI composition.
The package is stable (Production/Stable status), has no known vulnerabilities, and supports current Python versions. However, the aging maintenance status (336 days since release) and the unclear license treatment warrant verification before adoption in new projects. Most useful for existing Zope applications; less relevant outside that framework.
Install
zope-viewlet on PyPI
Before you install
Low install friction with a pure-wheel distribution. Maintenance status is aging—last release was 336 days ago—but the repository remains active with a recent commit in February 2026 and no archived status.
Requires Python 3.9 or later; depends on 13 zope.* packages that must be installed.
License in practice
Licensed under ZPL-2.1 (Zope Public License); license treatment is marked unclear in the fact sheet, so the specific obligations for redistribution or modification should be verified before use in proprietary or GPL-compatible contexts.
Quickstart
pip install zope.viewlet
from zope.viewlet.manager import ViewletManager
from zope.viewlet.viewlet import ViewletBase
class MyViewlet(ViewletBase):
passVerify before relying
- Whether ZPL-2.1 is compatible with your project's license requirements (treatment marked unclear).
- Real-world usage patterns and community adoption beyond the 128k monthly downloads figure.
- Whether the aging maintenance status (336 days since last release) poses a risk for your use case.
Package facts
| License | ZPL-2.1 unclear |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 13 packagessetuptoolszope.browserpagezope.componentzope.configurationzope.contentproviderzope.eventzope.i18nmessageidzope.interfacezope.locationzope.publisherzope.schemazope.securityzope.traversing |
| Maintenance | Aging 336 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 128,534 / month, #11,703 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: Web EnvironmentFramework :: Zope :: 3Intended Audience :: DevelopersLicense :: OSI Approved :: Zope Public LicenseNatural Language :: EnglishOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: Internet :: WWW/HTTP |
Evidence: zope_viewlet-6.0-py3-none-any.whl
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See also zope.browserpage · zope.contentprovider · zope.globalrequest · zope.ptresource · zope.browsermenu · zope.configuration · zope.pagetemplate · zope.browserresource · zope.tal · zope.browser