MultiMapping
Special MultiMapping objects used in Zope.
Decision gist · record as of 2026-08-14
Yes, if you are working with Zope or ZRDB and need its multi-level mapping behavior. No, if you are not already in the Zope ecosystem—standard Python dictionaries or ChainMap cover most use cases. The package is actively maintained, has no known vulnerabilities, and installs cleanly, but its utility is narrow and domain-specific.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low install friction with a pure-Python wheel.
- Actively maintained as of 2026-01-23 with recent Python version support (3.10–3.14).
License · maintenance · safety
ZPL-2.1 (unclear) — Licensed under ZPL-2.1 with unclear treatment classification. Review the license terms if you have specific compliance requirements before adopting.
last release 2026-01-23 (203 days) · last repo commit 2026-03-19
0 known vulnerabilities (OSV.dev, 2026-08-14) · 130,367 downloads/mo, #11,644 on PyPI
Alternatives
Verify before relying
pip install MultiMapping
from MultiMapping import MultiMapping
mm = MultiMapping([{'a': 1}, {'b': 2}])
print(mm['a']) # accesses first mapping- Whether MultiMapping is necessary for typical Zope applications or only for advanced ZRDB use cases.
- Performance characteristics when layering many mappings or with large dictionaries.
- Real-world usage patterns outside the Zope framework ecosystem.
What it is and what it does
MultiMapping is a specialized data structure from the Zope ecosystem that implements multi-level dictionary-like objects. It allows you to stack multiple mappings and look up keys across them in order, with fallback to the next layer if a key is not found. The package is mature (first released in 2010) and is primarily used internally by Zope components like ZRDB for managing layered configuration or request-scoped data.
The package depends only on ExtensionClass and is available as a pure-Python wheel, making installation straightforward. It supports modern Python versions (3.10–3.14) and both CPython and PyPy. Unless you are working directly with Zope internals or ZRDB, you are unlikely to need this package directly—it is typically pulled in as a transitive dependency of larger Zope applications.
Use it for
- Building layered configuration systems where keys resolve through multiple fallback dictionaries.
- Implementing request-scoped variable lookup in Zope web applications.
- Supporting ZRDB database query parameter resolution with multiple scopes.
- Creating namespace hierarchies where inner scopes shadow outer ones.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are working with Zope or ZRDB and need its multi-level mapping behavior.
No, if you are not already in the Zope ecosystem—standard Python dictionaries or ChainMap cover most use cases. The package is actively maintained, has no known vulnerabilities, and installs cleanly, but its utility is narrow and domain-specific.
Install
multimapping on PyPI
Before you install
Low install friction with a pure-Python wheel. Actively maintained as of 2026-01-23 with recent Python version support (3.10–3.14). Single dependency on ExtensionClass.
Requires Python 3.10 or later.
License in practice
Licensed under ZPL-2.1 with unclear treatment classification. Review the license terms if you have specific compliance requirements before adopting.
Quickstart
pip install MultiMapping
from MultiMapping import MultiMapping
mm = MultiMapping([{'a': 1}, {'b': 2}])
print(mm['a']) # accesses first mappingVerify before relying
- Whether MultiMapping is necessary for typical Zope applications or only for advanced ZRDB use cases.
- Performance characteristics when layering many mappings or with large dictionaries.
- Real-world usage patterns outside the Zope framework ecosystem.
Package facts
| License | ZPL-2.1 unclear |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageExtensionClass |
| Maintenance | Actively maintained 203 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 130,367 / month, #11,644 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 :: Zope :: 5Operating 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 :: 3.14Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPy |
Evidence: multimapping-5.1-py3-none-any.whl
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