mo-kwargs
Object destructuring of function parameters for Python!
Decision gist · record as of 2026-08-14
Yes, if you frequently work with parameter dictionaries from external sources and want to avoid boilerplate extraction or TypeError handling. The low install friction, active maintenance, and lack of security issues make it a safe choice. The MPL 2.0 copyleft license is a minor consideration only if you plan to modify and redistribute the package itself.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low friction: pure Python wheel with a single runtime dependency (mo-dots).
- Actively maintained as of March 2026, with a long release history since 2017.
License · maintenance · safety
MPL 2.0 (copyleft) — MPL 2.0 is a copyleft license; you must disclose source and license any modifications to this package, though it permits commercial use and does not require derivative works to adopt the same license.
last release 2026-03-02 (165 days) · last repo commit 2026-03-02 · 3 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 118,992 downloads/mo, #12,093 on PyPI
Alternatives
Verify before relying
from mo_kwargs import override
@override
def login(username, password=None):
return f"Logged in as {username}"
creds = {"username": "user", "password": "pass", "extra": "ignored"}
result = login(kwargs=creds)- Whether mo-dots adds meaningful install friction or is a lightweight utility dependency
- Real-world performance impact of the decorator on function call overhead
What it is and what it does
mo-kwargs is a decorator library that brings JavaScript-style object destructuring to Python function parameters. It provides an `@override` decorator that adds a `kwargs` parameter to decorated functions, allowing you to pass a dictionary of parameters that will be unpacked and merged with explicit arguments. Unlike `**kwargs`, this approach ignores extra keys in the dictionary instead of raising a TypeError, and allows explicit parameters to override values from the dictionary.
The primary use case is handling parameter sets from external sources—configuration files, APIs, or dynamic data structures—where you cannot control whether extra keys are present. The decorator ensures required parameters are still enforced, optional parameters get their defaults, and all parameters (used or not) are available in the `kwargs` dict if the function accepts it. It works with regular Python functions, instance methods, and class methods.
Use it for
- Load function parameters from a config file that may contain extra keys you don't need
- Overlay multiple parameter dictionaries with explicit overrides (e.g., base config + user overrides)
- Accept parameter bundles from external APIs without manually extracting each field
- Collect all parameters passed to a function in a single dict for logging or inspection
- Simplify function calls when parameters come from a dynamic source with unknown keys
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you frequently work with parameter dictionaries from external sources and want to avoid boilerplate extraction or TypeError handling.
The low install friction, active maintenance, and lack of security issues make it a safe choice. The MPL 2.0 copyleft license is a minor consideration only if you plan to modify and redistribute the package itself.
Install
mo-kwargs on PyPI
Before you install
Low friction: pure Python wheel with a single runtime dependency (mo-dots). Actively maintained as of March 2026, with a long release history since 2017.
License in practice
MPL 2.0 is a copyleft license; you must disclose source and license any modifications to this package, though it permits commercial use and does not require derivative works to adopt the same license.
Quickstart
from mo_kwargs import override
@override
def login(username, password=None):
return f"Logged in as {username}"
creds = {"username": "user", "password": "pass", "extra": "ignored"}
result = login(kwargs=creds)Verify before relying
- Whether mo-dots adds meaningful install friction or is a lightweight utility dependency
- Real-world performance impact of the decorator on function call overhead
Package facts
| License | MPL 2.0 copyleft |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagemo-dots |
| Maintenance | Actively maintained 165 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 118,992 / month, #12,093 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaLicense :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.15Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Topic :: Software Development :: LibrariesTopic :: Software Development :: Libraries :: Python Modules |
Evidence: mo_kwargs-8.703.26061-py3-none-any.whl
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See also overloading · overrides · mo-dots · wrapt · singleton-decorator · redo · undecorated · mo-parsing · mo-logs · mo-sql-parsing