punq
An IOC Container for Python 3.10+
Decision gist · record as of 2026-08-14
Yes. Punq is actively maintained, has no known vulnerabilities, installs with minimal friction, and solves a real problem—dependency injection without magic or global state. The only caveat is the unclear license: verify the actual license terms before committing to a production dependency, but the library itself is sound and well-designed.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later (supports up to 3.15).
- Low install friction; single pure-Python wheel with only typing-extensions as a runtime dependency.
- Active maintenance with a release 42 days ago and last commit on 2026-08-14.
License · maintenance · safety
(unclear) — License treatment is unclear—no SPDX identifier or raw license text is recorded in the metadata. Verify the actual license before use in proprietary or restricted contexts.
last release 2026-07-03 (42 days) · last repo commit 2026-08-14 · 429 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 105,453 downloads/mo, #12,699 on PyPI
Alternatives
Verify before relying
pip install punq
import punq
container = punq.Container()
container.register("key", instance="value")
result = container.resolve("key")- Actual license terms—metadata shows no SPDX or raw license field despite active development.
What it is and what it does
Punq is a lightweight inversion-of-control container that manages object construction and dependency injection in Python applications. It lets you register service implementations against abstract types or keys, then resolve them on demand with automatic recursive dependency injection—all without global state, decorators, or unusual syntax. The library is designed to work cleanly with type checkers like mypy and pyright in strict mode.
You create a container at your application's entry point, register your services and their implementations, and then resolve them when needed. Punq handles nested dependencies automatically: if a registered class depends on another registered service, Punq injects it. You can register instances, classes, or provide constructor arguments at registration or resolution time. The library is small, well-tested, and intentionally simple to understand.
Use it for
- Wire up application services in a web framework or CLI tool without global state or service-locator antipatterns.
- Manage database connections, configuration readers, and other shared resources as singleton or transient instances.
- Test code by registering mock implementations of services without modifying production code.
- Build modular applications where components declare their dependencies through constructor parameters.
- Integrate with type checkers to catch missing or mismatched dependencies at development time.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Punq is actively maintained, has no known vulnerabilities, installs with minimal friction, and solves a real problem—dependency injection without magic or global state. The only caveat is the unclear license: verify the actual license terms before committing to a production dependency, but the library itself is sound and well-designed.
Install
punq on PyPI
Before you install
Low install friction; single pure-Python wheel with only typing-extensions as a runtime dependency. Active maintenance with a release 42 days ago and last commit on 2026-08-14.
Requires Python 3.10 or later (supports up to 3.15).
License in practice
License treatment is unclear—no SPDX identifier or raw license text is recorded in the metadata. Verify the actual license before use in proprietary or restricted contexts.
Quickstart
pip install punq
import punq
container = punq.Container()
container.register("key", instance="value")
result = container.resolve("key")Verify before relying
- Actual license terms—metadata shows no SPDX or raw license field despite active development.
Package facts
| License | Not declared unclear |
| Python support | Supports the current Python release <4.0,>=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagetyping-extensions |
| Maintenance | Actively maintained 42 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 105,453 / month, #12,699 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Intended Audience :: DevelopersProgramming 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 :: 3.15Topic :: Software Development :: Libraries :: Python Modules |
Evidence: punq-0.8.0-py3-none-any.whl
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