solus
Singleton types.
Decision gist · record as of 2026-08-14
Yes, if you need singleton behavior and want a lightweight, typed implementation. The package is stable, has no vulnerabilities, and low install friction. However, maintenance is dormant—no updates in over 900 days—so consider it only if the current feature set meets your needs and you're comfortable with no active support.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or above.
- Low install friction with a pure Python wheel.
- Maintenance is dormant—last release was 2024-02-26, over 900 days ago—but the package is marked stable and has no known vulnerabilities.
License · maintenance · safety
MIT (permissive) — MIT license permits unrestricted use, modification, and distribution with minimal restrictions, making it safe for both open-source and commercial projects.
last release 2024-02-26 (900 days) · last repo commit 2024-05-31 · 1 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 115,304 downloads/mo, #12,259 on PyPI
Alternatives
Verify before relying
pip install solus
from solus import Singleton
class MyService(Singleton):
pass
service = MyService() # thread-safe single instance- Whether thread-safety guarantees hold under all Python concurrency models (asyncio, threading, multiprocessing).
- Performance characteristics compared to alternative singleton implementations.
What it is and what it does
solus provides two singleton type classes—Singleton and UnsafeSingleton—that enforce the singleton pattern at the class level. Singleton creates thread-safe instances that can be safely instantiated from multiple threads, while UnsafeSingleton creates faster but non-thread-safe singletons intended for single-threaded contexts. You inherit from either class to make your class a singleton; subsequent instantiation attempts return the same instance.
The package depends only on named, a utility library for type annotations. It's a minimal, focused tool for developers who need singleton behavior without rolling their own implementation or pulling in a large framework. The library is typed and supports Python 3.8 through 3.12.
Use it for
- Enforce a single global logger or configuration manager instance across an application.
- Create thread-safe service objects that should only be instantiated once in a multi-threaded environment.
- Build a single-instance cache or connection pool that all parts of the code share.
- Implement a registry or factory that must exist as exactly one instance throughout the application lifecycle.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need singleton behavior and want a lightweight, typed implementation.
The package is stable, has no vulnerabilities, and low install friction. However, maintenance is dormant—no updates in over 900 days—so consider it only if the current feature set meets your needs and you're comfortable with no active support.
Install
solus on PyPI
Before you install
Low install friction with a pure Python wheel. Maintenance is dormant—last release was 2024-02-26, over 900 days ago—but the package is marked stable and has no known vulnerabilities.
Requires Python 3.8 or above.
License in practice
MIT license permits unrestricted use, modification, and distribution with minimal restrictions, making it safe for both open-source and commercial projects.
Quickstart
pip install solus
from solus import Singleton
class MyService(Singleton):
pass
service = MyService() # thread-safe single instanceVerify before relying
- Whether thread-safety guarantees hold under all Python concurrency models (asyncio, threading, multiprocessing).
- Performance characteristics compared to alternative singleton implementations.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.8 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagenamed |
| Maintenance | Dormant 900 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 115,304 / month, #12,259 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/StableIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Topic :: UtilitiesTyping :: Typed |
Evidence: solus-1.2.2-py3-none-any.whl
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