Registry / pysingleton

pysingleton

library0.2.1pypypi✓ verified 85d ago

A minimal Python library providing a @singleton decorator to turn classes into singletons. Version 0.2.1, released Oct 2014. It is in maintenance mode with rare updates.

pip install pysingleton

github ↗package ↗

INSTALL

IMPORT

SIG · PYSINGLETON

pysingleton

pythonv0.2.1

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

singleton

✓ from singleton import singleton

✗ from pysingleton import singleton

Apply @singleton to a class to ensure only one instance exists.

from pysingleton import singleton @singleton class MyClass: pass a = MyClass() b = MyClass() assert a is b print("Singleton works")

Debug

Known issues

gotchaLocking in __init__: The singleton decorator does not protect against concurrent instantiation. In multithreaded environments, __init__ may be called multiple times.

fix

Add a threading lock inside the class's __new__ method or use a thread-safe singleton pattern.

affects: all

gotchaSubclassing singletons: Subclassing a singleton class may lead to unexpected behavior. The subclass is not automatically a singleton.

fix

Avoid subclassing singletons; apply @singleton to each class individually.

affects: all

deprecatedPython 2 support: The library was built for Python 2 and may have compatibility issues with Python 3 (e.g., metaclass syntax).

fix

Use Python 3 compatible libraries like 'singledispatch' or custom metaclass for production code.

affects: 0.2.1

Upgrade

Version history

0.2.1latest on PyPI · released Apr 4, 2017

Audit

Dependencies

No dependency data recorded yet.

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/timofurrer/singleton ↗

packagehttps://pypi.org/project/pysingleton/ ↗