pattern-singleton 1.2.0

Metaclass Singleton Pattern (supports Multi-thread).

Description

Singleton is a creational design pattern that lets you ensure that a class has only one instance, while providing a global access point to this instance. This implementation of Singleton Design Pattern is based on metaclass method.

• Free software: MIT license

• But I would appreciate a star on GitHub

Multithreaded

This method provide proper handling for multi-thread environment by closing public threading lock while creating instance of Singleton subclass.

Installation

Just use (No other package is needed):

$ pip install pattern-singleton

Example Usage

from pattern_singleton import Singleton


class Example(metaclass=Singleton):
    def __init__(self):
        self.variable = 1


if __name__ == '__main__':
    example_01 = Example()
    example_02 = Example()

    print(example_01.variable)  # displays 1
    print(example_02.variable)  # displays 1

    example_01.variable = 2     # changes value for every instance of Example class

    print(example_01.variable)  # displays 2
    print(example_02.variable)  # displays 2

Credits

This package was created by Marcin Mysliwiec with Cookiecutter and the audreyr/cookiecutter-pypackage project template.