This module contains a class which can be used as a super class for all classes that need to implement the Singleton design pattern.
- class Singleton(*p, **k)
This class allows Singleton objects The __new__ method is overriden to force Singleton behaviour. The Singleton is created for the lowest subclass. Usage:
from taurus.core.util.singleton import Singleton class MyManager(Singleton): def init(self, *args, **kwargs): print("Singleton initialization")
>>> manager1 = MyManager() Singleton initialization >>> manager2 = MyManager() >>> print(manager1,manager2) <__main__.MyManager object at 0x9c2a0ec> <__main__.MyManager object at 0x9c2a0ec>
Notice that the two instances of manager point to the same object even though you tried to construct two instances of MyManager.
although __new__ is overriden __init__ is still being called for each instance=Singleton()