Singleton¶
This module provides a simple utility metaclass for creating singleton objects.
Usage¶
Using the Singleton metaclass to make the
desired class a singleton is very easy:
from frequent.singleton import Singleton
class MySingleton(object, metaclass=Singleton):
def __init__(self, x):
self.x = x
That’s all there is to it. Now the first call to MySingleton will create
(and store) the new object and subsequent calls will return the stored version:
>>> single = MySingleton(42)
>>> single.x
42
>>> other = MySingleton(0)
>>> other.x
42
>>> single.x = 0
>>> other.x
0
>>> other.x = 42
>>> single.x
42