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Singleton class

/ Published in: Python
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  1. class Singleton(type):
  2.     """Singleton metaclass. Do NOT inherit!
  3.  
  4.     Usage:
  5.  
  6.     class MyClass(object):
  7.         __metaclass__ = Singleton
  8.         ...
  9.     """
  10.  
  11.     def __init__(mcs, name, bases, dic):
  12.         super(Singleton, mcs).__init__(name, bases, dic)
  13.         mcs.__instance = None
  14.  
  15.     def __call__(mcs, *args, **kw):
  16.         if mcs.__instance is None:
  17.             mcs.__instance = super(Singleton, mcs
  18.                                    ).__call__(*args, **kw)
  19.         return mcs.__instance

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