/ Published in: Python
The ASPN cookbook has many recipes for singletons in Python. So far, this one
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/412551
has been my favourite, because it is so simple and concise. However, I just ran into a brick wall when I tried to use it with a class that can be initialized with keyword arguments. This is my first draft for a solution to this problem. It's quick and dirty; please give it a glance and leave a comment if you find a problem.
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/412551
has been my favourite, because it is so simple and concise. However, I just ran into a brick wall when I tried to use it with a class that can be initialized with keyword arguments. This is my first draft for a solution to this problem. It's quick and dirty; please give it a glance and leave a comment if you find a problem.
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class Singleton(type): def __init__(self, *args, **kwds): type.__init__(self, *args, **kwds) self._instances = {} def __call__(self, *args, **kwds): sig = args + tuple(sorted(kwds.items())) if not sig in self._instances: self._instances[sig] = type.__call__(self, *args, **kwds) return self._instances[sig]