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# works in Python 2 & 3
class _Singleton(type):
_instances = {}
def __call__(self, *args, **kwargs):
if self not in self._instances:
self._instances[self] = \
super(_Singleton, self).__call__(*args, **kwargs)
return self._instances[self]
class Singleton(_Singleton("SingletonMeta", (object,), {})):
pass