/usr/lib/python3/dist-packages/pyutilib/misc/singleton.py is in python3-pyutilib 5.3.5-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | # _________________________________________________________________________
#
# PyUtilib: A Python utility library.
# Copyright (c) 2008 Sandia Corporation.
# This software is distributed under the BSD License.
# Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
# the U.S. Government retains certain rights in this software.
# _________________________________________________________________________
class MonoState(object):
"""A class where every instance shares state."""
_state = {}
def __new__(cls, *p, **k):
self = object.__new__(cls, *p, **k)
self.__dict__ = cls._state
return self
class Singleton(object):
"""A class where the __new__() method returns the same instance."""
def __new__(cls, *p, **k):
if not '_the_instance' in cls.__dict__:
cls._the_instance = object.__new__(cls)
return cls._the_instance
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