/usr/lib/python3/dist-packages/aeidon/singleton.py is in python3-aeidon 0.24.3-1.
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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 26 27 28 29 30 31 32 | # -*- coding: utf-8 -*-
# Copyright (C) 2007 Osmo Salomaa
#
# This file is part of Gaupol.
#
# Gaupol is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# Gaupol is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# Gaupol. If not, see <http://www.gnu.org/licenses/>.
"""Base class for single-instance classes."""
__all__ = ("Singleton",)
class Singleton(object):
"""Base class for single-instance classes."""
def __new__(cls, *args, **kwargs):
"""Return possibly existing instance."""
if "_instance" not in cls.__dict__:
cls._instance = object.__new__(cls, *args, **kwargs)
return cls._instance
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