old_contents: #   Copyright 2011 Red Hat, Inc.
  #
  #   Licensed under the Apache License, Version 2.0 (the "License");
  #   you may not use this file except in compliance with the License.
  #   You may obtain a copy of the License at
  #
  #       http://www.apache.org/licenses/LICENSE-2.0
  #
  #   Unless required by applicable law or agreed to in writing, software
  #   distributed under the License is distributed on an "AS IS" BASIS,
  #   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  #   See the License for the specific language governing permissions and
  #   limitations under the License.
  
  class Singleton(object):
      _instance = None
  
      def __new__(cls, *args, **kwargs):
          if cls._instance is None:
              instance = super(Singleton, cls).__new__(cls, *args, **kwargs)
              instance._singleton_init(*args, **kwargs)
              cls._instance = instance
          elif args or kwargs:
              cls._instance.log.warn('Attempted re-initialize of singleton: %s' % (cls._instance, ))
          return cls._instance
  
      def __init__(self):
          pass
  
      def _singleton_init(self):
          """Initialize a singleton instance before it is registered."""
          pass
  
new_contents: #   Copyright 2011 Red Hat, Inc.
  #
  #   Licensed under the Apache License, Version 2.0 (the "License");
  #   you may not use this file except in compliance with the License.
  #   You may obtain a copy of the License at
  #
  #       http://www.apache.org/licenses/LICENSE-2.0
  #
  #   Unless required by applicable law or agreed to in writing, software
  #   distributed under the License is distributed on an "AS IS" BASIS,
  #   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  #   See the License for the specific language governing permissions and
  #   limitations under the License.
  
  class Singleton(object):
      _instance = None
  
      def __new__(cls, *args, **kwargs):
          if cls._instance is None:
              instance = super(Singleton, cls).__new__(cls, *args, **kwargs)
              instance._singleton_init(*args, **kwargs)
              cls._instance = instance
          elif args or kwargs:
              cls._instance.log.warn('Attempted re-initialize of singleton: %s' % (cls._instance, ))
          return cls._instance
  
      def __init__(self, *args, **kwargs):
          pass
  
      def _singleton_init(self, *args, **kwargs):
          """Initialize a singleton instance before it is registered."""
          pass
  
subject: Allow for parameters to __init__()