code: def listify(obj, ignore=(list, tuple, type(None))):
      ''' Wraps all non-list or tuple objects in a list; provides a simple way
      to accept flexible arguments. '''
      return obj if isinstance(obj, ignore) else [objf listify(obj, ignore=(list, tuple, type(None))):
      ''' Wraps all non-list or tuple objects in a list; provides a simple way
      to accept flexible arguments. '''
      return obj if isinstance(obj, ignore) else [obj]
docs: Wraps all non-list or tuple objects in a list; provides a simple way
      to accept flexible arguments.