def list_strings(arg):

    if isinstance(arg,str): return [arg]
    else: return arg
Are we the top manager group?
dataset/ETHPy150Open ipython/ipython-py3k/IPython/utils/text.py/list_strings--crossover with--dataset/ETHPy150Open jorgecarleitao/pyglet-gui/pyglet_gui/manager.py/ViewerManagerGroup.is_on_top