def pop( self, index=-1 ):
        ret = self[index]
        del self[index]
        return ret
Tag Node representing our idea of a reusable box. It can handle multiple
dataset/ETHPy150Open ipython/ipython-py3k/IPython/external/pyparsing/_pyparsing.py/ParseResults.pop--crossover with--dataset/ETHPy150Open ella/ella/ella/core/templatetags/core.py/do_box