def popitem(self):
            try:
                k, v = self.iteritems().next()
            except __HOLE__:
                raise KeyError, 'container is empty'
            del self[k]
            return (k, v)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/webob_0_9/webob/util/dictmixin.py/DictMixin.popitem