def pop(self, key=-1):
    value = self._values[key]
    self.__delitem__(key)
    return value
Removes and returns an item at a given index. Similar to list.pop().
dataset/ETHPy150Open sklearn-theano/sklearn-theano/sklearn_theano/externals/google/protobuf/internal/containers.py/RepeatedCompositeFieldContainer.pop