def __repr__(self):
        return split_repr(self)
Generates an indexed series:  (0, collection[0]), (1, collection[1]), ...
dataset/ETHPy150Open AnyMesh/anyMesh-Python/example/urwid/widget.py/Widget.__repr__--crossover with--dataset/ETHPy150Open kdart/pycopia/aid/pycopia/aid.py/enumerate