newbie: confused with example in Learning Python 2nd Edition: can anyone give a hint

[Dave Cole]

Steven Rumbalski wrote:
> Porky Pig Jr wrote:
> So the corrected code should look like:
> 
>>>>class Stack:
> 
>  ...     def __init__(self, data):
>  ...             self._data = list(data)
>  ...             self.push = _data.append
>  ...             self.pop = _data.pop

 >>>class Stack:
...     def __init__(self, data):
...             self._data = list(data)
...             self.push = self._data.append
...             self.pop = self._data.pop

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