[Tutor] Subclassing list

[bob gailer]

Luis N wrote:
> I get an error "TypeError: 'rounding' is an invalid keyword argument
> for this function" on my list subclass.
>
> How might I subclass list without this error?
>
> This is the code:
>
> class SeriesList(list):
>     def __new__(cls, *args, **kwargs):
>         series_list = list.__new__(cls, *args)
>         series_list.rounding = kwargs.get('rounding', None)
>         return series_list
>
>     def moving_average(self, function, period=10):
>         index = 0
>         window = []
>         ma = []
>         for i in self.__iter__():
>             i = float(i)
>             if is_not_nan(i):
>                 window.insert(0, i)
>                 if len(window) == period:
>                     ma.append(function(window))
>                     window.pop()
>             else:
>                 ma.append(float('nan'))
>         return round(ma, self.rounding)
> ---
>   

I copied and ran the above. It gives me no errors.

Of course all it is is a class definition.

Is there more to the code?

And please post the traceback so we have more information!

-- 
Bob Gailer
Chapel Hill NC
919-636-4239