[Python-Dev] When to use EOFError?

[Rob Cliffe]

So how about an EmptyFileError (or similar name) as a subclass of EOFError?


On 26/06/2016 21:42, Guido van Rossum wrote:
>
> I think this is an interesting idea and quite in line with the meaning 
> of EOFError.
>
> --Guido (mobile)
>
> On Jun 26, 2016 5:02 AM, "André Malo" <nd at perlig.de 
> <mailto:nd at perlig.de>> wrote:
>
>     * Serhiy Storchaka wrote:
>
>     > On 22.06.16 19:22, André Malo wrote:
>     > > I often concatenate multiple pickles into one file. When
>     reading them,
>     > > it works like this:
>     > >
>     > > try:
>     > >      while True:
>     > >          yield pickle.load(fp)
>     > > except EOFError:
>     > >      pass
>     > >
>     > > In this case the truncation is not really unexpected. Maybe it
>     should
>     > > distinguish between truncated-in-the-middle and
>     > > truncated-because-empty.
>     > >
>     > > (Same goes for marshal)
>     >
>     > This is interesting application, but works only for
>     non-truncated data.
>     > If the data is truncated, you just lose the last item without a
>     notice.
>
>     Yes (as said). In my case it's typically not a problem, because I
>     write them
>     myself right before reading them. It's a basically about spooling
>     data to
>     disk in order to keep them out of the RAM.
>     However, because of the truncation issue it would be nice, to have a
>     distinction between no-data and truncated-data.
>
>     Cheers,
>     --
>     Winnetous Erbe: <http://pub.perlig.de/books.html#apache2>
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