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Fri May 7 08:55:45 EDT 2004 · https://mail.python.org/pipermail/python-dev/2004-May/044718.html

On Fri, 2004-05-07 at 02:10, Fred L. Drake, Jr. wrote:
> On Friday 07 May 2004 12:29 am, Guido van Rossum wrote:
>  > I have a different POV.  I don't think there is a compelling reason to
>  > change this attribute into a set (I doubt it's so time-critical as to
>  > make a difference) and given that the attribute isn't flagged as
>  > "private" by having a name starting with underscore, I think the
>  > change ought to be reverted.
> 
> I'd like to suggest that we either document the "right way" to extend the 
> information to support new URL schemes, and possibly add a function as the 
> way to do that.  Having to update a whole set of lists from outside the 
> module seems a poor and error-prone way to do this.

It sounds like appending to the list was the right way up until now. 
That is, extending the list of protocols is a reasonable feature and
using a list with a non-underscore name provided one obvious was to do
that.

Jeremy

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[Python-Dev] what level of backward compatibility? how