William Stein wrote:
> On Thu, Aug 20, 2009 at 11:01 AM, Jason
> Grout<jason-s...@creativetrax.com> wrote:
>> William Stein wrote:
>>> On Thu, Aug 20, 2009 at 2:18 AM, Nathann Cohen<nathann.co...@gmail.com>
>>> wrote:
>>>> Hello !!!
>>>>
>>>> Starting from a kind of troll related to the next-to-be tour for
>>>> Graphs in Sage ( I wanted to color the map of western europe, but the
>>>> majority of Sage's users do not live there ), I tried to build a graph
>>>> of the whole world by using your dear CIA's data ( available freely on
>>>> their website )
>>>>
>>>> Do you think it would be interesting to add it to the graph generators
>>>> in Sage ?
>>> Yes.
>>>
>>>> It could be available as graphs.WorldMap() :-)
>>> Yes.
>>>
>>>> If so, I have a small problem : how to include it ? I generated it by
>>>> parsing again and again several files, then building the final graph
>>>> through Python, but the only way I have now to share this graph is to
>>>> write it by g.write().
>>> Why not just include a pickle of it? Make sure there is a doctest
>>> that involves creating it, so that we can't release a version of Sage
>>> if this pickle breaks.
>>>
>>> And if you say you can't pickle it, then something is wrong with
>>> pickling graphs, and we have a bigger problem to worry about!
>>>
>>> In case you don't know, you can use pickle as follows:
>>>
>>> sage: save(G, 'g.sobj')
>>> sage: G = load('g.sobj')
>>>
>>
>> Can we include binary data files with Sage? I thought for some reason
>> this was frowned upon.
>
> It is frowned upon, but only if they can't easily be removed, and/or
> easily recreated from some text form.
>
> I've been meaning to add a script that takes an existing Sage tarball
> and makes a "clean" binary-free tarball. This would mean removing the
> pickle jar and all the hg repositories.
So really, the code to construct the graph should be there, but it
should just treat the pickle as a cached version of the output?
It sounds like this could be made more general, like a @cache_output
decorator that saves a pickle. We could ship Sage with or without those
pickles, or maybe we could just bundle all of the pickles into an spkg
that is a standard install.
Jason
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