I do something slightly different.

I have a cache attribute available on every request.  On production it's 
the build#, on dev it's time.now()

then I just write out the attribute as a querystring :

   <img src="/path/to?{request.app_meta.release}"/>


On Wednesday, September 4, 2013 10:53:32 AM UTC-4, Chris McDonough wrote:
>
> On 09/04/2013 05:02 AM, luthur wrote: 
> > something like Tornado's static_url, the assets' url would be 
> xxx.xxx?v=123 
>
> https://github.com/maisano/pyramid_cachebust 
>

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