I have a parsed lxml.etree object that I need to persist from one request 
to the next so that users can interact with it. The problem is that etree 
objects can't be pickled, so when I try to store it in session I get a 
PicklingError. I just tried using memcache instead, but it seems to use 
pickling as well and raises the same PicklingError.

Is there any way to store an un-picklable object (maybe in memory somehow?) 
so that it's accessible to web2py on subsequent requests?

Thanks,

Ian

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