Use the pyramid session object as the cubiweb session.data (needs a patched cw 3.19)
Related to #4291173
sampleapp READMEBefore pip installing cubicweb, the following packages are required (on aubuntu 14.04) :libgecode-devlibxml2-devlibxslt1-devpython-devlibz-devlibpq-dev