When I updated my packages I have this new error:
class TreeBuilderForHtml5lib(html5lib.treebuilders._base.TreeBuilder): AttributeError: \'module\' object ha
edit nov, 2017: it seems this doesn't work any more
Finally found out, a search engine didn't throw anything but it's referenced on beautifulsoup's issue tracker: https://bugs.launchpad.net/beautifulsoup/+bug/1603299
it works back with html5lib v0.9999999 (7 nines)
0.9999999
"html5lib<=0.9999999"