Fix assert call count for python 3.5
Fix assert call count for python 3.5

tomalrussell/smif,tomalrussell/smif,willu47/smif,willu47/smif,nismod/smif,tomalrussell/smif,nismod/smif,nismod/smif,tomalrussell/smif,willu47/smif,willu47/smif,nismod/smif