fix for python 2.7 not liking yield from
fix for python 2.7 not liking yield from

int19h/PTVS,huguesv/PTVS,huguesv/PTVS,zooba/PTVS,huguesv/PTVS,huguesv/PTVS,int19h/PTVS,zooba/PTVS,huguesv/PTVS,zooba/PTVS,zooba/PTVS,int19h/PTVS,huguesv/PTVS,zooba/PTVS,zooba/PTVS,int19h/PTVS,int19h/PTVS,int19h/PTVS