Can someone try to propose a PR on https://github.com/python/buildmaster-config/blob/master/master/custom/builders.py to remove Windows 7 from stable buildbots? That would remove them from stable on all Python branches.

The other option would be to hack https://github.com/python/buildmaster-config/blob/master/master/custom/workers.py to exclude 3.x branch from Windows 7 workers.

The last option is to hack https://github.com/python/buildmaster-config/blob/master/master/master.cfg to add a special rule to not schedule jobs on the 3.x branch if "win7" flag is present.

I'm not sure which approach is the best. Maybe @zware or @pablogsal have an opinion on that :-)