def __isub__(self, s):
        return self.difference(s)
Checks to see if any of the files changed match any of the file
dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/pymel/core/nodetypes.py/ObjectSet.__isub__--crossover with--dataset/ETHPy150Open gosquadron/squadron/squadron/service.py/_checkfiles