def setDefaultShadingGroup(*args, **kwargs):

    pass
The setDefaultShadingGroup command is used to change which shading group is considered the current default shading
dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.5/extras/completion/py/pymel/core/rendering.py/setDefaultShadingGroup