def allMPx():
    global _allMPx
    if _allMPx is None:
        _allMPx = []
        for _, cls in inspect.getmembers(mpx, lambda x: inspect.isclass(x) and issubclass(x, mpx.MPxNode)):
            _allMPx.append(cls)
    return _allMPx

# We want to make sure we know if maya adds a new MPx class!
Returns a list of all MPx classes
dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.5/pymel/api/plugins.py/allMPx