def getCascadingDictItem( dict, keys, default={} ):

    currentDict = dict
    for key in keys[:-1]:
        if isMapping(currentDict) and key not in currentDict:
            currentDict[key] = {}
        currentDict = currentDict[key]
    try:
        return currentDict[keys[-1]]
    except __HOLE__:
        return default
dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/pymel/util/arguments.py/getCascadingDictItem