def extend( self, value ):
		value = self.beforeMultipleAdd([ self.beforeAdd(item) for item in value ])
		return super(rlist,self).extend( value )
x.__contains__(y) <==> y in x.
dataset/ETHPy150Open correl/Transmission-XBMC/resources/lib/basictypes/rlist.py/rlist.extend--crossover with--dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.5/extras/completion/py/pymel/util/namedtuple.py/_iskeyword