nukeExrExplode.py

import nuke
 
def createShuffleEXR(gradeNodes):
    sel =nuke.selectedNode()  
    chanList=[]
    rr = sel.channels()
 
    for i in rr:
        temp = i.split('.')
        if (len(chanList)) == 0:
            chanList.append(temp[0])
        elif chanList[-1]!=temp[0]:
                chanList.append(temp[0])
 
    for i in chanList:
        tempNode = nuke.nodes.Shuffle(name=i)
        tempNode.setInput(0, sel)
        tempNode['in'].setValue(i)
        tempNode['postage_stamp'].setValue(True)
        if (gradeNodes==1):
            gNode = nuke.nodes.Grade(name=("Grade_"+i))
            gNode.setInput(0, tempNode)