# Python code
import maya.cmds as mc
import maya.OpenMaya as om

def getInstances():
    instances = []
    iterDag = om.MItDag(om.MItDag.kBreadthFirst)
    while not iterDag.isDone():
        instanced = om.MItDag.isInstanced(iterDag)
        if instanced:
            instances.append(iterDag.fullPathName())
        iterDag.next()
    return instances
inst = getInstances()

log ='INSTANCE LOG \n-------------- \n'

def uninstance(instances,log):
    for i in instances:
        try:
            parent = mc.listRelatives(i, parent=True, fullPath=True)
            mc.duplicate(parent, renameChildren=True)
            mc.delete(parent)

        except:
            log = log +"COULD NOT ===>"
            log = log +str(i)
            log = log+ "\n"
    log = log + "\n\nLOG END \n================="
    return log
bobn = uninstance(inst,log)
print bobn