Maya_SetJntBindPose.py

import maya.cmds as cmds
import maya.api.OpenMaya as om2
import maya.api.OpenMayaAnim as omAnim2

def setNewBindPose():
    sel = om2.MGlobal.getActiveSelectionList()
    jntMObj = sel.getDependNode(0)
    jntDepNode = om2.MFnDependencyNode(jntMObj)
    jntWMtxPlug = jntDepNode.findPlug("worldMatrix", False).elementByLogicalIndex(0)

    skinClusterDepNode = None
    skinClusters = {}
    conns = jntWMtxPlug.connectedTo(False, True)
    for plug in conns:
        if plug.node().hasFn(om2.MFn.kSkinClusterFilter):
            skinClusterDepNode = om2.MFnDependencyNode(plug.node())
            skinCluster = omAnim2.MFnSkinCluster(plug.node())   
            skinClusters[skinCluster] = plug
            
    if skinClusters.keys() is None:
        print "No skin clusters found!"
        return False
            
    for skinCluster, plug in skinClusters.iteritems():
        print skinCluster.name()
        plugIndex = int(plug.name().split('[')[1].split(']')[0])
        jntBindPreMtxPlug = skinCluster.findPlug("bindPreMatrix", False).elementByLogicalIndex(plugIndex)
        jntWInvMtxPlug = jntDepNode.findPlug("worldInverseMatrix", False).elementByLogicalIndex(0)
        
        jntInvMatrixData = om2.MFnMatrixData( jntWInvMtxPlug.asMObject() ).object()
        jntBindPreMtxPlug.setMObject(jntInvMatrixData)
        
setNewBindPose()