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import maya.cmds as cmdsimport maya.OpenMaya as omsel = cmds.ls(sl=True)children = cmds.listRelatives(sel, children = True)frame = cmds.currentTime(query = True)if sel:    for child in children:        attr = "{0}.ty".format(child) # attr is like pCube.ty        if child.startswith("left"):            cmds.setAttr(attr, frame)        elif child.startswith("right"):            cmds.setAttr(attr, -frame)else:    om.MGlobal.displayError("No objects selected")

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