Maya: Unfreeze Transform

mut.py

import pymel.core

for node in pymel.core.ls(selection=True):
    grp1 = pymel.core.group(empty=True)
    grp2 = pymel.core.group(empty=True)
    
    pymel.core.delete(pymel.core.parentConstraint(node, grp1))
    pymel.core.delete(pymel.core.parentConstraint(node, grp2))
    
    pymel.core.parent(node, grp1)
    grp1.tx.set(0)
    grp1.ty.set(0)
    grp1.tz.set(0)
    grp1.rx.set(0)
    grp1.ry.set(0)
    grp1.rz.set(0)
    
    pymel.core.parent(node, w=True)
    pymel.core.makeIdentity(node, apply=True, t=1, r=1, s=1, n=0)
    
    pymel.core.delete(pymel.core.parentConstraint(grp2, node))
    pymel.core.delete([grp1, grp2])