Python script for renaming armature bones in Blender. Specific to figures being imported from Daz Studio/Poser to Blender.

rename_all_bones.py

import bpy
import re

def rename_all_bones():
    armature = bpy.context.active_object
    bones = armature.data.bones
    
    for bone in bones:
        new_name = rename_bone(bone.name)
        if new_name is not "":
            armature.data.bones[bone.name].name = new_name
    
def rename_bone(name):
    if "root" in name:
        return ""
    
    if name.find('l', 0, 1) is not -1:
        print(name)
        name = name[1:] + '.L'
    elif name.find('r', 0, 1) is not -1:
        name = name[1:] + '.R'
        
    return name


rename_all_bones()