python maya rename joints

import maya.cmds as cmds

# Get a list of all nodes that end with '_M'
nodes_to_rename = cmds.ls("*:*_M")

# Rename each node to end with '_Mocap_M'
for node in nodes_to_rename:
    new_name = node.replace("_M", "_Mocap_M")
    cmds.rename(node, new_name)

nodes_to_rename = cmds.ls("*:*_L")

for node in nodes_to_rename:
    new_name = node.replace("_L", "_Mocap_L")
    cmds.rename(node, new_name)

nodes_to_rename = cmds.ls("*:*_R")

for node in nodes_to_rename:
    new_name = node.replace("_R", "_Mocap_R")
    cmds.rename(node, new_name)