##########################################################################
# Amber R. Cannon - GIS Manager - acannon@wdtinc.com
# Weather Decision Technologies, Norman, OK
# 6/28/2016
# batch_rename_layers.py
# Description: The purpose of this script is batch rename layers in a mxd
##########################################################################

# import system modules 
import arcpy

#Set Global Variables
mxd = arcpy.mapping.MapDocument("CURRENT")
df = arcpy.mapping.ListDataFrames(mxd, '')[0]

#Perform Renaming Operation
for lyrs in arcpy.mapping.ListLayers(mxd, "*", df):
    if lyrs.name == '<old_name>':
        lyrs.name = '<New Name>'

#Refresh Table of Contents
arcpy.RefreshTOC()
#Refresh Active View
arcpy.RefreshActiveView()