Build a spatial index for all shapefiles in a directory with ArcGIS

indexShapefile.py

import arcpy
from arcpy import env
import os
 
# Set the workspace for the ListFeatureClass function
#
env.workspace = "C:\\data\\mydata"
 
# Use the ListFeatureClasses function to return a list of 
#  all shapefiles.
#
fcList = arcpy.ListFeatureClasses()
 
# Create a spatial index for each shapefile
#
for fc in fcList:
    arcpy.AddSpatialIndex_management(fc, "")