Writes certain properties of a feature layer within a group layer to csv.

writeLyrPropertiesToCSV.py

#
# @date 11/05/2015
# @author Cindy Williams
#
# Writes certain properties of a layer within a group
# layer in a mxd to csv.
# 
# For use in the Python window in ArcMap.
#

import arcpy
import csv

mxd = arcpy.mapping.MapDocument("CURRENT")
lyrs = [lyr for lyr in arcpy.mapping.ListLayers(mxd) if lyr.isFeatureLayer]

outcsv = r"C:\Some\Arb\Folder\comp.csv"

with open(outcsv, 'wb') as csvfile:
    csvwriter = csv.writer(csvfile)
    csvwriter.writerow(["Group Layer Name", "Dataset Name", "Projection", "Number of features"])
    for lyr in lyrs:
        desc = arcpy.Describe(lyr)
        csvwriter.writerow(lyr.longName.split("\\")[0], 
        		   lyr.datasetName, 
        		   desc.spatialReference.name, 
        		   str(len([row[0] for row in arcpy.da.SearchCursor(lyr, desc.OIDFieldName)])))
        print("Wrote properties for " + lyr.name)