Write a list of personal geodatabase feature classes to a CSV file

gdbList2csv.py

import csv, arcpy
from arcpy import env

# set path using raw string to personal geodatabase
env.workspace = r"c:\users\mdiener\documents\mypersonalgeodatabase.gdb"

# create a python list of all datasets in personal geodatabase
datasetList = arcpy.ListDatasets('*','Feature')

# open a file for writing.
filename = r'c:\users\mdiener\documents\demo.csv'

#open create new csv file 
with open(filename, 'wb') as myfile:
    
    wr = csv.writer(myfile,quoting=csv.QUOTE_ALL)
    
    for dataset in datasetList:
        env.workspace = dataset
        fcList = arcpy.ListFeatureClasses()

        print(fcList)
        # uncomment this if you want the csv all in one line
        # if not use code as is
        # wr.writerow(fcList)
        for each_fs in fcList:
            wr.writerow(each_fs.split(","))
            print (each_fs)