import os
import sys
import xml.etree.ElementTree as ET
import xml.dom.minidom
import xml.dom

#declare path
dir = 'path to the dir'
print('dir = ' + dir)
print('dir (absolute) = ' + os.path.abspath(dir))


for root, subdirs, files in os.walk(dir):
    print('--\nroot = ' + root)
    for subdir in subdirs:
        print('\t- subdirectory ' + subdir)
        path = './patents/100/' + subdir
        for filename in os.listdir(path):
           print (filename)
            if not filename.endswith('.XML'): continue
            path2xml = os.path.join(path, filename)