Remove .SVN file by Python

#!/usr/bin/python    
# -*- coding: utf8 -*-    
   
import sys, os, stat
def walk(path):
    for item in os.listdir(path):
        subpath=os.path.join(path, item)
        mode=os.stat(subpath)[stat.ST_MODE]
        if stat.S_ISDIR(mode):
            if item==".svn":
                print "Cleaning %s ..." % subpath
                print "%d deleted" % purge(subpath)
            else:
                walk(subpath)    
   
def purge(path):
    count=0
    for item in os.listdir(path):
        subpath=os.path.join(path, item)
        mode=os.stat(subpath)[stat.ST_MODE]
        if stat.S_ISDIR(mode):
            count+=purge(subpath)
        else:
            os.chmod(subpath, stat.S_IREAD|stat.S_IWRITE)
            os.unlink(subpath)
            count+=1
    os.rmdir(path)
    count+=1
    return count   
   
if len(sys.argv)!=2:
    print "Usage: python SVNClean.py path"
    sys.exit(1)    
   
walk(sys.argv[1])