iPod music backup script

#!/usr/bin/env python
# -*- coding: utf-8 -*-

### globals
import os
import shutil

def swapextensions(copy_from, copy_to):
    count = 0
    for path, subdirs, files in os.walk(copy_from):
        for file in files:
            if file[:1] != '.':
                count += 1
                shutil.copy('%s/%s'%(path,file), '%s/%s'%(copy_to,file))

if __name__ == '__main__':
    import sys
    if len(sys.argv) != 3:
        print 'Usage: swapext rootdir before after'
        sys.exit(100)
    swapextensions(sys.argv[1], sys.argv[2])

how to use?

python copy_files.py /Volumes/xxx/iPod_Control/Music destination_path