purge_old.py

import os, sys
from time import gmtime, strftime
from stat import *

def walktree(top, callback):
   for f in os.listdir(top):
      pathname = os.path.join(top, f)
      mode = os.stat(pathname)[ST_MODE]
      if S_ISDIR(mode):
         # It's a directory, recurse into it
         walktree(pathname, callback)
      elif S_ISREG(mode):
         # It's a file, call the callback function
         callback(pathname)
      else:
         # Unknown file type, print a message
         print 'Skipping %s' % pathname

def oldfiles(file):
      now   = gmtime()
      then  = gmtime(os.stat(file)[ST_MTIME])                  # magic
      alike = lambda x,y: ((x[0] == y[0]) and (x[1] == y[1]))  # more magic
      if (not (alike(now, then))):
         # Uncomment the following if you are sure you want to delete:
         # os.remove(file)
         # Otherwise, just print it:
         print file

if __name__ == '__main__':
    walktree(sys.argv[1], oldfiles)