new_contents: #!/usr/bin/env python
  
  import json, sys, time
  
  count = int(sys.argv[1])
  
  for n in sys.argv[2:]:
      print '%s:' % n
      obj = json.load(open(n))
      start = time.time()
      for i in xrange(count):
          json.dumps(obj)
      end = time.time()
      print ' ', end - start
  
subject: Add a Python encoder