Python script to rotate appengine versions

cycle_version.py

#!/usr/bin/python

import sys, getopt, yaml

def main(argv):

   try:
      module_name = 'dev'
      yaml_versions_file = 'document.yaml'
      stream = file(yaml_file, 'r')
      versions = yaml.load(stream)[module_name]
      default_version = versions[0]
      versions.sort()
      oldest_version = versions[-1]
   except getopt.GetoptError:
      pass

if __name__ == "__main__":
   main(sys.argv[1:])