Usar SQLite para el dev server

Pasando el argumento --use_sqlite

Ahora genera una excepción:

Traceback (most recent call last):
  File "./extra/cambiar-contrasenas.py", line 36, in <module>
    SetupStubs(config.application, **option_dict)
  File "/home/emilien/devel/google_appengine/google/appengine/tools/dev_appserver.py", line 4297, in SetupStubs
    trusted=trusted)
  File "/home/emilien/devel/google_appengine/google/appengine/api/datastore_file_stub.py", line 473, in __init__
    self.Read()
  File "/home/emilien/devel/google_appengine/google/appengine/api/datastore_file_stub.py", line 604, in Read
    for encoded_entity in self.__ReadPickled(self.__datastore_file):
  File "/home/emilien/devel/google_appengine/google/appengine/api/datastore_file_stub.py", line 662, in __ReadPickled
    '--clear_datastore flag. Cause:\n%r' % (filename, e))
google.appengine.api.datastore_errors.InternalError: Could not read data from /tmp/dev_appserver.datastore. Try running with the --clear_datastore flag. Cause:
ValueError('insecure string pickle',)

A ver lo que pasa