Question

Using datastore framework of appengine, what’s the pythonic way to make persistent a {}?

Answer 1

I think there are 2 options.

1. Using expando. You can store anything in that as long as you omit the reserved fields:

   class SomeModel(db.Expando):
       pass
   
   your_model = SomeModel()
   for k, v in your_dict.iteritems():
       setattr(your_model, k, v)
   

   It might be possible to use your_model.__dict__.update(your_dict) but I’m not sure about that.

2. Store it in a textfield using pickle:

   class SomeModel(db.Model):
       pickled_data = db.BlobProperty()
   
   your_model = SomeModel()
   your_model.pickled_data = pickle.dumps(your_dict)