Appengine - Can a user import Yaml or Json file to update datastore with new values?

Imagine this scenario:

I made a small application in Python for Google App Engine for general use.

Users can login to my app, update their profile, change address and change the picture among many othe开发者_Go百科r things.

A user can export the models to PDF, YAML and JSON, save the file on his computer.

You can download any available format of your personal information.

My question is:

Is It Possible for a user to upload files and update the datastore with new values?

Yes. Your users will be able to upload data in any file type your application can process. You will, of course, need to write handlers to process the files and perform the updates.

There are also some size restrictions with uploading, downloading, and processing data. You will want to keep those in mind.