How do I get a list of namespaces on google app engine?

Question

I would like to make a backup of all user data in the datastore. My application is using the new namespace feature to provide multi tenanting on a per user basis (as per the ex

Answer 1

Since SDK 1.4.0 you can use Metadata Queries:

from google.appengine.ext.db import metadata

for ns in metadata.get_namespaces():
    print "namespace: '%s'" % ns.namespace_name

For NDB the import is slightly different:

from google.appengine.ext.ndb import metadata