Upsert in Mongodb

[ji...@baabte.com]

I am trying to update data in mongodb with python web service, this i got an error

error is " global name 'upsert' is not defined"

This is the code 

                        userMenuCollection.update({'fkRoleId':ObjectId(data["role_id"])},{"$set":{'menuStructure.0.regionMenuStructure':data["menus"]}},{upsert:True})

pls help me