[google-appengine] How to use the data of StringProperty as strings?

[saintthor]

#using datastore, create the entity

class Dj_User( db.Model ):
    UsName = db.StringProperty( multiline = True )

    def PutUser( self, uD ):
        self.UsName = uD['UserName']
        self.put()

#then read it and write to response, all ok

for user in Dj_User.all()
    self.response.out.write( user.UsName )

#but when using the user.UsName as strings, an error occurs

for user in Dj_User.all()
    self.response.out.write( user.UsName + '<br/>' )

#can not use str() on user.UsName either

for user in Dj_User.all()
    self.response.out.write( str( user.UsName ) + '<br/>')

How can i use the user.UsName as strings?

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