On Wed, Jul 3, 2013 at 1:39 AM, Mic <mictadlo at gmail.com> wrote: > Thank you it is working, but why python did not complain previously? > > Mic Because Python lets you dynamically add attributes to objects, e.g. >>> class Duck(object): ... pass ... >>> donald = Duck() >>> donald.name = "Donald" >>> donald.name 'Donald' Regards, Peter