PrototypedFrom of a list

test_proto.py

from traits.api import \
    PrototypedFrom, Float, HasTraits, Instance, Str, List, on_trait_change

from copy import copy

class Parent (HasTraits):
    first_name = Str
    family_name = ''
    favorite_first_name = Str
    child_allowance = Float(1.00)
    things = List(['bicycle', 'house'])

class Child (HasTraits):
    __prefix__ = 'child_'
    first_name = PrototypedFrom('mother', 'favorite_*')
    last_name  = PrototypedFrom('father', 'family_name')
    allowance  = PrototypedFrom('father', '*')
    things     = PrototypedFrom('father', 'things')
    father     = Instance(Parent)
    mother     = Instance(Parent)

    #@on_trait_change('things')
    def _things_items_changed(self, old, new):
        print "Appending"
        print old
        print new
        if self.things is self.father.things:
            self.things = copy(self.things)
        #self.things.append(new_thing)


fred = Parent( first_name = 'Fred', family_name = 'Lopez', favorite_first_name = 'Diego', child_allowance = 5.0 )
maria = Parent(first_name = 'Maria', family_name = 'Gonzalez', favorite_first_name = 'Tomas', child_allowance = 10.0 )
nino = Child( father=fred, mother=maria )

nino.things.append('toys')
nino.things.append('even more toys')
print fred.things