def __delitem__(self, id):
if not IMutableCollection.providedBy(self):
raise NotImplementedError
try:
index = self.__ids.index(id)
self.__ids.remove(id)
del self.__components[index]
except ValueError:
raise KeyError(id)
def set(self, id, value):
if not IMutableCollection.providedBy(self):
raise NotImplementedError
if not self.type.providedBy(value):
raise TypeError(value)
try:
self.__components[self.__ids.index(id)] = value
except ValueError:
raise KeyError(id)
