def __delattr__(self, name):
# Names starting with an underscore are not preferences but normal
# instance attributes
if name.startswith('_'):
MutableMapping.__delattr__(self, name)
else:
del self._all_prefs[self._basename + '.' + name]
def __delattr__(self, name):
if 'pref_register' in self.__dict__ and name in self.pref_register:
raise PreferenceError("Cannot delete a preference category.")
else:
MutableMapping.__delattr__(self, name, value)