def restore_defaults(self):
        for key in self.default_values:
            self.restore_default(key)
            
        for section in self.sections:
            self[section].restore_defaults()
Backends can implement as needed to re-enable foreign key constraint
dataset/ETHPy150Open boakley/robotframework-workbench/rwb/lib/configobj.py/Section.restore_defaults--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/db/backends/__init__.py/BaseDatabaseWrapper.enable_constraint_checking