custom_deletion_exception_method

custom_deletion_exception_method.py

class DeletionException(Exception):
    def __init__(self, original_value):
        self._original_value = original_value

    def __str__(self):
        return 'The value for the name attribute, {} can not be deleted'.format(self._original_value)


class Employees(object):
    def __init__(self, name, age, id_number):
        self._name = name
        self._age = age
        self._id_number = id_number

    def __setattr__(self, key, value):
        if key == '_name' and hasattr(self, '_name'):
            raise AttributeError('The value for the name attribute has already been set, and can not be re-set')
        if key in ['_age', '_id_number']:
            self.__dict__[key] = int(value)

        self.__dict__[key] = value

    def __delattr__(self, key):
        if key == '_name':
            raise DeletionException(self.__dict__['_name'])
        else:
            del self.__dict__[key]


emp_1 = Employees('stephen', 30, 19242)

del emp_1._name