employees_instance

employees_instance.py

# 1. using dunder __setattr__, __delattr__,

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

	def __setattr__(self, key, value):
		if key == '_name' and hasattr(self, '_name'):
			raise AttributeError('This attribute can only be set once in the init method')

		elif key == '_name':
			self.__dict__[key] = value.title()

		else:
			for key in ['_age', '_service_length']:
				if not isinstance(value, int):
					raise TypeError
				self.__dict__[key] = value

	def __delattr__(self, key):
		if key == '_name':
			raise AttributeError('This attribute cannot be deleted')
		else:
			del self.__dict__[key]

emp = Employees('stephen', 29, 5)

# emp._name = 'new name'

# print(emp.__dict__)

# for type_check in emp.__dict__:
# 	print(type(emp.__dict__[type_check]))

del emp._name
# del emp._age
# print(emp.__dict__)