setattr_and_delattr

setattr_and_delattr.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:
			if key == '_age' or key == '_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]