StephenFordham

class Restaurants(object):
	def __init__(self, wk1):
		self.wk1 = wk1

	def __getattr__(self, item):
		raise AttributeError('available attributes are .wk1')

wk1_city_1 = Restaurants([10, 20, 30, 40, 50])

print(wk1_city_1.wk1)

StephenFordham

class Restaurants(object):
	def __init__(self, wk1):
		self._wk1 = wk1

	def __setattr__(self, key, value):
		if not isinstance(value, list):
			raise TypeError('please enter weekly takings a list')
		for val in value:
			if not isinstance(val, (int, float)):
				raise ValueError('weeking takings must be integers or floats')

StephenFordham

def __setattr__(self, name, value):
    self.name = value
    # Do not do this
    # since every time an attribute is assigned, __setattr__() is called, this
    # is recursion.
    # so this really means self.__setattr__('name', value). Since the method
    # keeps calling itself, the recursion goes on forever causing a crash

def __setattr__(self, name, value):
    self.__dict__[name] = value 

StephenFordham

class Restaurants(object):
	def __init__(self, wk1):
		self._wk1 = wk1

	def __ge__(self, other):
		return sum(self._wk1) >= sum(other._wk1)

	def __le__(self, other):
		return sum(self._wk1) <= sum(other._wk1)

StephenFordham

class Restaurants(object):
	def __init__(self, wk1):
		self._wk1 = wk1

	def __getitem__(self, item):
		weekday_dict = {'Monday': 0, 'Tuesday': 1, 'Wednesday' : 2, 'Thursday': 3, 'Friday': 4}
		if item in weekday_dict:
			return self._wk1[weekday_dict[item]]
		else:
			return self._wk1[item]

StephenFordham

class Restaurants(object):
	def __init__(self, wk1):
		self._wk1 = wk1

	def __iadd__(self, other):
		retval = sum(self._wk1) + sum(other._wk1)
		return retval

wk1_city = Restaurants([10, 20, 30, 40, 50])
wk1_same_city = Restaurants([20, 40, 60, 80, 100])

StephenFordham

class Restaurants(object):
	def __init__(self, wk1):
		self._wk1 = wk1

	def __add__(self, other):
		retval = [x + y for x, y in zip(self._wk1, other._wk1)]
		return Restaurants(retval)

	def __str__(self):
		return str(self._wk1)

StephenFordham

class Employees(object):
	def __init__(self, name, age, service_length):
		self._name = name
		if 18 <= age <= 100:
			self._age = age
		else:
			raise AttributeError('The age range must be between 18 and 100')
		self._service_length = service_length

StephenFordham

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

	@property
	def name(self):
		return self._name.title()

StephenFordham

def attr_check(method):
	def inner(ref, name, age, service):
		for attr in [age, service]:
			if not isinstance(attr, int):
				raise TypeError('age and service must be of type int')
		return method(ref, name, age, service)
	return inner

class Employees(object):
	@attr_check