class Mixin:
	def __init__(self, *args, **kwargs):
		pass

class Valuation:
	def __init__(self):
		self._qty = 0

	def qty(self):
		print('Valuation::qty')
		return self._qty

class SubscriptionValuation:
	def __init__(self):
		self._qty = 0

	def qty(self):
		print('SubscriptionValuation::qty')
		return self._qty

class Valuatable(Mixin):
	def __init__(self, *args, **kwargs):
		print("Enter Valuatable")
		super().__init__(**kwargs)
		self.valuation = (kwargs.get('valuation') or Valuation)()
		print("Leave Valuatable")

	def qty(self):
		return self.valuation.qty()

class Summation:
	def __init__(self):
		self._total = 0

	def total(self):
		print('Summation::total')
		return self._total

class SubscriptionSummation:
	def __init__(self):
		self._total = 0

	def total(self):
		print('SubscriptionSummation::total')
		return self._total

class Summable(Mixin):
	def __init__(self, *args, **kwargs):
		print("Enter Summable")
		super().__init__(**kwargs)
		self.summation = (kwargs.get('summation') or Summation)()
		print("Leave Summable")

	def total(self):
		return self.summation.total()

class Form(Valuatable, Summable):
	def __init__(self, *args, **kwargs):
		self.id = kwargs.get('id') or ''
		self.name = kwargs.get('name') or ''
		super().__init__(*args, **kwargs)

f1 = Form(name='normal 1', valuation=Valuation)
print(f1.qty())
print(f1.total())
f2 = Form(name='subscription 2', valuation=SubscriptionValuation, summation=SubscriptionSummation)
print(f2.qty())
print(f2.total())