class Foo:
	def __init__(self, a):
		self._a = a
		
	@property
	def b(self):
		self._a += 1
		return self._a
		
A = Foo(1)
# outputs 2 to 201
for i in range(200):
	print(A.b)
	
A = Foo(1)
B = A.b

# outputs 2 over and over
for i in range(200):
	print(B)