ev.py

class Rectangle:
	def __init__(self, width, height):
		self.width = width
		self.height = height
		self._id = 0

	def area(self):
		return self.width * self.height

	def perimeter(self):
		return 2*self.width + 2*self.height

	@property
	def id(self):
		return self._id

	@id.setter
	def id(self, id):
		self._id = id
	

if __name__ == '__main__':
	store = []
	while 1:
		print("1. Create new rectangle")
		print("2. Display an already stored rectangle")
		print("3. Quit")
		inp = int(input())
		if inp == 1:
			w, h = map(int, input().split(" "))
			rect = Rectangle(w, h)
			rect.id = len(store)+1
			print(f"The id is {rect.id}")
			store.append(rect)
		elif inp == 2:
			print("Which rectangle?", list(range(1, len(store)+1)))
			inp = int(input())
			if inp < 0 or inp > len(store):
				print("Invalid id")
			rect = store[inp-1]
			print("Unique Number", rect.id)
			print("Sides", rect.width, rect.height)
			print("Area", rect.area())
			print("Perimeter", rect.perimeter())
			print()
		elif inp == 3:
			print("Quitting...")
			break