from multiprocessing import Semaphore

creatingID = Semaphore()

class Identifiable:
    lastID: int = 0

    def __init__(self):
        creatingID.acquire()
        self.lastID += 1
        self.id = self.lastID
        creatingID.release()

    def __eq__(self, other):
        return self.id == other.id and type(self) == type(other)