How to solve an 'Attribute error' in classes for instance attributes?

Question

My homework needs to write functions in two classes(Person and World) and I'm pretty sure my code is correct. However,

"AttributeError: 'World' object has no attribute 'destination'"

keeps showing up when self.destination only exist in Person class.

It seems like the word 'self' is now referring to World class and I cannot figure out why.

class Person:
    def __init__(self, world_size):
        self.world_size = world_size
        self.radius = 7
        self.location = turtle.position()#this cause attribute error
        self.destination = self._get_random_location()#and this causes too

    #moves person towards the destination
    def move(self):
        turtle.setheading(turtle.towards(self.destination))
        turtle.forward(self.radius/2)

Should I be replacing the 'self' with other words for Person class? If so, how could I do it?

class World:
    def __init__(self, width, height, n):
        self.size = (width, height)
        self.hours = 0
        self.people = []
        self.add_person()

    #everything involve of Person class in World class
    #add a person to the list
    def add_person(self):
        person = Person(1)
        self.people.append(person)

    def simulate(self):
        self.hours += 1
        Person.update(self)

    def draw(self):
        p = Person(self)
        p.draw()

**

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\ \AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 1702, in __call__
    return self.func(*args)
  File "C:\Users\ \AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 746, in callit
    func(*args)
  File "C:\Users\Desktop\VIRUS_PART_A.py", line 261, in __animation_loop
    self.tick()
  File "C:\Users\Desktop\VIRUS_PART_A.py", line 216, in next_turn
    self.world.simulate()
  File "C:\Users\Desktop\VIRUS_PART_A.py", line 124, in simulate
    Person.update(self)
  File "C:\Users\Desktop\VIRUS_PART_A.py", line 71, in update
    Person.move(self)
  File "C:\Users\Desktop\VIRUS_PART_A.py", line 79, in move
    turtle.setheading(turtle.towards(self.destination))
AttributeError: 'World' object has no attribute 'destination'

**

Answer 1

You have Person on list self.people so you should use this list in loop

def simulate(self):
    self.hours += 1
    for item in self.people:
        item.update(self)

def draw(self):
    for item in self.people:
        item.draw()

Probably in Person you use Person.move() but you should use self.move() or something similar.