如何解决类中的“属性错误”实例属性？

Question

我的作业需要在两个类（人和世界）中编写函数，我很确定我的代码是正确的。然而，

“AttributeError：'世界'对象没有属性'目的地'”

当self.destination仅存在于Person类中时，它会一直显示。

似乎“自我”这个词现在指的是世界级，我无法弄清楚为什么。

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)

我应该用Person类替换'self'和其他词吗？如果是的话，我怎么能这样做？

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

列表self.people上有Person，所以你应该循环使用这个列表

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

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

可能在Person你使用Person.move()但你应该使用self.move()或类似的东西。