我正在尝试使用我相当熟悉的turtle和OOP来制作一个自然选择模拟器，OOP对我来说是全新的。我似乎找不到我的特定问题的答案，这可能是因为我不理解它。我的代码目前看起来像这样：

import turtle
import time
import random

turtle.speed(50)
turtle.setworldcoordinates(-50, -50, 1920, 1080)

class Creature: # This class contains the blueprint for the 'blob' creature.
    def __init__(self, speed, location_x, location_y):  # Initializes parameters.
        self.speed = speed                              # Speed of the blob.
        self.location_x = location_x                    # X coordinate of the blob, paired with y forms location.
        self.location_y = location_y                    # Y coordinate of the blob, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    def spawn(self):
        turtle.penup()
        turtle.goto(Creature.location_x, Creature.location_y)   # Lets the turtle spawn in a random point.
        turtle.color("Blue")
        turtle.dot(20)
    def move(self):
        pass

class Apple: # This class contains the blueprint for the food (apples) that the blobs can eat.
    def __init__(self, location_x, location_y):
        self.location_x = location_x
        self.location_y = location_y
    def spawn(self):
        turtle.penup()
        turtle.goto(Apple.location_x, Apple.location_y)
        turtle.color("Red")
        turtle.dot(20)
    
blob1 =  Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))
blob2 =  Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))
blob3 =  Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))
blob4 =  Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))
blob5 =  Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))
blob6 =  Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))
blob7 =  Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))
blob8 =  Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))
blob9 =  Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))
blob10 = Creature(1.5, random.randint(0, 1000), random.randint(0, 1000))

apple1 = Apple(random.randint(0, 1000), random.randint(0, 1000))
apple2 = Apple(random.randint(0, 1000), random.randint(0, 1000))
apple3 = Apple(random.randint(0, 1000), random.randint(0, 1000))
apple4 = Apple(random.randint(0, 1000), random.randint(0, 1000))
apple5 = Apple(random.randint(0, 1000), random.randint(0, 1000))

Creature.spawn(all)

Apple.spawn(all)

turtle.exitonclick()

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我已经尝试改变一些东西，但没有帮助.一个解释也将是非常有帮助的，以及一些建议如何防止自己在未来遇到这个问题.此外，我不知道这是否是可能的，但你可以让你的程序使一个类的示例？我得到的错误代码如下：

Traceback (most recent call last):
  File "c:\Users\sidne\Programs(Python)\Natural selection simulator.py", line 64, in <module>
    blob1.spawn()
  File "c:\Users\sidne\Programs(Python)\Natural selection simulator.py", line 15, in spawn
    turtle.goto(Creature.location_x, Creature.location_y)   # Lets the turtle spawn in a random point.
                ^^^^^^^^^^^^^^^^^^^
AttributeError: type object 'Creature' has no attribute 'location_x'

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