第16 步：我们的 if 语句永远不会为真，因为我们将数字与"string" （文本）进行比较！
- 找到看起来像if · distance · == · "yes"的代码行： ¬
- 将== (完全等于) 更改为<= (小于或等于)
- 将"yes"更改为200 。确保200不在引号中。如果是，您将收到错误消息！
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stage.set_background("schoolentrance")
stage.wait(2)
stage.create_grid_overlay(50, "blue")
stage.set_background_color("azure")
emma = codesters.Sprite("person1")
emma.set_size(0.5)
michael = codesters.Sprite("person2")
michael.set_size(0.5)
emma_x = random.randint(-230,230)
emma_y = random.randint(-230,230)
emma.go_to(emma_x, emma_y)
michael_x = random.randint(-230,230)
michael_y = random.randint(-230,230)
michael.go_to(michael_x, michael_y)
delta_x = emma_x - michael_x
delta_y = emma_y - michael_y
distance = math.sqrt((delta_x**2) + (delta_y**2))
if distance == "yes":
# add your code here
emma.say("I am a sprite.")
