在绘制散点图的时候出现上图所示报错，原因是s必须是一个标量，或者让size与我们的x或y保持一致
也就是说我们我们在生成随机数的时候需要让生成的数量保持一致
size = np.random.rand(10)
改成
size = np.random.rand(100)
再行绘制散点图，如下：
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