record_defaults = [[0.0] for _ in range(10)]
>>> record_defaults
[[0.0], [0.0], [0.0], [0.0], [0.0], [0.0], [0.0], [0.0], [0.0], [0.0]]
就是一种拷贝
![[[0.0] for](http://www.mshxw.com/aiimages/31/320278.png "[[0.0] for")
record_defaults = [[0.0] for _ in range(10)]
>>> record_defaults
[[0.0], [0.0], [0.0], [0.0], [0.0], [0.0], [0.0], [0.0], [0.0], [0.0]]
就是一种拷贝
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