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- In [51]: stage = [[False]*3]*3
- In [52]: stage
- Out[52]: [[False, False, False], [False, False, False], [False, False, False]]
- In [53]: stage[1][1] = True
- In [54]: stage
- Out[54]: [[False, True, False], [False, True, False], [False, True, False]]
- #[0][1], [2][1]もTrueになっている
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