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Created January 27, 2014 02:51
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Python の shallow copyとdeep copyについて
Raw
sh
In [1]: a=[[0]*5]*4
In [2]: a
Out[2]: [[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0]]
In [3]: a[0][0]=1
In [4]: a
Out[4]: [[1, 0, 0, 0, 0], [1, 0, 0, 0, 0], [1, 0, 0, 0, 0], [1, 0, 0, 0, 0]]
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