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| import copy | |
| a = [[0,1],[2,3]] | |
| b = copy.copy(a) | |
| print(id(a)==id(b)) | |
| # False | |
| b[1] = 100 | |
| print(a,b) | |
| # [[0, 1], [2, 3]] [[0, 1], 100] | |
| b[0][0] = -999 | |
| print(a,b) | |
| # [[-999, 1], [2, 3]] [[-999, 1], 100] | |
| print(id(a[0]) == id(b[0])) | |
| # True |
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