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| In [1]: x = [1,2,3]
In [2]: y = x.copy()
In [3]: x[1] = 1
In [4]: x Out[4]: [1, 1, 3]
In [5]: y Out[5]: [1, 2, 3]
In [6]: x = [1,2,3]
In [7]: y = x[:]
In [8]: x[1] = 1
In [9]: x Out[9]: [1, 1, 3]
In [10]: y Out[10]: [1, 2, 3]
In [11]: x = [[1,2,3],[4,5,6],[7,8,9]]
In [12]: y = x.copy()
In [13]: x[1][1] = 0
In [14]: x Out[14]: [[1, 2, 3], [4, 0, 6], [7, 8, 9]]
In [15]: y Out[15]: [[1, 2, 3], [4, 0, 6], [7, 8, 9]]
In [16]: import copy
In [17]: x = [[1,2,3],[4,5,6],[7,8,9]]
In [18]: y = copy.copy(x)
In [19]: x[1][1] = 0
In [20]: x Out[20]: [[1, 2, 3], [4, 0, 6], [7, 8, 9]]
In [21]: y Out[21]: [[1, 2, 3], [4, 0, 6], [7, 8, 9]]
|