Python中多维数组的复制的问题

k329266978

今天在初始化一个三维数组时，采用一下几个方式初始化一个4X4X4的三维数组，初始化后
1）listpossibility=[[[1,2,3,4]]*4]*4
2）inipossibility=[1,2,3,4]
     listpossibility=[[ listpossibility.copy()]*4]*4
但是在最后对第三维数组进行单独的remove操作时，其他的数组也受影响
比如listpossibility[0][0].remove(1),所有的第三维数组都变成[2,3,4]
我尝试过
listpossibility=
[[[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]],
[[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]],
[[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]],
[[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]]]
这样初始化一个数组是可以避免这种情况的，但是我觉得这种比较蠢，请问有什么办法可以初始话一个多维数组吗？

塔利班

1. >>> listpossibility=[[[1,2,3,4] for _ in range(4)] for __ in range(4)]
   
2. >>> listpossibility
   
3. [[[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]], [[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]], [[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]], [[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]]]
   
4. >>> listpossibility[0][0].remove(1)
   
5. >>> listpossibility
   
6. [[[2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]], [[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]], [[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]], [[1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4], [1, 2, 3, 4]]]
   
7. >>>

复制代码

冬雪雪冬

1. listpossibility = [[[1, 2, 3, 4] for i in range(4)] for j in range(4)]
   
2. listpossibility[0][0].remove(1)
   
3. print(listpossibility)

复制代码

冬雪雪冬

1. listpossibility = [[[1, 2, 3, 4] for i in range(4)] for j in range(4)]
   
2. listpossibility[0][0].remove(1)
   
3. print(listpossibility)

复制代码

空青

我比较懒，喜欢用现成库

1. In [1]: from numpy import tile
   
2. 
   
3. In [2]: import numpy as np
   
4. 
   
5. In [3]: array1 = [1, 2, 3, 4]
   
6. 
   
7. In [4]: array1 = np.array([1,2,3,4])
   
8. 
   
9. In [5]: array2 = np.tile(array1, 16)
   
10. 
    
11. In [6]: array1
    
12. Out[6]: array([1, 2, 3, 4])
    
13. 
    
14. In [7]: array2
    
15. Out[7]:
    
16. array([1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2,
    
17.        3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4,
    
18.        1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4])
    
19. 
    
20. In [8]: array3 = array2.reshape(4,4,4)
    
21. 
    
22. In [9]: array3
    
23. Out[9]:
    
24. array([[[1, 2, 3, 4],
    
25.         [1, 2, 3, 4],
    
26.         [1, 2, 3, 4],
    
27.         [1, 2, 3, 4]],
    
28. 
    
29.        [[1, 2, 3, 4],
    
30.         [1, 2, 3, 4],
    
31.         [1, 2, 3, 4],
    
32.         [1, 2, 3, 4]],
    
33. 
    
34.        [[1, 2, 3, 4],
    
35.         [1, 2, 3, 4],
    
36.         [1, 2, 3, 4],
    
37.         [1, 2, 3, 4]],
    
38. 
    
39.        [[1, 2, 3, 4],
    
40.         [1, 2, 3, 4],
    
41.         [1, 2, 3, 4],
    
42.         [1, 2, 3, 4]]])
    

复制代码

k329266978

感谢各位的回复了！！！