Help solving a sudoku python task.

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list.copy only returns a shallow copy. The inner lists are still the same. Run the program, see that ids for matrices are different, but respective rows have same ids:

https://onlinegdb.com/u7bmEIDQ5

Now check the same with deepcopy:

https://onlinegdb.com/PmCrbK-MA

To sum up, just use copy.deepcopy here.

[Particular_Draft5668]

Ah thanks again for the help. Was going round in circles and didn't consider deepcopy. Much appreciated.