I want to copy a 2D list, so that if I modify one list, the other is not modified.
For a one-dimensional list, I just do this:
a = [1, 2] b = a[:]
And now if I modify b, a is not modified.
But this doesn’t work for a two-dimensional list:
a = [[1, 2],[3, 4]] b = a[:]
If I modify b, a gets modified as well.
How do I fix this?
Answers:
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Method 1
For a more general solution that works regardless of the number of dimensions, use copy.deepcopy():
import copy b = copy.deepcopy(a)
Method 2
b = [x[:] for x in a]
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