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我想复制一个二维列表,这样如果我修改一个列表,另一个不会被修改。
对于一维列表,我只是这样做:
a = [1, 2] b = a[:]
现在如果我修改b,a不会被修改。
b
a
但这不适用于二维列表:
a = [[1, 2],[3, 4]] b = a[:]
如果我修改b,a也会被修改。
我该如何解决?
对于更通用的解决方案,无论维度数量如何,请使用copy.deepcopy():
copy.deepcopy()
import copy b = copy.deepcopy(a)
b = [x[:] for x in a]