l = [1,2,3]
l2 = l
l[0] = 2
print(l)
print(l2)
実行結果
[2, 2, 3]
[2, 2, 3]
l2の値まで変わってしまっている。
これを避けるためにはcopyモジュールを使う。
import copy
l = [1,2,3]
l2 = copy.copy(l)
l[0] = 2
print(l)
print(l2)
実行結果
[2, 2, 3]
[1, 2, 3]
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