多层列表访问
牛牛的矩阵相加
https://www.nowcoder.com/practice/730b90507602412fac90a3f106bfa0cd
list1 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
n = int(input())
for i in list1:
for j in range(len(i)):
i[j] = n * i[j]
print(list1)
牛牛的矩阵相加
https://www.nowcoder.com/practice/730b90507602412fac90a3f106bfa0cd
list1 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
n = int(input())
for i in list1:
for j in range(len(i)):
i[j] = n * i[j]
print(list1)
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