题解 | #牛牛的矩阵相加#
牛牛的矩阵相加
https://www.nowcoder.com/practice/730b90507602412fac90a3f106bfa0cd
主要是体会二维数组遍历时，迭代器成员和指针下标的微妙变化
#方法一
# num = int(input())# matrix = [[1,2,3],[4,5,6],[7,8,9]]
# new_list = []
# new_matrix = []
# for i in matrix:
# for j in i:
# j = j * num
# new_list.append(j)
# new_matrix.append(new_list)
# new_list = []
# print(new_matrix)
#方法二
# num = int(input())
# matrix = [[1,2,3],[4,5,6],[7,8,9]]
# new_list = []
# new_matrix = []
# for i in matrix:
# for j in i:
# new_list = [j*num for j in i]
# new_matrix.append(new_list)
# print(new_matrix)
#方法三
# num = int(input())
# matrix = [[1,2,3],[4,5,6],[7,8,9]]
# for i in matrix:
# for j in range(len(i)):
# i[j] = i[j]*num
# print(matrix)
#方法四
# num = int(input())
# matrix = [[1,2,3],[4,5,6],[7,8,9]]
# for i in range(len(matrix)):
# for j in range(len(matrix[i])):
# matrix[i][j] = matrix[i][j]*num
# print(matrix)
