05 Matrix修改操作

mat1[1,1] = 1000  # 不能 mat1[1][1]
print(mat1)
mat1[1:2] = 999
print('矩阵批量赋值\n',mat1)

[[   1    2]
 [   3 1000]]
矩阵批量赋值
 [[  1   2]
 [999 999]]