如何在Python中打印/返回矩阵中所有值的总和？

def matrix_sum(matrix):
    total = 0
    for row in matrix:
        for element in row:
            total += element
    return total

# 示例矩阵
matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

# 计算总和
result = matrix_sum(matrix)
print("矩阵的总和是:", result)

def matrix_sum(matrix):
    return sum(sum(row) for row in matrix)

# 示例矩阵与计算总和同上

import numpy as np

def matrix_sum(matrix):
    return np.sum(matrix)

# 示例矩阵
matrix = np.array([
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
])

# 计算总和
result = matrix_sum(matrix)
print("矩阵的总和是:", result)