如何用特定范围的随机数填充矩阵的列？

import random

def fill_matrix_with_random_numbers(matrix, lower_bound, upper_bound):
    rows = len(matrix)
    cols = len(matrix[0])
    
    for col in range(cols):
        for row in range(rows):
            matrix[row][col] = random.randint(lower_bound, upper_bound)
    
    return matrix

# 示例用法
m = 3  # 矩阵的行数
n = 4  # 矩阵的列数
a = 1  # 随机数的下界
b = 10  # 随机数的上界

matrix = [[0] * n for _ in range(m)]  # 创建一个m行n列的矩阵
filled_matrix = fill_matrix_with_random_numbers(matrix, a, b)

print(filled_matrix)