如何使用嵌套循环反转此模式？

def reverse_pattern(pattern):
    rows = len(pattern)
    cols = len(pattern[0])
    reversed_pattern = []

    for i in range(rows):
        reversed_row = []
        for j in range(cols-1, -1, -1):
            reversed_row.append(pattern[i][j])
        reversed_pattern.append(reversed_row)

    return reversed_pattern

# 示例模式
pattern = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

reversed_pattern = reverse_pattern(pattern)
print(reversed_pattern)

[[3, 2, 1], [6, 5, 4], [9, 8, 7]]