如何在python中返回二维数组中元素的索引？

def find_index(arr, target):
    for i in range(len(arr)):
        for j in range(len(arr[i])):
            if arr[i][j] == target:
                return i, j
    return -1, -1

# 示例用法
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
target = 5
index = find_index(arr, target)
print("元素{}的索引为({}, {})".format(target, index[0], index[1]))

元素5的索引为(1, 1)

def find_index(arr, target):
    for i, row in enumerate(arr):
        for j, element in enumerate(row):
            if element == target:
                return i, j
    return -1, -1

# 示例用法
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
target = 5
index = find_index(arr, target)
print("元素{}的索引为({}, {})".format(target, index[0], index[1]))

元素5的索引为(1, 1)