无法在If语句中检索或存储二维数组位置

target_value = '目标值'
row_index = -1
col_index = -1

for i in range(len(array)):
    for j in range(len(array[i])):
        if array[i][j] == target_value:
            row_index = i
            col_index = j
            break

if row_index != -1 and col_index != -1:
    print("目标值位置：行", row_index, "列", col_index)
else:
    print("目标值不存在")

target_value = '目标值'
positions = []

for i in range(len(array)):
    for j in range(len(array[i])):
        if array[i][j] == target_value:
            positions.append((i, j))

if len(positions) > 0:
    print("目标值位置：", positions)
else:
    print("目标值不存在")