如何将不同大小的子数组存储到一个二维数组中

# 创建一个不规则的二维数组
irregular_2d_array = [
    [1, 2, 3],
    [4, 5],
    [6, 7, 8, 9]
]

# 打印二维数组
for row in irregular_2d_array:
    print(row)

for row in irregular_2d_array:
    for element in row:
        # 处理每个元素
        print(element)

total_sum = 0
for row in irregular_2d_array:
    for element in row:
        total_sum += element
print("总和:", total_sum)

search_element = 7
found = False
for row in irregular_2d_array:
    if search_element in row:
        found = True
        break
if found:
    print(f"找到元素 {search_element}")
else:
    print(f"未找到元素 {search_element}")