附加到Python中的2D列表

list1 = [[1, 2], [3, 4]]
list2 = [[5, 6], [7, 8]]

# 使用extend方法将list2附加到list1
for row in list2:
    list1.extend(row)

print(list1)

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

list1 = [[1, 2], [3, 4]]
list2 = [[5, 6], [7, 8]]

# 使用extend方法将list2附加到list1
for row in list2:
    list1.append(row)

print(list1)

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