通过输入数字合并Python列表中的一些列表元素

def merge_lists(numbers, indexes):
    merged_list = []
    for i in range(len(numbers)):
        if i in indexes:
            merged_list.extend(numbers[i])
    return merged_list

numbers = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
indexes = [0, 2]
merged_list = merge_lists(numbers, indexes)
print(merged_list)

numbers = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
indexes = [0, 2]
merged_list = [numbers[i] for i in indexes]
merged_list = [item for sublist in merged_list for item in sublist]
print(merged_list)