如何按照 CSV 文件行内指定数据排序并写入？

with open("西北地区省级行政区人口.csv", mode="r", encoding="u8") as f:    sorted_list = sorted([_.replace("", "") for _ in f.readlines()], key=lambda row: int(row.split(",")[-1]))with open("西北地区省级行政区人口(按照人口排序).csv", mode="w", encoding="u8") as f:    f.write("".join(sorted_list))