csv 如何将txt文件转换成csv文件

import csv
def convert_txt_to_csv(out_file_path, input_file_path, txt_sep):  #定义输出路径，输入文件路径，txt的分隔符
    with open("./temp.csv", "w", newline = "") as csv_file:
        writer = csv.writer(csv_file)
        mark = 0
        with open(temp_path) as f:
            for l in f:
                row = l.split(txt_sep)         #txt的分割名为
                if(mark==0):
                    header = range(len(row))
                    writer.writerow(header)  #写入列名
                    mark = 1

                writer.writerow(row)