我在输出cvs文件的每一列的末尾都有不需要的逗号。如何删除它们？

import csv

def remove_trailing_commas(csv_file):
    # 读取CSV文件
    with open(csv_file, 'r') as file:
        reader = csv.reader(file)
        rows = list(reader)

    # 处理每一列
    for i in range(len(rows[0])):
        # 判断末尾是否有逗号
        if rows[-1][i].endswith(','):
            # 删除末尾逗号
            rows[-1][i] = rows[-1][i][:-1]

    # 重新写入CSV文件
    with open(csv_file, 'w', newline='') as file:
        writer = csv.writer(file)
        writer.writerows(rows)

# 调用函数，传入CSV文件路径
remove_trailing_commas('path/to/your/csv/file.csv')