如何在csv文件中插入数组连接？

import csv

def insert_array_concatenation(csv_file, column_index, array):
    # 读取CSV文件到二维数组
    with open(csv_file, 'r') as file:
        reader = csv.reader(file)
        data = [row for row in reader]

    # 创建新的数组用于存储插入数组连接后的结果
    new_data = []

    # 遍历原始的二维数组
    for row in data:
        # 对于需要插入的列，将数组连接操作应用于特定的列
        if column_index < len(row):
            row[column_index] += ','.join(array)
        new_data.append(row)

    # 将新的数组写入到CSV文件中
    with open(csv_file, 'w', newline='') as file:
        writer = csv.writer(file)
        writer.writerows(new_data)

# 示例用法
csv_file = 'data.csv'
column_index = 2
array = ['value1', 'value2', 'value3']

insert_array_concatenation(csv_file, column_index, array)