Python csv编写器自动舍入时间

import csv
from datetime import datetime, timedelta

# 定义需要写入CSV的数据
data = [
    ['2019-01-01 12:34:56.789', 100],
    ['2019-01-01 12:35:06.123', 200],
    ['2019-01-01 12:35:16.456', 300]
]

# 打开CSV文件进行写入
with open('data.csv', 'w', newline='') as file:
    writer = csv.writer(file)

    for row in data:
        # 将时间字符串转换为datetime对象
        time_str = row[0]
        time_obj = datetime.strptime(time_str, '%Y-%m-%d %H:%M:%S.%f')

        # 将时间按照精度进行舍入（这里以秒为精度）
        rounded_time = time_obj.replace(microsecond=0)

        # 将舍入后的时间重新转换为字符串
        rounded_time_str = rounded_time.strftime('%Y-%m-%d %H:%M:%S')

        # 更新数据行中的时间值
        row[0] = rounded_time_str

        # 写入数据行到CSV文件
        writer.writerow(row)

print("写入完成")