如何将当前日期或时间添加到文件中每行的结尾？

import os
import datetime

def add_date_to_file(input_file, output_file):
    with open(input_file, 'r') as file:
        lines = file.readlines()

    with open(output_file, 'w') as file:
        for line in lines:
            file.write(line.strip() + ' ' + str(datetime.datetime.now()) + '\n')

input_file = 'input.txt'
output_file = 'output.txt'

add_date_to_file(input_file, output_file)