如何使用python从日志文件(文本文件)中检索开始时间和结束时间

import re
from datetime import datetime

def retrieve_start_end_time(log_file_path):
    start_time = None
    end_time = None

    with open(log_file_path, 'r') as file:
        lines = file.readlines()

        for line in lines:
            # 此处使用正则表达式来匹配开始时间和结束时间的格式
            match = re.search(r'Start Time: (\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})', line)
            if match:
                start_time = datetime.strptime(match.group(1), '%Y-%m-%d %H:%M:%S')

            match = re.search(r'End Time: (\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})', line)
            if match:
                end_time = datetime.strptime(match.group(1), '%Y-%m-%d %H:%M:%S')

    return start_time, end_time

# 示例用法
log_file_path = 'path/to/log_file.txt'
start_time, end_time = retrieve_start_end_time(log_file_path)

if start_time and end_time:
    print('开始时间:', start_time)
    print('结束时间:', end_time)
else:
    print('未找到开始时间和结束时间')