python3 50个练习例子之读取日志内容并修改日期格式

最新推荐文章于 2025-01-12 14:11:33 发布

jasondyoung

最新推荐文章于 2025-01-12 14:11:33 发布

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修改日期格式 yyyy-MM-dd -> MM/dd/yyyy

import re
# log.out内容
'''
2019-06-30 14:22:11 WARN http.HttpParser:
2019-06-30 14:22:26 WARN http.HttpParser:
2019-06-30 14:22:42 WARN http.HttpParser:
2019-06-30 14:22:57 WARN http.HttpParser:
2019-06-30 14:23:12 WARN http.HttpParser:
2019-06-30 14:23:29 WARN http.HttpParser:
2019-06-30 14:23:45 WARN http.HttpParser:
2019-06-30 14:24:00 WARN http.HttpParser:
2019-06-30 14:24:15 WARN http.HttpParser:
2019-06-30 14:24:55 WARN http.HttpParser:

'''
with open('log.out',encoding="utf-8") as f:
    content = f.read() # 读取所有内容
    # r'' 原样输出 
    # \1 代表 (\d{4}) 从左到右，第一个捕获组
    # print(re.sub('(\d{4})-(\d{2})-(\d{2})',r'\2/\3/\1',content))
	# ?P<year>  给捕获组取名
	# \g<day>   获取指定名字的捕获组
    print(re.sub('(?P<year>\d{4})-(?P<month>\d{2})-(?P<day>\d{2})',r'\g<month>/\g<day>/\g<year>',content))