Python将字符串转换为datetime

有这样一些字符串：

'1710903685'
'20240320110125'
'2024-03-20 11:01:25'

要转换成Python的datetime

代码如下：

import functools
import re
from datetime import datetime, timedelta
from typing import Union# pip install python-dateutil
from dateutil import parserdef convert_zone(func):@functools.wraps(func)def deco(*args, **kw):is_utc = kw.pop("is_utc", False)v = func(*args, **kw)if is_utc:v += timedelta(hours=8)return vreturn deco@convert_zone
def parse_time(s: Union[int, float, str], *, is_utc=False) -> datetime:"""将字符串或数值转换为datetimeUsage::>>> from datetime import datetime>>> parse_time(1710903685)datetime.datetime(2024, 3, 20, 11, 1, 25)>>> parse_time('1710903685')datetime.datetime(2024, 3, 20, 11, 1, 25)>>> parse_time('2024-03-20 11:01:25')datetime.datetime(2024, 3, 20, 11, 1, 25)>>> parse_time('20240320110125')datetime.datetime(2024, 3, 20, 11, 1, 25)>>> parse_time('20240320110125', is_utc=True)datetime.datetime(2024, 3, 20, 19, 1, 25)>>> parse_time(1710903685) == parse_time('1710903685') == parse_time('2024-03-20 11:01:25') == datetime(2024, 3, 20, 11, 1, 25)True>>> parse_time(1710903685.780527) == parse_time('1710903685.780527') == parse_time('2024-03-20 11:01:25.780527') == datetime(2024, 3, 20, 11, 1, 25, 780527)True>>> now = datetime.now()>>> timestamp = now.timestamp()>>> parse_time(str(now)) == now == parse_time(str(timestamp)) == parse_time(timestamp)True>>> try:...     parse_time('invalid time')... except ValueError as e:...     print(e)...Can't parse s='invalid time' to datetime"""if isinstance(s, (int, float)):return datetime.fromtimestamp(s)if s.isdigit():try:return datetime.fromtimestamp(int(s))except ValueError:passif re.match(r"\d+\.\d+$", s):return datetime.fromtimestamp(float(s))try:return parser.parse(s)except parser.ParserError as e:raise ValueError(f"Can't parse {s=} to datetime") from edef _test():import doctestdoctest.testmod(verbose=True)if __name__ == "__main__":  # pragma: no cover_test()

函数和单元测试都写好后，发现有些字符串是UTC时间，于是增加了装饰器和is_utc参数来转成北京时间.

单元测试结果如下：