tl;dr给那些在这里寻找ISO格式日期的人:

而不是使用'%Y-%m-%d %H:% m:%S。%03d%z'，按@unutbu指示创建自己的类。下面是iso date格式:

import logging
from time import gmtime, strftime

class ISOFormatter(logging.Formatter):
    def formatTime(self, record, datefmt=None):
        t = strftime("%Y-%m-%dT%H:%M:%S", gmtime(record.created))
        z = strftime("%z",gmtime(record.created))
        s = "%s.%03d%s" % (t, record.msecs,z)        
        return s

logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)

console = logging.StreamHandler()
logger.addHandler(console)

formatter = ISOFormatter(fmt='%(asctime)s - %(module)s - %(levelname)s - %(message)s')
console.setFormatter(formatter)

logger.debug('Jackdaws love my big sphinx of quartz.')
#2020-10-23T17:25:48.310-0800 - <stdin> - DEBUG - Jackdaws love my big sphinx of quartz.

我想出了一个双行程序，让Python日志模块输出RFC 3339 (ISO 1801兼容)格式的时间戳，有正确格式化的毫秒和时区，并且没有外部依赖:

import datetime
import logging

# Output timestamp, as the default format string does not include it
logging.basicConfig(format="%(asctime)s: level=%(levelname)s module=%(module)s msg=%(message)s")

# Produce RFC 3339 timestamps
logging.Formatter.formatTime = (lambda self, record, datefmt=None: datetime.datetime.fromtimestamp(record.created, datetime.timezone.utc).astimezone().isoformat())

例子:

>>> logging.getLogger().error("Hello, world!")
2021-06-03T13:20:49.417084+02:00: level=ERROR module=<stdin> msg=Hello, world!

或者，最后一行可以写成这样:

def formatTime_RFC3339(self, record, datefmt=None):
    return (
        datetime.datetime.fromtimestamp(record.created, datetime.timezone.utc)
        .astimezone()
        .isoformat()
    )

logging.Formatter.formatTime = formatTime_RFC3339

该方法也可以用于特定的格式化程序实例，而不是在类级别上重写，在这种情况下，您将需要从方法签名中删除self。

我找到的最简单的方法是覆盖default_msec_format:

formatter = logging.Formatter('%(asctime)s')
formatter.default_msec_format = '%s.%03d'

到目前为止，下面的代码与python3完全兼容。

         logging.basicConfig(level=logging.DEBUG,
                     format='%(asctime)s %(levelname)-8s %(message)s',
                     datefmt='%Y/%m/%d %H:%M:%S.%03d',
                     filename=self.log_filepath,
                     filemode='w')

给出以下输出

2020/01/11 18:51:19.011信息

实例化Formatter后，我通常设置Formatter。Converter = gmtime。所以为了让@unutbu的答案在这种情况下工作，你需要:

class MyFormatter(logging.Formatter):
    def formatTime(self, record, datefmt=None):
        ct = self.converter(record.created)
        if datefmt:
            s = time.strftime(datefmt, ct)
        else:
            t = time.strftime("%Y-%m-%d %H:%M:%S", ct)
            s = "%s.%03d" % (t, record.msecs)
        return s

如果你用箭头或者不介意用箭头的话。你可以用python的时间格式代替arrow的时间格式。

import logging

from arrow.arrow import Arrow


class ArrowTimeFormatter(logging.Formatter):

    def formatTime(self, record, datefmt=None):
        arrow_time = Arrow.fromtimestamp(record.created)

        if datefmt:
            arrow_time = arrow_time.format(datefmt)

        return str(arrow_time)


logger = logging.getLogger(__name__)

default_handler = logging.StreamHandler()
default_handler.setFormatter(ArrowTimeFormatter(
    fmt='%(asctime)s',
    datefmt='YYYY-MM-DD HH:mm:ss.SSS'
))

logger.setLevel(logging.DEBUG)
logger.addHandler(default_handler)

现在你可以在datefmt属性中使用箭头的所有时间格式。