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'

使用这个智能答案的时区和选择的答案，你可以用你想要的格式构建毫秒和时区:

import logging
import time

if __name__ == "__main__":
    tz = time.strftime('%z')
    logging.basicConfig(
        format=(
            "%(asctime)s.%(msecs)03d" + tz + " %(levelname)s "
            "%(pathname)s:%(lineno)d[%(threadName)s]: %(message)s"
        ),
        level=logging.DEBUG,
        datefmt="%Y-%m-%dT%H:%M:%S",
    )
    logging.info("log example")

就我个人而言，我喜欢以UTC格式保存所有日志，但在日志中显式地将其作为没有时区的datetime，这在多区域应用程序中是没有意义的:

    logging.Formatter.converter = time.gmtime
    logging.basicConfig(
        format=(
            "%(asctime)s.%(msecs)03d+0000 %(levelname)s "
            "%(pathname)s:%(lineno)d[%(threadName)s]: %(message)s"
        ),
        level=logging.DEBUG,
        datefmt="%Y-%m-%dT%H:%M:%S",
    )

请注意克雷格·麦克丹尼尔的解决方案显然更好。

日志记录。Formatter的formatTime方法看起来像这样:

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

注意“%s，%03d”中的逗号。这不能通过指定一个datefmt来解决，因为ct是一个时间。Struct_time和这些对象不记录毫秒。

如果我们改变ct的定义，使其成为一个datetime对象而不是struct_time对象，那么(至少在现代版本的Python中)我们可以调用ct。Strftime，然后我们可以使用%f格式化微秒:

import logging
import datetime as dt

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

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

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

formatter = MyFormatter(fmt='%(asctime)s %(message)s',datefmt='%Y-%m-%d,%H:%M:%S.%f')
console.setFormatter(formatter)

logger.debug('Jackdaws love my big sphinx of quartz.')
# 2011-06-09,07:12:36.553554 Jackdaws love my big sphinx of quartz.

或者，为了获得毫秒，将逗号改为小数点，并省略datefmt参数:

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

...
formatter = MyFormatter(fmt='%(asctime)s %(message)s')
...
logger.debug('Jackdaws love my big sphinx of quartz.')
# 2011-06-09 08:14:38.343 Jackdaws love my big sphinx of quartz.

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。

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