这也应该工作：
logging.Formatter(fmt='%(asctime)s.%(msecs)03d',datefmt='%Y-%m-%d,%H:%M:%s')
logging.Formatter的formatTime方法如下所示：
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
请注意中的逗号"%s,%03d"。不能通过指定a来解决此问题，datefmt因为cta是，time.struct_time并且这些对象不记录毫秒。
如果我们更改的定义ct以使其成为datetime对象而不是struct_time，那么（至少在现代版本的Python中）可以调用ct.strftime，然后可以用来%f设置微秒的格式：
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，要获得毫秒数，请将逗号更改为小数点，然后省略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.
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