需要查看代碼性能，所以需要毫秒級別的打印。但是，在logging包中，查了源碼之后確認使用的是time包的datefmt。而查看Python的doc文檔，在time包中并沒有提供毫秒的datefmt，所以，只能重寫logging中取時間的函數。如下：

class Formatter(logging.Formatter):def formatTime(self, record, datefmt=None):"""Return the creation time of the specified LogRecord as formatted text.This method should be called from format() by a formatter whichwants to make use of a formatted time. This method can be overriddenin formatters to provide for any specific requirement, but thebasic behaviour is as follows: if datefmt (a string) is specified,it is used with time.strftime() to format the creation time of therecord. Otherwise, the ISO8601 format is used. The resultingstring is returned. This function uses a user-configurable functionto convert the creation time to a tuple. By default, time.localtime()is used; to change this for a particular formatter instance, set the'converter' attribute to a function with the same signature astime.localtime() or time.gmtime(). To change it for all formatters,for example if you want all logging times to be shown in GMT,set the 'converter' attribute in the Formatter class."""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)s = str(datetime.datetime.now())return s

此處，在datefmt為None的時候，使用datetime包中的時間替代。

之后，只要在實例化Formater的時候使用該類，并設置datefmt為None即可。

?formatter = Formatter(fmt, datefmt=None)

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