如何自定义Python日志logging的时间格式？
我是Python的日志包新手，并计划将其用于我的项目。 我想定制我的口味的时间格式。 以下是我从教程中复制的简短代码：
import logging # create logger logger = logging.getLogger("logging_tryout2") logger.setLevel(logging.DEBUG) # create console handler and set level to debug ch = logging.StreamHandler() ch.setLevel(logging.DEBUG) # create formatter formatter = logging.Formatter("%(asctime)s;%(levelname)s;%(message)s") # add formatter to ch ch.setFormatter(formatter) # add ch to logger logger.addHandler(ch) # "application" code logger.debug("debug message") logger.info("info message") logger.warn("warn message") logger.error("error message") logger.critical("critical message") 这里是输出：
2010-07-10 10:46:28,811;DEBUG;debug message 2010-07-10 10:46:28,812;INFO;info message 2010-07-10 10:46:28,812;WARNING;warn message 2010-07-10 10:46:28,812;ERROR;error message 2010-07-10 10:46:28,813;CRITICAL;critical message
我想把时间格式缩短为：' 2010-07-10 10:46:28 '，放下mili-second后缀。 我看了Formatter.formatTime，但感到困惑。 我感谢你的帮助，以实现我的目标。 谢谢。
从Formatter类的官方文档 ：
构造函数接受两个可选参数：消息格式string和date格式string。
所以改变
# create formatter formatter = logging.Formatter("%(asctime)s;%(levelname)s;%(message)s")
至
# create formatter formatter = logging.Formatter("%(asctime)s;%(levelname)s;%(message)s", "%Y-%m-%d %H:%M:%S")
使用logging.basicConfig，下面的例子适用于我：
logging.basicConfig(filename='HISTORYlistener.log',level=logging.DEBUG, format='%(asctime)s.%(msecs)03d %(levelname)s %(module)s - %(funcName)s: %(message)s', datefmt="%Y-%m-%d %H:%M:%S")
这使您可以在一行中格式化和configuration全部。 生成的日志logging如下所示：
2014-05-26 12：22：52.376 CRITICAL historylistener – main：历史logging无法启动
如果使用configuration文件logging.config.fileConfig使用类似于：
[formatter_simpleFormatter] format=%(asctime)s - %(name)s - %(levelname)s - %(message)s datefmt=%Y-%m-%d %H:%M:%S
要添加到其他答案，这里是Python文档的variables列表 。
Directive Meaning Notes %a Locale's abbreviated weekday name. %A Locale's full weekday name. %b Locale's abbreviated month name. %B Locale's full month name. %c Locale's appropriate date and time representation. %d Day of the month as a decimal number [01,31]. %H Hour (24-hour clock) as a decimal number [00,23]. %I Hour (12-hour clock) as a decimal number [01,12]. %j Day of the year as a decimal number [001,366]. %m Month as a decimal number [01,12]. %M Minute as a decimal number [00,59]. %p Locale's equivalent of either AM or PM. (1) %S Second as a decimal number [00,61]. (2) %U Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0. (3) %w Weekday as a decimal number [0(Sunday),6]. %W Week number of the year (Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0. (3) %x Locale's appropriate date representation. %X Locale's appropriate time representation. %y Year without century as a decimal number [00,99]. %Y Year with century as a decimal number. %z Time zone offset indicating a positive or negative time difference from UTC/GMT of the form +HHMM or -HHMM, where H represents decimal hour digits and M represents decimal minute digits [-23:59, +23:59]. %Z Time zone name (no characters if no time zone exists). %% A literal '%' character.
