python 的log格式

renheshi

• log.py
  

import logging
import logging.handlers
import os
def init_log(log_path, level=logging.INFO, when="D", backup=7,
format='%(asctime)s:[%(levelname)s][%(threadName)s] %(filename)s:%(lineno)d --> %(message)s',
datefmt='%Y-%m-%d %H:%M:%S'):
"""
init_log - initialize log module
Args:
log_path      - Log file path prefix.
Log data will go to two files: log_path.log and log_path.log.wf
Any non-exist parent directories will be created automatically
level         - msg above the level will be displayed
DEBUG < INFO < WARNING < ERROR < CRITICAL
the default value is logging.INFO
when          - how to split the log file by time interval
'S' : Seconds
'M' : Minutes
'H' : Hours
'D' : Days
'W' : Week day
default value: 'D'
format        - format of the log
default format:
%(levelname)s: %(asctime)s: %(filename)s:%(lineno)d * %(thread)d %(message)s
INFO: 12-09 18:02:42: log.py:40 * 139814749787872 HELLO WORLD
backup        - how many backup file to keep
default value: 7
Raises:
OSError: fail to create log directories
IOError: fail to open log file
"""
formatter = logging.Formatter(format, datefmt)
logger = logging.getLogger()
logger.setLevel(level)
# add console log
consoleHandler = logging.StreamHandler()
consoleHandler.setLevel(level)
consoleHandler.setFormatter(formatter)
logger.addHandler(consoleHandler)
log_dir = os.path.dirname(log_path)
if not os.path.isdir(log_dir):
os.makedirs(log_dir)
handler = logging.handlers.TimedRotatingFileHandler(log_path + '.log',
when=when,
backupCount=backup)
handler.setLevel(level)
handler.setFormatter(formatter)
logger.addHandler(handler)

• 你可以把上面的代码拷贝到自己的项目中。在程序初始化时，调用init_log即可使日志打印符合规范
  

import log
def main():
log.init_log("./log/my_program")  # 日志保存到./log/my_program.log和./log/my_program.log.wf，按天切割，保留7天
logging.info("Hello World!!!")




　　参考
　　*logging — Logging facility for Python