Python logging模块实战：从基础配置到多模块日志管理

import logging # 引入logging模块
logging.basicConfig(level=logging.NOTSET) # 设置日志级别
logging.debug(u"如果设置了日志级别为NOTSET,那么这里可以采取debug、info的级别的内容也可以显示在控制台上了")

import logging # 引入logging模块
logging.basicConfig(level=logging.DEBUG,
          format='%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s: %(message)s') # logging.basicConfig函数对日志的输出格式及方式做相关配置
# 由于日志基本配置中级别设置为DEBUG，所以一下打印信息将会全部显示在控制台上
logging.info('this is a loggging info message')
logging.debug('this is a loggging debug message')
logging.warning('this is loggging a warning message')
logging.error('this is an loggging error message')
logging.critical('this is a loggging critical message')

import logging # 引入logging模块
import os.path
import time
# 第一步，创建一个logger
logger = logging.getLogger()
logger.setLevel(logging.INFO) # Log等级总开关
# 第二步，创建一个handler，用于写入日志文件
rq = time.strftime('%Y%m%d%H%M', time.localtime(time.time()))
log_path = os.path.dirname(os.getcwd()) + '/Logs/'
log_name = log_path + rq + '.log'
logfile = log_name
fh = logging.FileHandler(logfile, mode='w')
fh.setLevel(logging.DEBUG) # 输出到file的log等级的开关
# 第三步，定义handler的输出格式
formatter = logging.Formatter("%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s: %(message)s")
fh.setFormatter(formatter)
# 第四步，将logger添加到handler里面
logger.addHandler(fh)
# 日志
logger.debug('this is a logger debug message')
logger.info('this is a logger info message')
logger.warning('this is a logger warning message')
logger.error('this is a logger error message')
logger.critical('this is a logger critical message')

ch = logging.StreamHandler()
ch.setLevel(logging.WARNING) # 输出到console的log等级的开关

ch.setFormatter(formatter)
logger.addHandler(ch)

import os.path
import time
import logging
# 创建一个logger
logger = logging.getLogger()
logger.setLevel(logging.INFO) # Log等级总开关

# 创建一个handler，用于写入日志文件
rq = time.strftime('%Y%m%d%H%M', time.localtime(time.time()))
log_path = os.path.dirname(os.getcwd()) + '/Logs/'
log_name = log_path + rq + '.log'
logfile = log_name
fh = logging.FileHandler(logfile, mode='w')
fh.setLevel(logging.DEBUG) # 输出到file的log等级的开关

# 定义handler的输出格式
formatter = logging.Formatter("%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s: %(message)s")
fh.setFormatter(formatter)
logger.addHandler(fh)
# 使用logger.XX来记录错误,这里的"error"可以根据所需要的级别进行修改
try:
  open('/path/to/does/not/exist', 'rb')
except (SystemExit, KeyboardInterrupt):
  raise
except Exception, e:
  logger.error('Failed to open file', exc_info=True)

import logging
def write_warning():
  logging.warning(u"记录文件warning_output.py的日志")

import logging
def write_error():
  logging.error(u"记录文件error_output.py的日志")

import logging
import warning_output
import error_output
def write_critical():
  logging.critical(u"记录文件main.py的日志")


warning_output.write_warning() # 调用warning_output文件中write_warning方法
write_critical()
error_output.write_error() # 调用error_output文件中write_error方法

# coding:utf-8
import logging
import time
import re
from logging.handlers import TimedRotatingFileHandler
from logging.handlers import RotatingFileHandler


def backroll():
  #日志打印格式
  log_fmt = '%(asctime)s\tFile \"%(filename)s\",line %(lineno)s\t%(levelname)s: %(message)s'
  formatter = logging.Formatter(log_fmt)
  #创建TimedRotatingFileHandler对象
  log_file_handler = TimedRotatingFileHandler(filename="ds_update", when="M", interval=2, backupCount=2)
  #log_file_handler.suffix = "%Y-%m-%d_%H-%M.log"
  #log_file_handler.extMatch = re.compile(r"^\d{4}-\d{2}-\d{2}_\d{2}-\d{2}.log$")
  log_file_handler.setFormatter(formatter)
  logging.basicConfig(level=logging.INFO)
  log = logging.getLogger()
  log.addHandler(log_file_handler)
  #循环打印日志
  log_content = "test log"
  count = 0
  while count < 30:
    log.error(log_content)
    time.sleep(20)
    count = count + 1
  log.removeHandler(log_file_handler)


if __name__ == "__main__":
  backroll()