Python 限制日志大小的两种方案：RotatingFileHandler 与挂载文件

class logging.handlers.RotatingFileHandler(filename, mode=‘a', maxBytes=0, backupCount=0, encoding=None, delay=False)

import logging
from logging.handlers import RotatingFileHandler
log = logging.getLogger()
handler = RotatingFileHandler("test", "a", 4096, 2, "utf-8")
log.addHandler(handler)
#更高级的logging特性
log.setLevel(logging.INFO) #设置过滤的日志等级
formatter = logging.Formatter("%(asctime)s %(levelname)s: %(message)")
log.setFormatter(formatter) #设置日志输出的格式

dd if=/dev/zero of=./logfs bs=1M count=4
mkfs.ext4 ./logfs

mkdir log
sudo mount -t ext4 ./logfs ./log
python test.py 2>./log/test.log

# coding=utf-8
import logging
import datetime
import os
CONSOLE = True
LEVEL = "DEBUG"
# log/2020-09/2020-09-27_APPLICATION_NAME.log
APPLICATION_NAME = "APPLICATION_NAME"
# 只生成GBK的日志文件
class RecordLog:
 def __init__(self):
  """
  1、控制日志是否在控制台中打印
  2、控制日志输出的级别
  """
  # 设置是否控制台打印
  self._console = CONSOLE
  # 等级字典
  self._level_dict = {'DEBUG':1,'INFO':2,'WARNING':3,'ERROR':4,'CRITICAL':5}
  # 设置当前支持的日志等级
  self._current_level_num = self._level_dict[LEVEL]
 def get_log_file_name(self,):
  """
  创建日志文件夹，创建或调用日志文件,日志存储
  :return: log/log_folder(月份)/log_file（每天的log）
  """
  now = str(datetime.datetime.now())
  log_folder = now[:7]
  log_file = now[:10] + "_" + APPLICATION_NAME + ".log"
  if os.path.exists("log/" + log_folder):
   pass
  else:
   os.makedirs("log/" + log_folder)
  return "log/" + log_folder + "/" + log_file
 def log_content(self, content='开始记录',level="DEBUG"):
  """
  记录日志
  :param content: 记录的内容
  :param level: DEBUG, INFO, WARNING, ERROR, CRITICAL
  :return:
  """
  LOG_FILE_NAME = self.get_log_file_name()
  now1 = datetime.datetime.now()
  now_date = now1.strftime("%Y-%m-%d-%H:%M:%S")
  text = " %s %s -- %s" % (level, now_date, content)
  if level in ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']:
   level_num = self._level_dict[level]
   # 控制台输出
   if self._console:
    print(text)
   logger = logging.getLogger()
   fh = logging.FileHandler(filename=LOG_FILE_NAME, encoding="utf-8", mode="a")
   # formatter = logging.Formatter("%(asctime)s - %(name)s-%(levelname)s %(message)s")
   # fh.setFormatter(formatter)
   logger.addHandler(fh)
   # 设置日志等级
   if "DEBUG" == level and level_num >= self._current_level_num:
    logger.setLevel(logging.DEBUG)
   elif "INFO" == level and level_num >= self._current_level_num:
    logger.setLevel(logging.INFO)
   elif "WARNING" == level and level_num >= self._current_level_num:
    logger.setLevel(logging.WARNING)
   elif "ERROR" == level and level_num >= self._current_level_num:
    logger.setLevel(logging.ERROR)
   else:
    logger.setLevel(logging.CRITICAL)
   logger.info(text)
  else:
   raise Exception('日志等级传参错误： %s ; 正确格式为：DEBUG, INFO, WARNING, ERROR, CRITICAL'%level)
if __name__ == '__main__':
 #
 log = RecordLog()
 log.log_content(level='DEBUG')