同时输出到前台和文件（滚动覆盖）
import os
import logging
import time
from logging.handlers import RotatingFileHandler
def login(mm):
log = logging.getLogger()
log.setLevel(logging.NOTSET)
rq = time.strftime('%Y%m%d%H%M', time.localtime(time.time()))
log_path = os.path.dirname(os.getcwd()) + '/Logs/'
log_name = log_path + 'log.log'
logfile = log_name
# fsc = logging.FileHandler(logfile, mode='w') # 不循环回滚日志
fsc = RotatingFileHandler(logfile, maxBytes=1, backupCount=2) # 循环回滚日志，最大1kb，最多保留2个备份
fsc.setLevel(logging.NOTSET)
ch = logging.StreamHandler() # 创建输出到前台的handler
ch.setLevel(logging.NOTSET) # 定义日志显示级别为无级别
formatter = logging.Formatter("%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s:%(message)s")
fsc.setFormatter(formatter)
ch.setFormatter(formatter)
log.addHandler(fsc)
log.addHandler(ch)
log.debug(mm)
# log.info('this is a logger info message')
# log.warning('this is a logger warning message')
# log.error('this is a logger error message')
# log.critical('this is a logger critical message')
