最近写一个工程Logging模块一直出现奇怪bug调了一整天，特此记录logging的主要使用方法和一些debug。

基本用法

logging一般为输出到屏幕，和输出到文件两种用法。
最常用的配置方式为logging.basicConfig()

import logging

logging.basicConfig( # 配置日志的输出方式及格式
  level=logging.DEBUG,
  filename='log.txt',
  filemode='a',
  format='%(asctime)s %(filename)s %(message)s',
)

logging.info('[INFO]:calling method i() in h()')
logging.error('[Error]:Soory,Exception occured')
logging.debug()
logging.setLevel()
logging.addFilter()

其中logging.setLevel有五个级别，只输出所设定级别及以上的信息

配置handler

另一种使用方式可以更自由，即句柄配置

def setup_logging(folder_path,filename):
    """Create and init logger.  
    Args:
        logfolder_path:  "/log/"
        filename:        "Alien-phi-0.001-mu-14.txt"
    Return:
        logger:           
    """
    logfile = os.path.join(folder_path, filename)
    logging.basicConfig(
        level = logging.INFO,
        format ='%(asctime)s - %(levelname)s - %(message)s',
        datefmt = '%y-%m-%d %H:%M',
        filename = logfile,
        filemode = 'a')
  
    filehandler = logging.FileHandler(logfile,encoding='utf-8')

    logger = logging.getLogger()
    logger.addHandler(filehandler)

    return logger

if __name__ == "__main__":

    fold = os.getcwd()
    filename = "1.log"
    logger = setup_logging(fold,filename)
    logger.info("test")