import logging

my_logger = logging.getLogger()#默認不傳參數為root

#將日誌寫入到文件中去
fn = logging.FileHandler("my.log")

#設置等級
fn.setLevel(logging.INFO)

#格式化輸出：異常產生時間、級別、異常消息等
formatter =  logging.Formatter(
    "時間:%(asctime)s"
    "日誌級別:%(levelname)s"
    "日誌消息:%(message)s"
    "日誌名稱:%(name)s
 
"
)
fn.setFormatter(formatter)

#生效
my_logger.addHandler(fn)


if __name__ == ‘__main__‘:
    try:
        a = 1/0
    except Exception as e:
        my_logger.error(e)

    with open("my.log","r") as f:
        print(f.read())

控制臺結果：

時間:2019-05-03 19:37:56,145日誌級別:ERROR日誌消息:division by zero日誌名稱:root

寫一個簡單日誌器<logging>