基础

简单控制台打印

import logging
logging.basicConfig()
logging.debug('This is a debug message')
logging.info('This is an info message')
logging.warning('This is a warning message')
logging.error('This is an error message')
logging.critical('This is a critical message')

简单写入文件

import logging
logging.basicConfig(filename="test.log", filemode="w", format="%(asctime)s %(name)s:%(levelname)s:%(message)s", datefmt="%d-%M-%Y %H:%M:%S", level=logging.DEBUG)
logging.debug('This is a debug message')

文件生成内容如下：

13-10-18 21:10:32 root:DEBUG:This is a debug message

进阶

logging库和rich库组合

import logging
try:
    from rich.logging import RichHandler
    handler = RichHandler(show_path=False, show_time=False)
    logging.basicConfig(
        level=logging.INFO, handlers=[handler], format="%(message)s", force=True
    )
except ImportError:
    logging.basicConfig(level=logging.INFO, format="%(levelname)s\t %(message)s", force=True)

同时输出屏幕和文件

from datetime import datetime
from pathlib import Path
import logging
from rich.logging import RichHandler

Path("log").mkdir(exist_ok=True)
rich_handler = RichHandler(show_path=False, show_time=False, level=logging.INFO)
file_handler = logging.FileHandler(
    "log/{}.log".format(datetime.now().strftime("%Y-%m-%d %H:%M:%S")), "w"
)
file_handler.setLevel(logging.ERROR)
logging.basicConfig(
    level=logging.INFO,
    handlers=[rich_handler, file_handler],
    format="%(message)s",
    force=True,
)

关闭第三方库的日志

import logging
httpx_logger=logging.getLogger("httpx")
httpx_logger.setLevel(logging.CRITICAL)	#通过调高警报等级来取消
httpx_logger.propagate = False		 #也可以直接取消

附录：format参数的可选变量

注意不要漏了末尾的s