logging

config.py

import logging

# 创建一个输出到本地的 Handler
# 首先通过 basicConfig 赋予 rootLogger 一个 StreamHandler
# 然后自定义一个 FileHandler 赋予 rootLogger
# 为什么不自定义一个 StreamHandler 再赋予 rotLogger 是因为感觉这样省事
logging.basicConfig(level=logging.DEBUG,
                        format='%(asctime)s - %(levelname)s: %(message)s')
handler = logging.FileHandler("logname.log")
handler.setLevel(logging.INFO)
handler.addFilter(lambda s: "Trigger" in s.msg) # s: LogRecord 
handler.setFormatter(
    logging.Formatter('%(asctime)s - %(levelname)s: %(message)s'))
rootLogger = logging.getLogger()
rootLogger.addHandler(handler) # add handler to root logger


def add_handler():
    "部分图片处理 log 输出到本地文件"
    name = "Image Info to File Log"
    if name in [h.name for h in logging.root.handlers]:
        return  # 已经存在了就不重复添加
    handler = logging.FileHandler("images_change.log")
    handler.set_name(name)
    handler.setLevel(logging.INFO)
    handler.addFilter(lambda s: "[RENAME]" in s.msg)  # msg 含 RENAME 时，保存到文件
    handler.setFormatter(logging.Formatter('%(asctime)s : %(message)s'))
    logging.root.addHandler(handler)  # add handler to root logger
    logging.debug("add log handler '%s' to '%s'", handler.name,
                  logging.root.name)

reference.py

from logging import getLogger, FileHandler, StreamHandler, INFO, basicConfig
basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
            handlers=[FileHandler('log.txt'), StreamHandler()],
            level=INFO)
LOGGER = getLogger(__name__)