different formatter depends on logging level

Python中记录日志的时候, 希望不同level的日志使用不同的format, 比如INFO以上级别的, 就简单记录一下msg, DEBUG的还要记录一下文件名, 函数名, 行号等信息.

但是翻阅了一下官方文档, 以及搜索了不少资料, 都没能简单的找到答案, 最后一点点线索拼凑出来了我需要的效果.

import logging
import logging.handlers
import logging.config

def initlog():
    class MyFormatter(logging.Formatter):

        def format(self, record):
            dformatter = '%(levelname)s: [%(asctime)s] - %(pathname)s %(lineno)d - %(message)s'
            formatter = '%(levelname)s: [%(asctime)s] - %(message)s'
            if record.levelno <= logging.DEBUG:
                self._fmt = dformatter
            else:
                self._fmt = formatter
            return super(MyFormatter, self).format(record)

    config = {
        "version": 1,
        "disable_existing_loggers": True,
        "formatters": {
            "custom": {
                '()': MyFormatter,
            }
        },
        "handlers": {
            "console": {
                "class": "logging.StreamHandler",
                "level": "DEBUG",
                "formatter": "custom",
                "stream": "ext://sys.stdout"
            },
            "file_handler": {
                "class": "logging.handlers.RotatingFileHandler",
                "level": "DEBUG",
                "formatter": "custom",
                "filename": "app.log"
            }
        },
        'root': {
            'level': level,
            'handlers': ['console']
        },
        "loggers": {
            "myloger": {
                "level": level,
                "handlers": [
                    "file_handler"
                ]
            }
        }
    }
    logging.config.dictConfig(config)


initlog()
logging.debug("debug") # write to console
logger = logging.getLogger("myloger")
logger.debug("debug") # write to console and file
logger.error("error") # write to console and file

如果需要传自定义参数到MyFormatter里面, 可参考

    class MyFormatter(logging.Formatter):

        def __init__(self, args):
            super(MyFormatter, self).__init__()
            print args

        def format(self, record):
            dformatter = '%(levelname)s: [%(asctime)s] - %(pathname)s %(lineno)d - %(message)s'
            formatter = '%(levelname)s: [%(asctime)s] - %(message)s'
            if record.levelno <= logging.DEBUG:
                self._fmt = dformatter
            else:
                self._fmt = formatter
            return super(MyFormatter, self).format(record)

        ....

        "formatters": {
            "custom": {
                '()': MyFormatter,
                'args': 1
            },

        ....