如何让日志显示调用Logger的文件行号而非Logger自身文件的行号？

我自定义了Logger类，日志格式如下：

log_format = "%(asctime)s.%(msecs)d %(levelname)-8s [%(processName)s] [%(threadName)s] %(filename)s:%(lineno)d --- %(message)s"

项目目录结构：

.
├── exceptions.py
├── logger.py
├── settings.py
└── main.py

在main.py中通过Logger.info("Transcribed audio successfully.")调用日志，但日志输出里的filename和lineno始终指向logger.py：

2023-02-15 10:48:06,241.241 INFO     [MainProcess] [MainThread] logger.py:38 --- Transcribed audio successfully.

期望日志显示调用方的文件和行号：

2023-02-15 10:48:06,241.241 INFO     [MainProcess] [MainThread] main.py:98 --- Transcribed audio successfully.

当前logger.py代码：

import logging
from logging.handlers import RotatingFileHandler


class Logger:
    log_format = "%(asctime)s.%(msecs)d %(levelname)-8s [%(processName)s] [%(threadName)s] %(filename)s:%(lineno)d --- %(message)s"

    @staticmethod
    def setup_single_logger(name, logfile, level):
        handler = RotatingFileHandler(logfile, mode='a', maxBytes=1024 * 1024, backupCount=10)
        handler.setFormatter(logging.Formatter(Logger.log_format))
        logger = logging.getLogger(name)
        logger.setLevel(level)
        logger.addHandler(handler)
        return logger

    @staticmethod
    def setup_logging():
        Logger.info_logger = Logger.setup_single_logger('INFO', '/path/to/your/logfile.log', logging.INFO)

    @staticmethod
    def info(msg, *args, **kwargs):
        Logger.info_logger.info(msg, *args, **kwargs)


Logger.setup_logging()

main.py示例代码：

from logger import Logger

Logger.info("Transcribed audio successfully.")

问题根源是：Logger.info作为静态方法，调用info_logger.info时，日志模块会捕获当前栈帧（即logger.py中info方法的行号），而非实际调用Logger.info的位置。需要让日志模块跳过当前栈层级，定位到真正的调用方。

方法1：使用Python 3.8+的stacklevel参数（推荐） #

Python 3.8及以上版本的日志模块支持stacklevel参数，指定要跳过的栈层级数。修改Logger.info方法如下：

@staticmethod
def info(msg, *args, **kwargs):
    # stacklevel=2 表示跳过当前方法的栈帧，直接获取调用者的信息
    Logger.info_logger.info(msg, *args, stacklevel=2, **kwargs)

方法2：兼容旧版本Python（手动获取调用者信息） #

如果项目运行在Python 3.8以下版本，可通过inspect模块手动提取调用者的栈帧信息，再通过extra参数传递给日志记录器：

import logging
from logging.handlers import RotatingFileHandler
import inspect  # 新增导入


class Logger:
    log_format = "%(asctime)s.%(msecs)d %(levelname)-8s [%(processName)s] [%(threadName)s] %(filename)s:%(lineno)d --- %(message)s"

    @staticmethod
    def setup_single_logger(name, logfile, level):
        handler = RotatingFileHandler(logfile, mode='a', maxBytes=1024 * 1024, backupCount=10)
        handler.setFormatter(logging.Formatter(Logger.log_format))
        logger = logging.getLogger(name)
        logger.setLevel(level)
        logger.addHandler(handler)
        return logger

    @staticmethod
    def setup_logging():
        Logger.info_logger = Logger.setup_single_logger('INFO', '/path/to/your/logfile.log', logging.INFO)

    @staticmethod
    def info(msg, *args, **kwargs):
        # 获取调用者的栈帧
        frame = inspect.currentframe().f_back
        try:
            # 提取文件名（仅保留最后部分）和行号
            filename = frame.f_code.co_filename.split('/')[-1]
            lineno = frame.f_lineno
            # 传递自定义的文件名和行号
            extra = {'filename': filename, 'lineno': lineno}
            Logger.info_logger.info(msg, *args, extra=extra, **kwargs)
        finally:
            # 手动删除帧引用，避免循环引用导致内存泄漏
            del frame


Logger.setup_logging()

修改后，日志输出将正确显示实际调用日志的文件和行号。

内容的提问来源于stack exchange，提问作者waykiki