掌握 Python Logging 模块的 10 个技巧

import logging# 创建自定义日志级别CUSTOM_LEVEL = logging.INFO + 5logging.addLevelName(CUSTOM_LEVEL, "CUSTOM")# 创建一个 Logger 并设置自定义日志级别logger = logging.getLogger("my_logger")logger.setLevel(CUSTOM_LEVEL)

import logging# 创建一个 FileHandler 并设置日志文件名file_handler = logging.FileHandler("my_log.txt")# 创建一个 StreamHandler 并输出到控制台stream_handler = logging.StreamHandler()# 将处理器添加到 Loggerlogger = logging.getLogger("my_logger")logger.addHandler(file_handler)logger.addHandler(stream_handler)

import logging# 创建一个过滤器以过滤 INFO 级别以上的事件info_filter = logging.Filter()info_filter.filter = lambda record: record.levelno >= logging.INFO# 将过滤器添加到 Loggerlogger = logging.getLogger("my_logger")logger.addFilter(info_filter)

import logging# 创建一个 FORMatter 并设置格式字符串formatter = logging.Formatter("%(asctime)s - %(levelname)s - %(message)s")# 将 Formatter 添加到处理器handler = logging.StreamHandler()handler.setFormatter(formatter)# 将处理器添加到 Loggerlogger = logging.getLogger("my_logger")logger.addHandler(handler)

import loggingfrom contextlib import contextmanager# 创建一个上下文处理器以添加请求 ID@contextmanagerdef request_id_context(request_id):previous_request_id = logging.currentframe().f_locals.get("request_id")try:logging.currentframe().f_locals["request_id"] = request_idyieldfinally:logging.currentframe().f_locals["request_id"] = previous_request_id# 使用上下文处理器logger = logging.getLogger("my_logger")with request_id_context("1234"):logger.info("Received request")

import logging# 配置字典logging_config = {"version": 1,"formatters": {"default": {"format": "%(asctime)s - %(levelname)s - %(message)s"}},"handlers": {"file": {"class": "logging.FileHandler","filename": "my_log.txt","formatter": "default",},"console": {"class": "logging.StreamHandler","formatter": "default",}},"loggers": {"my_logger": {"handlers": ["file", "console"],"level": "INFO",}}}# 从字典配置 Logginglogging.config.dictConfig(logging_config)

import loggingimport sentry_sdk# 初始化 Sentry 并与 Logging 集成sentry_sdk.init()logging.basicConfig(level=logging.INFO, handlers=[sentry_sdk.handler.SentryHandler()])

import loggingimport threading# 创建线程安全的 Loggerlogger = logging.getLogger("my_logger")# 创建一个线程并向 Logger 记录def thread_function():logger.info("Executing in a separate thread")# 启动线程thread = threading.Thread(target=thread_function)thread.start()

import logging# 创建一个 Loggerlogger = logging.getLogger("my_logger")# 记录一个异常try:raise Exception("An error occurred")except Exception as e:logger.exception(e)

import logging# 创建一个自定义日志记录函数def my_log_function(logger, level, msg, *args, **kwargs):# 您的自定义日志记录逻辑# 添加自定义日志记录函数到 Loggerlogger = logging.getLogger("my_logger")logger.addHandler(logging.NullHandler())logger.addFilter(logging.Filter())logger.log = my_log_function