10 Tips for Mastering the Python Logging Module

import logging

# 创建自定义日志级别
CUSTOM_LEVEL = logging.INFO + 5
logging.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 Logger
logger = 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 Logger
logger = 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 Logger
logger = logging.getLogger("my_logger")
logger.addHandler(handler)

import logging
from contextlib import contextmanager

# 创建一个上下文处理器以添加请求 ID
@contextmanager
def request_id_context(request_id):
previous_request_id = logging.currentframe().f_locals.get("request_id")
try:
logging.currentframe().f_locals["request_id"] = request_id
yield
finally:
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 Logging
logging.config.dictConfig(logging_config)

import logging
import 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 logging
import threading

# 创建线程安全的 Logger
logger = 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 Logger
logger = 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 Logger
logger = logging.getLogger("my_logger")
logger.addHandler(logging.NullHandler())
logger.addFilter(logging.Filter())
logger.log = my_log_function