Python中的Logging模块在项目应用小结

python
import logging  
# 配置日志记录器  
logging.basicConfig(level=logging.DEBUG,  
                    format='%(asctime)s - %(levelname)s - %(message)s',  
                    filename='example.log',  
                    filemode='w')  
# 在代码中使用日志记录器  
logging.debug('This is a debug message.')  
logging.info('This is an info message.')  
logging.warning('This is a warning message.')  
logging.error('This is an error message.')  
logging.critical('This is a critical message.')

python
import logging  
# 创建一个日志记录器  
logger = logging.getLogger('my_logger')  
logger.setLevel(logging.DEBUG)  
# 创建一个控制台处理器，将日志输出到控制台  
console_handler = logging.StreamHandler()  
console_handler.setLevel(logging.INFO)  
# 创建一个文件处理器，将日志输出到文件  
file_handler = logging.FileHandler('example.log')  
file_handler.setLevel(logging.DEBUG)  
# 创建一个格式化器，定义日志消息的格式  
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')  
# 将格式化器添加到处理器中  
console_handler.setFormatter(formatter)  
file_handler.setFormatter(formatter)  
# 将处理器添加到记录器中  
logger.addHandler(console_handler)  
logger.addHandler(file_handler)  
# 在代码中使用日志记录器  
logger.debug('This is a debug message.')  
logger.info('This is an info message.')  
logger.warning('This is a warning message.')  
logger.error('This is an error message.')  
logger.critical('This is a critical message.')

import os
import logging
import sys
from django.conf import settings
from datetime import datetime
os.makedirs(settings.LOGS, exist_ok=True)
class Logger:
    _instance = None
    def __init__(self):
        self.format = '%(asctime)s %(thread)d %(threadName)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s'
        # django中项目的名称
        self.logger = logging.getLogger(settings.PROJECTNAME)
        self.logger.setLevel(logging.DEBUG)
        self.add_stream_handle()
        self.file = os.path.join(settings.LOGS, f'{datetime.now().strftime("%Y%m%d_%H%M%S")}.log')
        self.add_file_handle(self.file)
    def add_stream_handle(self):
        handler = logging.StreamHandler(sys.stdout)
        handler.setLevel(level=logging.INFO)
        handler.setFormatter(logging.Formatter(self.format))
        self.logger.addHandler(handler)
    def add_file_handle(self, file):
        handler = logging.FileHandler(file, encoding="utf-8")
        handler.setLevel(level=logging.DEBUG)
        handler.setFormatter(logging.Formatter(self.format))
        self.logger.addHandler(handler)
    @classmethod
    def get_logger(cls):
    	# 初始化一次，通常__init__.py文件中调用
        if cls._instance is None:
            cls._instance = Logger().logger
        return cls._instance
Logger.get_logger()

# 其他模块中使用
import logging
from django.conf import settings
logger = logging.getLogger(settings.PROJECTNAME)
logger.info("INFO")
logger.warning("WARNING")
logger.error("ERROR")