python logging模块的使用总结

 import logging logging.debug('debug message') logging.info('info message') logging.warning('warning message')

 import os logging.basicConfig( filename=os.path.join(os.getcwd(),'all.log'), level=logging.DEBUG, format='%(asctime)s %(filename)s : %(levelname)s %(message)s', # 定义输出log的格式 filemode='a', datefmt='%Y-%m-%d %A %H:%M:%S', ) logging.debug('this is a message')

 import logging from logging import handlers class Logger(object): level_relations = { 'debug': logging.DEBUG, 'info': logging.INFO, 'warning': logging.WARNING, 'error': logging.ERROR, 'crit': logging.CRITICAL } def __init__(self, filename, level='info', when='D', backCount=3, fmt='%(asctime)s - %(pathname)s[line:%(lineno)d] - %(levelname)s: %(message)s'): s<em style="color:transparent">来源gao.dai.ma.com搞@代*码网</em>elf.logger = logging.getLogger(filename) format_str = logging.Formatter(fmt) # 设置日志格式 self.logger.setLevel(self.level_relations.get(level)) # 设置日志级别 # 向控制台输出日志 stream_handler = logging.StreamHandler() stream_handler.setFormatter(format_str) self.logger.addHandler(stream_handler) # 日志按文件大小写入文件 # 1MB = 1024 * 1024 bytes # 这里设置文件的大小为500MB rotating_file_handler = handlers.RotatingFileHandler( filename=filename, mode='a', maxBytes=1024 * 1024 * 500, backupCount=5, encoding='utf-8') rotating_file_handler.setFormatter(format_str) self.logger.addHandler(rotating_file_handler) log = Logger('all.log', level='info') log.logger.info('[测试log] hello, world')

 import logging from logging import handlers class Logger(object): level_relations = { 'debug': logging.DEBUG, 'info': logging.INFO, 'warning': logging.WARNING, 'error': logging.ERROR, 'crit': logging.CRITICAL } def __init__(self, filename, level='info', when='D', backCount=3, fmt='%(asctime)s - %(pathname)s[line:%(lineno)d] - %(levelname)s: %(message)s'): self.logger = logging.getLogger(filename) format_str = logging.Formatter(fmt) # 设置日志格式 self.logger.setLevel(self.level_relations.get(level)) # 设置日志级别 # 往文件里写入 # 指定间隔时间自动生成文件的处理器 timed_rotating_file_handler = handlers.TimedRotatingFileHandler( filename=filename, when=when, backupCount=backCount, encoding='utf-8') # 实例化TimedRotatingFileHandler # interval是时间间隔，backupCount是备份文件的个数，如果超过这个个数，就会自动删除，when是间隔的时间单位，单位有以下几种： # S 秒 # M 分 # H 小时、 # D 天、 # W 每星期（interval==0时代表星期一） # midnight 每天凌晨 timed_rotating_file_handler.setFormatter(format_str) # 设置文件里写入的格式 self.logger.addHandler(timed_rotating_file_handler) # 往屏幕上输出 stream_handler = logging.StreamHandler() stream_handler.setFormatter(format_str) self.logger.addHandler(stream_handler) log = Logger('all.log', level='info') log.logger.info('[测试log] hello, world')

 . ├── apps_api │  ├── common │  ├── models │  └── resources ├── logs ├── migrations │  └── versions ├── static ├── templates ├── test └── utils └── app.py └── config.py └── exts.py └── log.py └── manage.py └── run.py └── README.md └── requirements.txt

 # -*- coding: utf-8 -*- import logging from flask.logging import default_handler import os from logging.handlers import RotatingFileHandler from logging import StreamHandler BASE_DIR = os.path.dirname(os.path.abspath(__file__)) LOG_PATH = os.path.join(BASE_DIR, 'logs') LOG_PATH_ERROR = os.path.join(LOG_PATH, 'error.log') LOG_PATH_INFO = os.path.join(LOG_PATH, 'info.log') LOG_PATH_ALL = os.path.join(LOG_PATH, 'all.log') # 日志文件最大 100MB LOG_FILE_MAX_BYTES = 100 * 1024 * 1024 # 轮转数量是 10 个 LOG_FILE_BACKUP_COUNT = 10 class Logger(object): def init_app(self, app): # 移除默认的handler app.logger.removeHandler(default_handler) formatter = logging.Formatter( '%(asctime)s [%(thread)d:%(threadName)s] [%(filename)s:%(module)s:%(funcName)s] ' '[%(levelname)s]: %(message)s' ) # 将日志输出到文件 # 1 MB = 1024 * 1024 bytes # 此处设置日志文件大小为500MB，超过500MB自动开始写入新的日志文件，历史文件归档 file_handler = RotatingFileHandler( filename=LOG_PATH_ALL, mode='a', maxBytes=LOG_FILE_MAX_BYTES, backupCount=LOG_FILE_BACKUP_COUNT, encoding='utf-8' ) file_handler.setFormatter(formatter) file_handler.setLevel(logging.INFO) stream_handler = StreamHandler() stream_handler.setFormatter(formatter) stream_handler.setLevel(logging.INFO) for logger in ( # 这里自己还可以添加更多的日志模块，具体请参阅Flask官方文档 app.logger, logging.getLogger('sqlalchemy'), logging.getLogger('werkzeug') ): logger.addHandler(file_handler) logger.addHandler(stream_handler)

 # encoding: utf-8 from log import Logger logger = Logger()

 # encoding: utf-8 from flask import Flask from config import CONFIG from exts import logger def create_app(): app = Flask(__name__) # 加载配置 app.config.from_object(CONFIG) # 初始化logger logger.init_app(app) return app

 # -*- coding: utf-8 -*- from app import create_app app = create_app() if __name__ == '__main__': app.run()

 $ python run.py * Serving Flask app "app" (lazy loading) * Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Debug mode: on 2019-07-08 08:15:50,396 [140735687508864:MainThread] [_internal.py:_internal:_log] [INFO]: * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit) 2019-07-08 08:15:50,397 [140735687508864:MainThread] [_internal.py:_internal:_log] [INFO]: * Restarting with stat 2019-07-08 08:15:50,748 [140735687508864:MainThread] [_internal.py:_internal:_log] [WARNING]: * Debugger is active! 2019-07-08 08:15:50,755 [140735687508864:MainThread] [_internal.py:_internal:_log] [INFO]: * Debugger PIN: 234-828-739