'%(asctime)s - %(name)s - %(levelname)s - %(message)s'

import logging
logger = logging.getLogger(__name__)  # 推薦使用模塊名作為Logger名稱
logger.setLevel(logging.DEBUG)        # 設置記錄的最低級別

# 創(chuàng)建控制臺 Handler
console_handler = logging.StreamHandler()
console_handler.setLevel(logging.WARNING)  # 控制臺只輸出 WARNING 及以上級別
# 創(chuàng)建文件 Handler
file_handler = logging.FileHandler('app.log')
file_handler.setLevel(logging.DEBUG)      # 文件記錄所有 DEBUG 及以上級別
# 定義 Formatter
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
console_handler.setFormatter(formatter)
file_handler.setFormatter(formatter)
# 將 Handler 添加到 Logger
logger.addHandler(console_handler)
logger.addHandler(file_handler)

logger.debug('Debug 信息')
logger.info('程序啟動')
logger.warning('磁盤空間不足')
logger.error('請求超時')

import logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler('app.log'),
        logging.StreamHandler()
    ]
)
logging.warning('警告信息')

import logging.config
config = {
    'version': 1,
    'formatters': {
        'default': {'format': '%(asctime)s - %(levelname)s - %(message)s'}
    },
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
            'formatter': 'default',
            'level': 'DEBUG'
        }
    },
    'root': {
        'handlers': ['console'],
        'level': 'INFO'
    }
}
logging.config.dictConfig(config)

try:
    1 / 0
except Exception:
    logger.exception('發(fā)生異常:')

if logger.isEnabledFor(logging.DEBUG):
    logger.debug(f'耗時操作: {time_consuming()}')