python logging模塊簡單使用（包括控制檯輸出、文件寫入）

#簡單控制檯輸出
import logging
logging.basicConfig(level = logging.INFO,format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)
logger.info("Start print log")
logger.debug("Do something")
logger.warning("Something maybe fail.")
logger.info("Finish")
#簡單寫入文件(a是追加的方式)
import logging
logging.basicConfig(filename='log.txt',filemode='a',level = logging.INFO,format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)
logger.info("Start print log")
logger.debug("Do something")
logger.warning("Something maybe fail.")
logger.info("Finish")
#同時寫入文件和控制檯輸出
import logging
logger = logging.getLogger(__name__)
#定義級別
logger.setLevel(level = logging.INFO)
#設置文件寫入handler
file_handler = logging.FileHandler("log.txt")
file_handler.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
file_handler.setFormatter(formatter)
#設置控制檯輸出handler
console_handler = logging.StreamHandler()
console_handler.setLevel(logging.INFO)
#添加handler
logger.addHandler(console_handler)
logger.addHandler(console_handler)

logger.info("Start print log")
logger.debug("Do something")
logger.warning("Something maybe fail.")
logger.info("Finish")