Python中日志打印输出不完整是什么原因

import logging
logging.basicConfig(level=logging.INFO)
logging.debug('Debugging information')
logging.info('Informational message')
logging.warning('Warning:config file %s not found', 'server.conf')
logging.error('Error occurred')
logging.critical('Critical error -- shutting down')

运行报错: 日志为什么没有输出DEBUG级别的日志

INFO:root:Informational message
WARNING:root:Warning:config file server.conf not found
ERROR:root:Error occurred
CRITICAL:root:Critical error -- shutting down