当我没有定义控制台处理程序时，我不明白为什么日志事件会被打印到控制台。我通读的所有示例都明确定义了控制台处理程序（streamhandler），以便将消息打印到控制台。
我希望这些事件仅打印到一个文件中。
import logging
logger = logging.getLogger(__name__)
my_format = '%(asctime)-25s %(levelname)-8s LOGGER: %(name)-12s MODULE: %(module)-15s FUNCTION: %(funcName)-30s MSG: %(message)s'
my_datefmt ='%m/%d/%Y %I:%M:%S%p'
logging.basicConfig(format=my_format, datefmt=my_datefmt, level=logging.DEBUG)
formatter = logging.Formatter(my_format, datefmt=my_datefmt)
logger.setLevel(logging.DEBUG)
handler1 = logging.FileHandler('mylog.txt')
handler1.setLevel(logging.DEBUG)
handler1.setFormatter(formatter)
logger.addHandler(handler1)
logger.debug("Why is this printed to the console")
编辑：
有人指出，我没有考虑根记录器。在调用日志记录时。basicConfig，将默认streamhandler添加到根记录器（logger=getLogger（））
根记录器的处理程序可以修改，但是我发现我可以阻止我的记录器将日志传播到根记录器。
可以这样做：
import logging
logger = logging.getLogger(__name__)
my_format = '%(asctime)-25s %(levelname)-8s LOGGER: %(name)-12s MODULE: %(module)-15s FUNCTION: %(funcName)-30s MSG: %(message)s'
my_datefmt ='%m/%d/%Y %I:%M:%S%p'
logging.basicConfig(format=my_format, datefmt=my_datefmt, level=logging.DEBUG)
formatter = logging.Formatter(my_format, datefmt=my_datefmt)
logger.setLevel(logging.DEBUG)
handler1 = logging.FileHandler('mylog.txt')
handler1.setLevel(logging.DEBUG)
handler1.setFormatter(formatter)
logger.addHandler(handler1)
logger.propagate = False ####
logger.debug("Why is this printed to the console")
> ipython
import logging
logging.basicConfig?
*****************logging.basicConfig**************
Signature: logging.basicConfig(**kwargs)
Docstring:
Do basic configuration for the logging system.
This function does nothing if the root logger already has handlers
configured. It is a convenience method intended for use by simple scripts
to do one-shot configuration of the logging package.
The default behaviour is to create a StreamHandler which writes to
sys.stderr, set a formatter using the BASIC_FORMAT format string, and
add the handler to the root logger.
...
你有两个处理程序。
