python - 为什么我的日志记录在 Python 3 中不起作用？

Question

我正在尝试以这种方式在 Python 3 中添加日志记录处理程序:

$ python3
Python 3.5.2 (default, Sep 14 2017, 22:51:06) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import logging
>>> 
>>> logger = logging.getLogger()
>>> handler = logging.StreamHandler()
>>> handler.setLevel(logging.INFO)
>>> logger.addHandler(handler)
>>> 
>>> logging.info("my info")
>>> logging.warning("my warning")
my warning

我将日志级别指定为 INFO。为什么 logging.info("my info") 什么都不输出？

Answer 1

因为你need也可以设置 logger 控制杆。

import logging

logger = logging.getLogger()
# here
logger.setLevel(logging.INFO)
handler = logging.StreamHandler()
handler.setLevel(logging.INFO)
logger.addHandler(handler)

输出:

>>> logging.info("my info")
my info
>>> logging.warning("my warning")
my warning