Python-requests中, 这一段logging的用法是什么作用 ?

Question

实际现象

• 一段不熟悉的logging用法( 猜测是给库打log 用的 )

预期现象

• 弄清楚该段 logging 代码的作用原理( 虽然有句注释 # Set default logging handler to avoid "No handler found" warnings. )

相关代码

• requests.__init__.py中的用法

# Set default logging handler to avoid "No handler found" warnings.
import logging
try:  # Python 2.7+
    from logging import NullHandler
except ImportError:
    class NullHandler(logging.Handler):
        def emit(self, record):
            pass

logging.getLogger(__name__).addHandler(NullHandler())

上下文环境

• 产品版本: requests最新

• 操作系统: Linux

• Python: 2.7.x

Answer 1

This means that if your current version of the logging module does not have a NullHandler, write one yourself. In short, ensure that the subsequent code has a NullHandler available