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将日志级别设置为logging.debug或logging.info无效

python-3.6 logging python

DragonBobZ · 技术社区 · 5 年前

我正在尝试进行一个非常简单的日志记录设置。我只希望所有日志输出都转到终端和日志文件。我在上找到了下面的示例 Real Python 它演示流和文件日志处理程序的设置:

# logging_example.py

import logging

# Create a custom logger
logger = logging.getLogger(__name__)

# Create handlers
c_handler = logging.StreamHandler()
f_handler = logging.FileHandler('file.log')
c_handler.setLevel(logging.WARNING)
f_handler.setLevel(logging.ERROR)

# Create formatters and add it to handlers
c_format = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
f_format = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
c_handler.setFormatter(c_format)
f_handler.setFormatter(f_format)

# Add handlers to the logger
logger.addHandler(c_handler)
logger.addHandler(f_handler)

logger.warning('This is a warning')
logger.error('This is an error')

## Log Output
# 2019-08-31 22:16:02,478 - __main__ - WARNING - This is a warning
# 2019-08-31 22:16:02,478 - __main__ - ERROR - This is an error

这会像您所期望的那样记录到控制台和文件中。但是,当我修改程序时,它也会记录信息,比如:

import logging

# Create a custom logger
logger = logging.getLogger(__name__)

# Create handlers
c_handler = logging.StreamHandler()
f_handler = logging.FileHandler('file.log')
c_handler.setLevel(logging.DEBUG)
f_handler.setLevel(logging.DEBUG)

# Create formatters and add it to handlers
c_format = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
f_format = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
c_handler.setFormatter(c_format)
f_handler.setFormatter(f_format)

# Add handlers to the logger
logger.addHandler(c_handler)
logger.addHandler(f_handler)


logger.warning('logs')
logger.error('logs')
logger.info('should log but doesn\'t')
logger.debug('should log but doesn\'t')

## Log Output
# __main__ - WARNING - logs
# __main__ - ERROR - logs

我做错什么了?任何帮助都将不胜感激!

2 回复 | 直到 5 年前

Marius Mucenicu 5 年前

您还需要调用 setLevel(level) 上 logger 对象本身,因为默认情况下,它将使用 ROOT 的日志级别(如果它没有任何其他祖先),即 WARNING :

logger.setLevel(logging.DEBUG)

带输出的完整代码:

import logging

logger = logging.getLogger(__name__)

# Create handlers
c_handler = logging.StreamHandler()
f_handler = logging.FileHandler('file.log')
logger.setLevel(logging.DEBUG) # <<< Added Line
c_handler.setLevel(logging.DEBUG)
f_handler.setLevel(logging.INFO)

# Create formatters and add it to handlers
c_format = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
f_format = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
c_handler.setFormatter(c_format)
f_handler.setFormatter(f_format)

# Add handlers to the logger
logger.addHandler(c_handler)
logger.addHandler(f_handler)


logger.warning('logs')
logger.error('logs')
logger.info('should log but doesn\'t')
logger.debug('should log but doesn\'t')

输出:

__main__ - WARNING - logs
__main__ - ERROR - logs
__main__ - INFO - should log but doesn't
__main__ - DEBUG - should log but doesn't

logan 5 年前

有两个地方可以设置级别: Logger , Handler . 这两者都将影响日志记录设置的输出——在日志记录流的不同节点中。你也可以添加 Fliter 对这两个实例以使用更复杂的规则筛选日志记录。

流动的炭 office docment 明确日志记录时发生的情况。