Python，日志记录：将自定义处理程序与字典配置一起使用？答案

【问题标题】：Python, logging: use custom handler with dictionary configuration?Python，日志记录：将自定义处理程序与字典配置一起使用？
【发布时间】：2011-07-17 19:52:59
【问题描述】：

这是关于 Python 3.2 (GNU/Linux x86_64) 上的日志记录模块：是否可以使用字典配置设置自定义处理程序？这是我正在尝试的代码：

import logging
import logging.config

class CustomHandler(logging.StreamHandler):
    pass

logconfig = {
    'version': 1,
    'handlers': {
        'console': {
            'class': 'CustomHandler',
        }
    },
    'loggers': {
        'custom': {
            'handlers': ['console'],
        }
    }
}
logging.config.dictConfig(logconfig)
logger = logging.getLogger('custom')
logger.error('Error message')

这当然行不通。这是输出：

Traceback (most recent call last):
  File "/usr/lib/python3.2/logging/config.py", line 390, in resolve
    found = self.importer(used)
ImportError: No module named CustomHandler

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3.2/logging/config.py", line 569, in configure
    handler = self.configure_handler(handlers[name])
  File "/usr/lib/python3.2/logging/config.py", line 698, in configure_handler
    klass = self.resolve(config.pop('class'))
  File "/usr/lib/python3.2/logging/config.py", line 403, in resolve
    raise v
  File "/usr/lib/python3.2/logging/config.py", line 390, in resolve
    found = self.importer(used)
ValueError: Cannot resolve 'CustomHandler': No module named CustomHandler

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./prova.py", line 91, in <module>
    logging.config.dictConfig(logconfig)
  File "/usr/lib/python3.2/logging/config.py", line 777, in dictConfig
    dictConfigClass(config).configure()
  File "/usr/lib/python3.2/logging/config.py", line 574, in configure
    '%r: %s' % (name, e))
ValueError: Unable to configure handler 'console': Cannot resolve 'CustomHandler': No module named CustomHandler

源代码中有importer 方法，我真的不明白......有什么想法吗？

谢谢！

【问题讨论】：

标签： python logging configuration dictionary handler

【解决方案1】：

您需要告诉它在哪里可以找到CustomHandler 类。该字符串应包含可以找到它的模块（可能还有包）。如果你直接运行这个脚本，你可以使用__main__.CustomHandler。否则，使用your_module.CustomHandler，将your_module 替换为包含该类的模块的名称。

【讨论】：