Python，日志记录：使用带有字典配置的自定义处理程序？

Question

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')

这当然不起作用。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

源代码中有一个 importer 方法，我真的不明白......有什么想法吗？

谢谢你！

Answer 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）。如果直接运行此脚本，则可以使用__main__.CustomHandler。否则，请使用 your_module.CustomHandler，其中将 your_module 替换为包含该类的模块的名称。