Python:使用自定义*kwargs记录异常

Question

您可能知道python日志记录模块支持*kwargs的定义来自定义日志条目.记录异常似乎不支持此操作.

我的问题:使用logging.exception有一种简单的方法来使用自定义kwargs吗？

最小的例子如下:

import logging
import logging.handlers

def create_logger(): 
    """ initialize logging using sys log

    """
    logger = logging.getLogger()

    form = '%(asctime)s [%(levelname)-8s] %(xyz)s %(message)s'
    local_log_handler = logging.handlers.SysLogHandler(address='/dev/log')
    formatter = logging.Formatter(form)
    local_log_handler.setFormatter(formatter)

    logger.addHandler(local_log_handler)
    return logger

log = create_logger()
try:
    raise AttributeError("whatever")
except:
    log.warn('Alarm! Fire!', extra={'xyz':'POLICE'})
    log.exception('')

输出:

Traceback (most recent call last):
  File "logexample.py", line 27, in <module>
    log.exception('')
  File "/usr/lib/python2.7/logging/__init__.py", line 1172, in exception
    self.error(msg, exc_info=1, *args)
  File "/usr/lib/python2.7/logging/__init__.py", line 1166, in error
    self._log(ERROR, msg, args, **kwargs)
  File "/usr/lib/python2.7/logging/__init__.py", line 1258, in _log
    self.handle(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 1268, in handle
    self.callHandlers(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 1308, in callHandlers
    hdlr.handle(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 748, in handle
    self.emit(record)
  File "/usr/lib/python2.7/logging/handlers.py", line 791, in emit
    msg = self.format(record) + '\000'
  File "/usr/lib/python2.7/logging/__init__.py", line 723, in format
    return fmt.format(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 467, in format
    s = self._fmt % record.__dict__
KeyError: 'xyz'

系统日志:

Jul 30 14:56:27 localhost 2012-07-30 14:56:27,131 [WARNING ] POLICE Alarm! Fire!

PS:一点背景,我正在编写一个带有线程的进程,我想以下列方式记录信息:

[app-thread1] [app-thread2] ...

Answer 1

你可以使用eg

logger.error('Message with %s', 'args', exc_info=1, extra={...})