Roy Smith wrote:
> In http://docs.python.org/release/2.6.7/library/logging.html, it says:
>
> logging.debug(msg[, *args[, **kwargs]])
> [...]
> There are two keyword arguments in kwargs which are inspected: exc_info
> which, if it does not evaluate as false, causes exception information to
> be added to the logging message. If an exception tuple (in the format
> returned by sys.exc_info()) is provided, it is used; otherwise,
> sys.exc_info() is called to get the exception information.
>
> I don't get what this is trying to do. I have this code:
>
> try:
> f = urllib2.urlopen(url)
> except urllib2.HTTPError as ex:
> logger.error("Unable to retrieve profile from facebook
> (access_token='%r')" % access_token,
> exc_info=ex)
>
> which ends up logging:
>
> [...] ERROR _get_profile Unable to retrieve profile from facebook
> (access_token='u'[token elided]'')
>
> so what is the exc_info doing? What "exception information" is being
> added to the message? Am I just calling this wrong?
I think whatever the formatter's formatException() makes out of the
(exception_type, exception_value, traceback) tuple lands in the logfile:
>> import logging
>>> logging.basicConfig()
>>> try: 1/0
... except: logging.error("yadda")
...
ERROR:root:yadda
>>> try: 1/0
... except: logging.error("yadda", exc_info=True)
...
ERROR:root:yadda
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ZeroDivisionError: integer division or modulo by zero
>>> class Formatter(logging.Formatter):
... def formatException(self, *args): return "OOPS"
...
>>> logging._handlers.keys()[0].setFormatter(Formatter()) # ;)
>>> try: 1/0
... except: logging.error("yadda", exc_info=True)
...
yadda
OOPS
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