how to use logging module to log an object like print()

[Steve Holden]

bieffe62 at gmail.com wrote:
> On 29 Ott, 12:24, Steve Holden <st... at holdenweb.com> wrote:
>> Diez B. Roggisch wrote:
>>> davy zhang schrieb:
>>>> mport logging
>>>> import pickle
>>>> # create logger
>>>> logger = logging.getLogger("simple_example")
>>>> logger.setLevel(logging.DEBUG)
>>>> # create console handler and set level to debug
>>>> ch = logging.StreamHandler()
>>>> ch.setLevel(logging.DEBUG)
>>>> # create formatter
>>>> formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s
>>>> - %(message)s ")
>>>> # add formatter to ch
>>>> ch.setFormatter(formatter)
>>>> # add ch to logger
>>>> logger.addHandler(ch)
>>>> d = {'key':'msg','key2':'msg2'}
>>>> # "application" code
>>>> logger.debug("debug message",d)#can not do this
>>> logger.debug("yes you can: %r", d)
>> One deficiency of this approach, however, is that the string formatting
>> is performed even when no logging is required, thereby wasting a certain
>> amount of effort on unnecessary formatting.
>>
>> regards
>>  Steve
>> --
>> Steve Holden        +1 571 484 6266   +1 800 494 3119
>> Holden Web LLC              http://www.holdenweb.com/- Nascondi testo citato
>>
> 
> Sure about that?
> 
> This is the implementation of Logger.debug in
> the file : ..Python25\lib\logging\__init__.py
> 
>    def debug(self, msg, *args, **kwargs):
>         """
>         Log 'msg % args' with severity 'DEBUG'.
> 
>         To pass exception information, use the keyword argument
> exc_info with
>         a true value, e.g.
> 
>         logger.debug("Houston, we have a %s", "thorny problem",
> exc_info=1)
>         """
>         if self.manager.disable >= DEBUG:
>             return
>         if DEBUG >= self.getEffectiveLevel():
>             apply(self._log, (DEBUG, msg, args), kwargs)
> 
> 
> The other methods (info, warning, ...) are similar. It looks like
> the formatting is only done if actually used.
> 
Pretty sure, and Vinay's reply convinced me I was correct. He should
know, after all ...

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC              http://www.holdenweb.com/