[Python-Dev] Change to logging Formatters: support for alternative format styles

Olemis Lang olemis at gmail.com
Fri Oct 29 17:44:03 CEST 2010

On Fri, Oct 29, 2010 at 10:07 AM, Barry Warsaw <barry at python.org> wrote:
> On Oct 25, 2010, at 02:28 PM, Vinay Sajip wrote:
>>I've just checked in a change to logging into the py3k branch (r85835),
>>including doc changes and tests, for providing slightly more flexibility in
>>alternative format styles for logging.
>>Basically, Formatter.__init__ gets an extra optional keyword arg style=<one of
>>'%' (default), '{' or '$'>. This is then used to merge the format string with
>>the LogRecord: either fmt % record.__dict__, or fmt.format(**record.dict), or
>>string.Template(fmt).substitute(**record.dict). Backward compatibility is
>>maintained (unless I've missed something).
> This sounds like a reasonable solution that provides the flexibility we want,
> while maintaining backward compatibility.  Thanks!
> I haven't played with it yet, but do you think it makes sense to add a 'style'
> keyword argument to basicConfig()?  That would make it pretty easy to get the
> formatting style you want without having to explicitly instantiate a
> Formatter, at least for simple logging clients.

Since this may be considered as a little sophisticated, I'd rather
prefer these new classes to be added to configuration sections using
fileConfig (and default behavior if missing), and still leave
`basicConfig` unchanged (i.e. *basic*) .

PS: Good work !



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