- Original Message -
Within __init__ I setup a log with self.log =
logging.getLogger('foo') then add a
console and filehandler which requires the formatting to be
specified. There a few
methods I setup a local log object by calling getChild against the
global log object.
This works fine until I need to adjust the formatter for a few. With
this style, I need
to redefine the handlers, so basically setup logging again.
I tried to get around this by using basicConfig and simply
re-specifying format inside
the few methods, but it didn't work.
How does one accomplish this most elegantly so I can define one log
instance with
the appropriate general console and file handlers in my class, then
simply override
the formatter for both handlers they use in a couple methods?
Thanks!
jlc
Hi,
Depend on what type of customization you need, if you need additional fields,
that's pretty easy :
http://docs.python.org/2/howto/logging-cookbook.html#context-info
If you need to completely change the format pattern, I'm not sure there an easy
way, thread safe to do such thing. The closest thing that comes to my mind
would be to write your own Formatter than can handle multiple formats,
depending on the record attributes:
Class MultiFormatter(logging.Formatter):
def format(record):
if record.funcName == 'bar':
# substitute self._fmt with something else
# then call super(format)
logging.Formatter(self, record) # not sure this one would be thread safe
Records have a funcName and module attribute, but I'm not sure collision could
be handled properly with those.
Maybe the safest thing to do would be to add a contextual info to your log
holding a specific format.
class Foo():
def bar(self):
self.logger.info(hello, extra = {'format' : %(message)s}) # would be
handled in MultiFormatter
cheers,
JM
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