How to log in a specifc format in Python using logger?

Question

I am working with Python and I am using RotatingFileHandler to log to some file. I have a very simple question

I am logging like this -

zooklogger.info("steps:: Actual Steps :: Workflow Path :: Host Path %s %s %s" % (steps, wf_path, status_path))

And this is how it is getting logged -

steps:: Actual Steps :: Workflow Path :: Host Path [u'step3', u'step2', u'step1'] /re/wf/ius/v1 /re/colo/phx/h1/wf/ius/v1

Is there any way that it can be logged as -

steps:: Actual Steps :: [u'step3', u'step2', u'step1'], Workflow Path :: /re/wf/ius/v1, Host Path :: /re/colo/phx/h1/wf/ius/v1

I know its a pretty silly question to ask but not able to figure out.

Martijn Pieters · Accepted Answer · 2013-12-29 22:47:27Z

1

Sure, just move the %s placeholders:

zooklogger.info("steps:: Actual Steps :: %s, Workflow Path :: %s, Host Path :: %s" % (steps, wf_path, status_path))

The three strings are interpolated into the string at those locations.

Note that you can leave the interpolation step to the logging module; it'll postpone interpolating the values to the last moment; that way it doesn't do that work if the log entry never reaches a handler, for example:

zooklogger.info("steps:: Actual Steps :: %s, Workflow Path :: %s, Host Path :: %s",
                steps, wf_path, status_path)

Here the three arguments are passed in separately to the logger.info() call.

answered Dec 29, 2013 at 22:47

Martijn Pieters

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