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

Vinay Sajip vinay_sajip at
Wed Oct 29 14:17:52 CET 2008

On Oct 29, 11:24 am, Steve Holden <st... at> wrote:

> One deficiency of this approach, however, is that the string formatting
> is performed even when nologgingis required, thereby wasting a certain
> amount of effort on unnecessary formatting.

Though you can mitigate this using the pattern:

if logger.isEnabledFor(logging.DEBUG):
    logger.debug("Message with variable data which may be expensive:
%s", expensive_call())

Which will only make the expensive_call() and formatting when the
logging call will actually do something.


Vinay Sajip

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