[Python-ideas] Allow Profile() to be used as a context manager (original) (raw)

David Townshend aquavitae69 at gmail.com
Wed Jan 25 11:28:46 CET 2012

Would that stop the profiler between calles though? In Yuval's example, wouldn't do_a_hard_but_i_dont_care_now_task be included in the profile then?

On Wed, Jan 25, 2012 at 12:16 PM, Robert Kern <robert.kern at gmail.com> wrote:

On 1/25/12 6:36 AM, David Townshend wrote:

I often find it useful to profile small sections to code in a running application to pinpoint a known bottleneck. The cProfile and profile modules don't make this easy as they stand, requiring the section of code to be wrapped into a single statement with can be called as a string using exec(). This always feels a bit clumsy to me, so my idea is simply to provide enter and exit methods to cProfile.Profile() and profile.Profile(). From a quick look at the code it seems that this should be very easy for cProfile, and slightly less easy for profile (I can't quite figure out how to deal with the setcmd() line, or how important it is - maybe someone can help?).

Any major objections to this? I've done this in my kernprof.py script, which I use as a convenient generic profiling script. I subclass cProfile.Profile to add enablebycount()/disableby**count() methods that allow nesting. enablebycount() increments a counter and only calls the enable() method the first time. disablebycount() decrements the counter and only calls disable() when it hits 0 again. enter() and exit() just call these methods. I also add a call() method that lets a Profile instance act as a decorator, which I actually find somewhat more useful than the context manager. https://bitbucket.org/robertkern/lineprofiler/src/ tip/kernprof.py#cl-57<https://bitbucket.org/robertkern/lineprofiler/src/tip/kernprof.py#cl-57> -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco _______** Python-ideas mailing list Python-ideas at python.org http://mail.python.org/**mailman/listinfo/python-ideas<http://mail.python.org/mailman/listinfo/python-ideas> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-ideas/attachments/20120125/cac58fac/attachment.html>

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