On Mon, Jul 22, 2019 at 11:33 PM Nicholas Cole <nicholas.c...@gmail.com> wrote: > > I was profiling a slow function in an application last week, and came > across something that I still can’t explain. Inside a loop that was being > called 4 times, inside a for loop that ran for a few dozen times there was > a list compression of the form: > > [x.id for x in some_function()] > > According to the profiler, some_function was being called 52,000 times — > many, many times more than the few dozen it should have been. And sure > enough, removing the comprehension did indeed speed up the function. >
Was it actually being CALLED that many times, or was some part of it being RUN that many times? Try adding an actual counter to the top of some_function to see how many times it's being invoked. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
