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. It is very strange and feels like a possible bug in python. Has anyone ever encountered anything similar? Best wishes, Nicholas -- https://mail.python.org/mailman/listinfo/python-list
