Le Mon, 2 Sep 2013 15:45:22 +0200, Antoine Pitrou <solip...@pitrou.net> a écrit : > Le Mon, 2 Sep 2013 06:18:31 -0700, > Eli Bendersky <eli...@gmail.com> a écrit : > > On Mon, Sep 2, 2013 at 1:24 AM, Antoine Pitrou <solip...@pitrou.net> > > wrote: > > > > > Le Sun, 1 Sep 2013 18:02:30 -0700, > > > Eli Bendersky <eli...@gmail.com> a écrit : > > > > Hello, > > > > > > > > I was looking at the possibility of replacing the SEEK_* > > > > constants by IntEnums, and the first thing that catches > > > > attention is that these constants are defined in both Lib/os.py > > > > and Lib/io.py; both places also recently started supporting > > > > SEEK_HOLE and SEEK_DATA (though here io refers to os.SEEK_HOLE > > > > and os.SEEK_DATA). > > > > > > What is the runtime cost of doing so? os is a fundamental module > > > that is imported by almost every Python program. > > > > > > > Theoretically, it should be very low given that we just need to add > > an import and define one class. os already does a number of things > > in its toplevel (mostly a few imports which transitively do other > > things). Compounded with import caching, since this is done just > > once per run, doesn't seem like a problem. > > > > Empirically, I tried measuring it but I can't discern a difference > > with/without translating SEEK_* to enums. There's a fluctuation of > > ~1usec which I can't distinguish from noise. Let me know if you have > > a good methodology of benchmarking these things > > How did you get that result? You have to remove to "os" from > sys.modules before importing it again, otherwise "import os" will > simply return the already imported module.
Oh and remove "enum" too... Regards Antoine. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
