On Fri, Mar 16, 2018 at 4:48 AM, Antoine Pitrou <solip...@pitrou.net> wrote: > On Fri, 16 Mar 2018 04:15:11 +1100 > Chris Angelico <ros...@gmail.com> wrote: >> On Fri, Mar 16, 2018 at 12:38 AM, George Fischhof <geo...@fischhof.hu> wrote: >> > >> > >> > " if new file functions are added, they will go only in pathlib, >> > which makes pathlib effectively mandatory;" >> > Yes but I think this part of the evolution: slowly everyone will shift to >> > pathlib, >> > and being mandatory is true for the current status as well: if you need a >> > function, you need the module. >> > Right now if you wan to execute some file operations, you need os plus >> > shutil, because the half of the >> > functions are in one of them, the other half is in the other module >> >> The os module is cheap; pathlib has a definite cost. If every file >> operation goes through pathlib, that basically means pathlib becomes >> part of the startup cost: >> >> rosuav@sikorsky:~$ python3 -m timeit -s 'import subprocess, sys, >> pathlib' 'subprocess.check_call([sys.executable, "-c", "import os"])' >> 50 loops, best of 5: 8.82 msec per loop >> rosuav@sikorsky:~$ python3 -m timeit -s 'import subprocess, sys, >> pathlib' 'subprocess.check_call([sys.executable, "-c", "import >> pathlib"])' >> 20 loops, best of 5: 15.9 msec per loop > > Which version is this "python3"?
3.8, but I also tested with 3.7, 3.6, and 3.5. All of them showed the same kind of difference, but the numbers were a bit higher in the older versions. I fully expect that Python 3.4 (the first one where pathlib existed) would show the same too. ChrisA _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
