On 01Mar2021 00:06, MRAB <pyt...@mrabarnett.plus.com> wrote: >I'm not seeing a huge problem here: > >Python 3.9.2 (tags/v3.9.2:1a79785, Feb 19 2021, 13:44:55) [MSC v.1928 >64 bit (AMD64)] on win32 >Type "help", "copyright", "credits" or "license" for more information. >>>> import time >>>> class A: >... def __len__(self): >... return 1024**3 >... def __iter__(self): >... yield from () >... >>>> a = A() >>>> len(a) >1073741824 >>>> s = time.time() >>>> list(a) >[] >>>> print(time.time() - s) >0.16294455528259277
3.9.1 on MacOS: 14.529589891433716 3.9.2 on MacOS: instant again Interesting. - Cameron Simpson <c...@cskk.id.au> -- https://mail.python.org/mailman/listinfo/python-list
