On Sun, 3 May 2015 02:51 pm, Ian Kelly wrote: > On Sat, May 2, 2015 at 5:51 PM, Terry Reedy <tjre...@udel.edu> wrote: >> On 5/2/2015 5:31 PM, Ian Kelly wrote: >> >>> Would it have been better if range() had been implemented as xrange() >>> from the beginning? Sure, that would have been great. Except for one >>> small detail: the iterator protocol didn't exist back then. >> >> >> For loops originally used the getitem iterator protocol. xrange objects >> have >> a __getitem__ method, but not __iter__ or __next__. As Mark pointed out, >> they were introduced in 1993. > > I'm aware of getitem iterators; just didn't realize that xrange used > it or was that old.
Yep, xrange objects are *not* iterators: py> r = xrange(100) py> iter(r) is r False py> next(r) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: xrange object is not an iterator -- Steven -- https://mail.python.org/mailman/listinfo/python-list
