On Jan 26, 12:08 pm, Terry Reedy <tjre...@udel.edu> wrote: > Fuzzyman wrote: > > On Jan 25, 2:28 pm, Alan G Isaac <alan.is...@gmail.com> wrote: > >> On 1/16/2009 3:13 PM Alan G Isaac apparently wrote: > >> > It is documented: > >> >http://docs.python.org/3.0/library/stdtypes.html#sequence-types-str-b... > > >> But then again, the opposite is also documented, > >> since `range` is a sequence type. Quoting: > > >> Sequences also support slicing ... > > >> Some sequences also support “extended slicing” > > >> Is this a documentation bug, or a bug in `range`? > >> (I'd think the latter.) > > No range slicing is intended. > > > Where does the documentation say that range objects are sequences? > > They're iterables. > > Range objects (2.x xrange objects) were more sequence-like in 2.x. 3.0 > doc still says "There are five sequence types: strings, byte sequences, > byte arrays, lists, tuples, and range objects" (the miscount has already > been reported.) > > I added a note to > http://bugs.python.org/issue4966 > suggesting that ranges be removed from the sequence section. > I made several other suggestions for improving this sections. > > Supportive comments might help get action.
I agree the docs need to be fixed; it's not very sequency at all. Other comments: * This error message should not use the s-word, but this may be unavoidable: >>> range(10)[1:3] Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: sequence index must be integer, not 'slice' * It would be good if the docs said more about what it is meant to be used for, apart from the obvious "for item in a_range". You can subscript a range, not that it's very useful: >>> range(10)[7] 7 It has neither next() nor __next__() method, and appears to be reusable (which is good, IMO): >>> x = range(10) >>> x.next() Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'range' object has no attribute 'next' >>> x.__next__() Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'range' object has no attribute '__next__' >>> list(x) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> list(x) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> It is immutable, and thus can be hashed ... use case? Cheers, John -- http://mail.python.org/mailman/listinfo/python-list
