#18538: xsrange is not an iterator when called with Python ints or longs
-------------------------------------+-------------------------------------
Reporter: tmonteil | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: misc | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/tmonteil/xsrange_is_not_an_iterator_when_called_with_python_ints_or_longs|
4a59f332523192b4fd236f3c3e0533049eff9f37
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Description changed by tmonteil:
Old description:
> As reported in [http://ask.sagemath.org/question/26950/range-xrange-and-
> ellipsis-iteration/ this ask question]: `xsrange` claims to return an
> iterator while it does not provide a `.next()` method when called with
> Python ints or longs:
>
> {{{
> sage: xsrange(int(42)).next()
> AttributeError: 'xrange' object has no attribute 'next'
> }}}
>
> This is because in those cases, it returns an `xrange` object (which is
> only an iterable).
New description:
As reported in [http://ask.sagemath.org/question/26950/range-xrange-and-
ellipsis-iteration/ this ask question], there is a problem with
`ellipsis_iter`:
{{{
sage: r = lambda n: (n-(n%2))//2
sage: for n in range(6):
....: print([r(n-k) + r(n+k) for k in (-n..n)])
AttributeError: 'xrange' object has no attribute 'next'
}}}
This is due to the fact that, while `xsrange` claims to return an
iterator, it does not provide a `.next()` method when called with Python
ints or longs:
{{{
sage: xsrange(int(42)).next()
AttributeError: 'xrange' object has no attribute 'next'
}}}
This is because in those cases, it returns an `xrange` object (which is
only an iterable).
--
--
Ticket URL: <http://trac.sagemath.org/ticket/18538#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
