On Mon, Aug 24, 2009 at 12:41 AM, Simon King <simon.k...@nuigalway.ie>wrote:
>
> Hi Minh,
>
> On 24 Aug., 02:10, Minh Nguyen <nguyenmi...@gmail.com> wrote:
> [...]
> > > Since I am not an experienced programmer: Are there reasons to not use
> > > a dictionary for those kind of things?
> >
> > A good point: searching through a dictionary is essentially constant
> time.
> >
> > A bad point: can't assume that each key/value pair in a dictionary
> > would always be ordered in exactly the same way. This assumption was
> > uncovered during the development of Sage 4.1.1 when a doctest failed.
> > The cause of the failure: the doctest assumed that printing the
> > key/value pairs of a dictionary would always result in exactly the
> > same arrangement of key/value pairs. Bad assumption there.
>
> But you couldn't use the attribute "._properties" in doc tests anyway,
> because AFAIK rings are cdef classes, so, you can't access the
> attributes on a python level.
Yes you can, if you declare them "cdef public _properties". But the
dictionaries-in-doctests issue is something we have contended with for years
and their a standard solution. When you write a doctest that involves
printing out d, instead print out say:
list(sorted(list(d)))
or something like that.
-- William
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