[Tutor] single key ordered sequence

[Jervis Whitley]

On Fri, Jan 16, 2009 at 9:15 AM, Kent Johnson <kent37 at tds.net> wrote:

> On Thu, Jan 15, 2009 at 3:44 PM, Jervis Whitley <jervisau at gmail.com>
> wrote:
> > how about this:
> > items = [(1,'a'),(1,'b'),(2,'a'),(3,'a'),
> >             (3,'b'),(4,'a'),(5,'a'),(5,'b'),(5,'c')]
> > mydict = dict(items)
> > items = [item for item in mydict.iteritems()]
>
> That only coincidentally preserves order; the order of items in a
> dictionary is, for practical purposes, unpredictable.
>
> BTW [item for item in mydict.iteritems()] can be written as just
> mydict.items().
>
> Kent

I realise that what you have said is true, however
can you show me a case where
> items = dict(items).items()

will not preserve order? Thanks.
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