Le Tue, 10 Sep 2013 15:09:56 +0200,
Hrvoje Niksic <hrvoje.niksic at avl.com> a écrit :
> On 09/10/2013 02:24 PM, Paul Moore wrote:
> >>>> td['FOO'] = 42
> >>>> td['foo'] = 32
> >>>> list(td.keys())
> >
> > ['FOO'] or ['foo']? Both answers are justifiable.
>
> Note that the same question can be reasonably asked for dict itself:
>
> >>> d = {}
> >>> d[1.0] = 'foo'
> >>> d[1] = 'bar'
> >>> d
> {1.0: 'bar'}
>
> So, dict.__setitem__ only replaces the value, leaving the original
> key in place. transformdict should probably do the same, returning
> 'FOO' in your example.
It's not that obvious. It's not common to rely on that aspect of dict
semantics, because you will usually lookup using the exact same type,
not a compatible one. I would expect very little code, if any, to rely
on this.
(also, I would intuitively expect the latest key to be held, not the
first one, since that's what happens for values.)
Regards
Antoine.
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