Hmm, I see ints, floats and decimal.Decimal all produce the same hashes
for integer values, so they also suffer the same fate in sets and
dicts.
On Mon, 2020-12-21 at 03:09 -0500, David Mertz wrote:
> I sure hope this never happens! It would break millions of working
> lines and kill a common useful pattern.
>
> ntrue = sum(this == that for this, that in items)
>
> -100.
>
> On Mon, Dec 21, 2020, 3:00 AM Paul Bryan <pbr...@anode.ca> wrote:
> > I know this has come up in the past.
> >
> > Could the consensus have changed regarding bool's inheritance from
> > int?
> >
> > This is not intuitive (to me), and recently bit me as a bug:
> >
> > Python 3.9.1 (default, Dec 13 2020, 11:55:53)
> > [GCC 10.2.0] on linux
> > Type "help", "copyright", "credits" or "license" for more
> > information.
> > >>> {1,True}
> > {1}
> >
> >
> > I've worked around it by storing tuple(type, value) in the set,
> > which is fugly. Yes, I need mixed types in the set, and I'm using
> > the set for efficient lookup.
> >
> > A contrived example I dreamed-up, which I also find non-intuitive:
> >
> > >>> x = {}
> > >>> x[True] = 1
> > >>> x
> > {True: 1}
> > >>> x[1] = 1
> > >>> x
> > {True: 1}
> >
> >
> > Maybe a wish list item for Python 4.0?
> >
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