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Groups > comp.lang.python > #197796
| From | Veek M <veekjunk@foobar.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: Python __hash__ return value - what use is it? |
| Date | 2026-05-31 10:13 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <10vh1kq$1f26j$1@dont-email.me> (permalink) |
| References | <10vgrfu$1dchl$1@dont-email.me> <10vguqb$1ecdn$1@dont-email.me> |
On Sun, 31 May 2026 09:25:32 -0000 (UTC), Lawrence D’Oliveiro wrote:
> On Sun, 31 May 2026 08:28:46 -0000 (UTC), Veek M wrote:
>
>> However when I print the set I see individual instances though I want
>> the instances to be the treated the same .ie there should be just one
>> instance in the set because the return value from __hash__
>> is always 1.
>>
>> In the dictionary when I print it I see the instances as individual
>> keys though I want to see a single key - what gives??
>
> Just tried your code in a Jupyter notebook under Python 3.13.12, and
> this was the output:
>
> in __bool__
> true -----
> in __hash__
> in __hash__
> in __eq__ <__main__.MyClass object at 0x7f68a86a4410>
> {<__main__.MyClass object at 0x7f68a8691400>}
> -----
> in __hash__
> in __hash__
> in __eq__ <__main__.MyClass object at 0x7f68a86a4410>
> {<__main__.MyClass object at 0x7f68a8691400>: '20'}
>
> As you expected, only a single element in the set, and only a single
> entry in the dict.
Oh. hmm - sorry - I guess I misread the output - I was under the
impression there were two instances. Should have used len to check though.
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Python __hash__ return value - what use is it? Veek M <veekjunk@foobar.com> - 2026-05-31 08:28 +0000
Re: Python __hash__ return value - what use is it? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-31 09:25 +0000
Re: Python __hash__ return value - what use is it? Veek M <veekjunk@foobar.com> - 2026-05-31 10:13 +0000
Re: Python __hash__ return value - what use is it? ram@zedat.fu-berlin.de (Stefan Ram) - 2026-05-31 09:40 +0000
Re: Python __hash__ return value - what use is it? Jon Ribbens <jon+usenet@unequivocal.eu> - 2026-05-31 13:06 +0000
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