Please consider adding partialclass to functools

[Neil Girdhar]

Essentially, functools.partial is almost good enough for specifying some of the parameters of an object's initializer, but the partial object doesn't respond properly to issubclass.  Please consider adding something like partialclass described here:

https://stackoverflow.com/questions/38911146/python-equivalent-of-functools-partial-for-a-class-constructor

I ended up doing the same thing here:

https://stackoverflow.com/questions/50143864/is-there-a-nice-way-to-partially-bind-class-parameters-in-python/50143893#50143893

Adding functools.partialclass would be similar to the addition of partialmethod in 3.4.

Best,

Neil

[Guido van Rossum]

I think this would be appropriate to file a feature request issue on bugs.python.org, and then submit a PR. (If you don't want to submit the PR, I'm afraid it's better if you don't bother with the issue -- we have enough minor feature requests already, we need to filter by what people are actually willing to put an effort into.)

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--Guido van Rossum (python.org/~guido)

[Neil Girdhar]

Yes, I'm happy to put a PR together.

Thanks,

Neil

[Steven D'Aprano]

On Wed, May 02, 2018 at 02:46:09PM -0700, Neil Girdhar wrote:
> Essentially, functools.partial is almost good enough for specifying some of
> the parameters of an object's initializer, but the partial object doesn't
> respond properly to issubclass.

[...]

I think that ought to be an uncontroversial enough change that it can be
taken to the bug tracker. I think you should just raise a feature
enhancement request for 3.8 on the tracker, and link to this thread on
the mailing list archives in case some discussion follows.


--
Steve

[Neil Girdhar]

Done: https://bugs.python.org/issue33419

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[Terry Reedy]

On 5/3/2018 2:34 PM, Neil Girdhar wrote:
> Done: https://bugs.python.org/issue33419

I agree with Steven.
Add the functools 'experts' as nosy. And add links to the SO items.

> On Wed, May 2, 2018 at 10:42 PM Steven D'Aprano
> <st...@pearwood.info

> <mailto:st...@pearwood.info>> wrote:
>
> On Wed, May 02, 2018 at 02:46:09PM -0700, Neil Girdhar wrote:
> > Essentially, functools.partial is almost good enough for
> specifying some of
> > the parameters of an object's initializer, but the partial object
> doesn't
> > respond properly to issubclass.
> [...]
>
> I think that ought to be an uncontroversial enough change that it
> can be
> taken to the bug tracker. I think you should just raise a feature
> enhancement request for 3.8 on the tracker, and link to this thread on
> the mailing list archives in case some discussion follows.

--

Terry Jan Reedy

[Neil Girdhar]

Thank you.  Done.