[Python-Dev] Type annotations and metaclasses

[Ivan Levkivskyi]

Hi Thomas,

I think this question is more appropriate for mypy or typing trackers:
https://github.com/python/mypy/issues
https://github.com/python/typing/issues

--
Ivan



On 3 March 2017 at 22:56, Thomas Hauk <THauk at copperleaf.com> wrote:

> I’ve read through PEPs 483, 484, and 526, but I don’t see any discussion
> of how type hints should work when the type of a class member differs from
> the type of an instance member, like when metaclasses are used to create
> instances.
>
>
>
> e.g.:
>
>
>
> >>> from django.db import models
>
> >>> class MyModel(models.Model):
>
> ...     name = models.CharField()
>
> ...     class Meta:
>
> ...         app_label = "myapp"
>
> ...
>
> >>> type(MyModel.name)
>
> <class 'django.db.models.query_utils.DeferredAttribute'>
>
> >>> m = MyModel()
>
> >>> type(m.name)
>
> <class 'str'>
>
>
>
> In this case, I would like to be able to specify an instance type of str
> for MyModel.name.
>
>
>
> Can someone point me to any existing relevant discussion? Or if not, where
> should a new discussion start?
>
>
>
> T
>
>
>
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