Thank you
On Sat, Jun 26, 2021 at 8:10 PM Guido van Rossum <gu...@python.org> wrote:
> Okay, then Chris Barker’s explanation applies.
>
> On Sat, Jun 26, 2021 at 16:35 Daniel Walker <nickel...@gmail.com> wrote:
>
>> I wasn't looking at the type stub but cmd.py itself. It has
>>
>> PROMPT = '(Cmd) '
>> ...
>>
>> class Cmd:
>> prompt = PROMPT
>> ...
>>
>> On Sat, Jun 26, 2021 at 6:04 PM Guido van Rossum <gu...@python.org>
>> wrote:
>>
>>> On Sat, Jun 26, 2021 at 9:25 AM Daniel Walker <nickel...@gmail.com>
>>> wrote:
>>>
>>>> I was recently using the cmd module for a project where my CLI
>>>> could connect to and interact with another host. I implemented prompt in
>>>> such a way that it would show the IP address when connected. I.e.,
>>>>
>>>> class MyCmd(cmd.Cmd):
>>>> ...
>>>>
>>>> @property
>>>> def prompt(self) -> str:
>>>> if self.remote_host.connected():
>>>> return f'> ({self.remote_host.ip}) '
>>>> else:
>>>> return '> '
>>>>
>>>> This worked perfectly fine... until I ran mypy. mypy complained
>>>> because, in cmd.Cmd, prompt is a class attribute.
>>>>
>>>> Looking at cmd.py, this seems like an odd design choice as all of the
>>>> references to cmd are through the instance (i.e., self.prompt).
>>>>
>>>
>>> You misread the typeshed stub. Where you see these lines in cmd.pyi
>>>
>>> class Cmd:
>>> prompt: str
>>> identchars: str
>>> ruler: str
>>> ...
>>>
>>> those are all instance attribute declarations.
>>>
>>> I think that you're running into a different mypy bug, which is that you
>>> can't override a plain attribute with a property in a subclass.
>>>
>>> I think there's already a bug for that in the mypy tracker, but I can't
>>> find it right now.
>>>
>>> --
>>> --Guido van Rossum (python.org/~guido)
>>> *Pronouns: he/him **(why is my pronoun here?)*
>>> <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
>>>
>> --
> --Guido (mobile)
>
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