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/>
>
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