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Created on 2018-03-20 13:10 by Siyuan Ren, last changed 2022-04-11 14:58 by admin. This issue is now closed.
| Messages (2) | |||
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| msg314141 - (view) | Author: Siyuan Ren (Siyuan Ren) | Date: 2018-03-20 13:10 | |
Currently in module `typing` we have the following classes * SupportsInt * SupportsFloat * SupportsComplex * SupportsBytes * SupportsRound There is no reason that people only need these classes. They may need, say, `SupportsIndex` to denote all integer like types, `SupportsAdd` for arithmetic types, etc. It is best that the list of `SupportsXXX` are expanded to be as complete as possible, and even better, a mechanism for user specified `SupportsXXX` be provided. |
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| msg314154 - (view) | Author: Guido van Rossum (gvanrossum) *  |
Date: 2018-03-20 16:39 | |
Such a mechanism exists, and is called Protocols. See PEP 544 (https://www.python.org/dev/peps/pep-0544/). While the PEP is still in draft, it is supported by mypy. You need to import the 'Protocol' base class from typing_extensions (which is a PyPI module, so use `pip install typing_extensions`). |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:58 | admin | set | github: 77288 |
| 2018-03-20 16:39:03 | gvanrossum | set | status: open -> closed resolution: works for me messages: + msg314154 stage: resolved |
| 2018-03-20 15:27:23 | ned.deily | set | nosy:
+ gvanrossum, levkivskyi |
| 2018-03-20 13:10:42 | Siyuan Ren | create | |