[Python-Dev] PEP 557: Data Classes (original) (raw)

tds333 at mailbox.org tds333 at mailbox.org
Mon Sep 11 09:43:45 EDT 2017

Hi Eric,

I have on question not addressed yet. The implementation is based on "annotations" where the type is specified. But "annotations" is not always filled. An interpreter version with special optimization could remove all annotations for performance reasons. (Discussed in other threads)

In this case the dataclass does not work or will there be a fallback?

I know it is a little bit hypothetical because an interpreter with this optimization is not there yet. I am looking only in the future a bit. Asking this because type annotations are stated as completely optional for Python. And this use case will break this assumption.

Personally I am a heavy user of attrs and happy to have a dataclass in the std lib.

Regards

Wolfgang

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