Feature or enhancement

Proposal:

As mentioned here, dataclass definition can possibly be sped up by combining the multiple exec calls into one.

I have two versions, and I found that this results in either a 1.1-1.22 1.26, or 1.37 speedup versus main (old time / new time)

version 1 combines the exec calls by passing a list of name/txt/locals from each function definition.
version 2 simplifies the final exec call to avoid __create_fn__, but I'm not experienced to know if that is safe. (see below for open pr)

@ericvsmith Let me know if this is a suitable change, and if so, which version we should open a pr based on.

Thank you!

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

https://discuss.python.org/t/improving-dataclasses-startup-performance/15442/18

Linked PRs

• gh-109870: Combine exec calls in dataclass #110186
• gh-109870: Dataclasses: batch up exec calls #110851