[issue44649] dataclasses slots with init=False field raises AttributeException

miss-islington added the comment: New changeset 10343bd98390ef15909e3a19f26a6178162996fd by Miss Islington (bot) in branch '3.10': bpo-44649: Fix dataclasses(slots=True) with a field with a default, but init=False (GH-29692)

[issue44649] dataclasses slots with init=False field raises AttributeException

Eric V. Smith added the comment: Thanks for the bug report! -- resolution: -> fixed stage: patch review -> resolved status: open -> closed ___ Python tracker ___

[issue44649] dataclasses slots with init=False field raises AttributeException

Eric V. Smith added the comment: New changeset d3062f672c92855b7e9e962ad4bf1a67abd4589b by Eric V. Smith in branch 'main': bpo-44649: Fix dataclasses(slots=True) with a field with a default, but init=False (GH-29692)

[issue44649] dataclasses slots with init=False field raises AttributeException

Change by miss-islington : -- nosy: +miss-islington nosy_count: 2.0 -> 3.0 pull_requests: +27940 pull_request: https://github.com/python/cpython/pull/29704 ___ Python tracker

[issue44649] dataclasses slots with init=False field raises AttributeException

Change by Eric V. Smith : -- versions: +Python 3.11 ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue44649] dataclasses slots with init=False field raises AttributeException

Change by Eric V. Smith : -- keywords: +patch pull_requests: +27930 stage: -> patch review pull_request: https://github.com/python/cpython/pull/29692 ___ Python tracker ___

[issue44649] dataclasses slots with init=False field raises AttributeException

Christodoulos Tsoulloftas added the comment: Thanks for the update eric, yeah the new error messages are much more comprehensive and I am glad to hear the original issue will be addressed as well. -- ___ Python tracker

[issue44649] dataclasses slots with init=False field raises AttributeException

Eric V. Smith added the comment: With Pablo's changes, the error now reads (in 3.11): obj.b ^ AttributeError: 'Example' object has no attribute 'b' Which is a vast improvement! I'm working on a PR to initialize obj.b in __init__. --

[issue44649] dataclasses slots with init=False field raises AttributeException

Eric V. Smith added the comment: I created issue 44655 for the confusing error message. The problem with dataclasses is that the instance variable 'b' needs to be initialized, instead of the current dataclasses behavior where it relies on the class variable when reading 'b'. --

[issue44649] dataclasses slots with init=False field raises AttributeException

Change by Eric V. Smith : -- assignee: -> eric.smith nosy: +eric.smith ___ Python tracker ___ ___ Python-bugs-list mailing list

[issue44649] dataclasses slots with init=False field raises AttributeException

New submission from Christodoulos Tsoulloftas : I am trying the new slots directive but I get an AttributeError when I try to access a field with init=False >>> from dataclasses import dataclass, field >>> >>> @dataclass(slots=True) ... class Example: ... a: str ... b: str =