New submission from Rick Teachey <ri...@teachey.org>:
This is broken in 3.7 (both beta 3 and 4):
from __future__ import annotations
from dataclasses import dataclass
from typing import ClassVar, Any
@dataclass
class C():
class_var: ClassVar[Any] = object()
data: str
Traceback:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"C:\Users\ricky\AppData\Local\Programs\Python\Python37\lib\dataclasses.py",
line 850, in dataclass
return wrap(_cls)
File
"C:\Users\ricky\AppData\Local\Programs\Python\Python37\lib\dataclasses.py",
line 842, in wrap
return _process_class(cls, init, repr, eq, order, unsafe_hash, frozen)
File
"C:\Users\ricky\AppData\Local\Programs\Python\Python37\lib\dataclasses.py",
line 763, in _process_class
else 'self',
File
"C:\Users\ricky\AppData\Local\Programs\Python\Python37\lib\dataclasses.py",
line 442, in _init_fn
raise TypeError(f'non-default argument {f.name!r} '
TypeError: non-default argument 'data' follows default argument
----------
components: Library (Lib)
messages: 316333
nosy: Ricyteach, eric.smith
priority: normal
severity: normal
status: open
title: from __future__ import annotations breaks dataclasses ClassVar handling
type: behavior
versions: Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33453>
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