Author eric.smith
Recipients eric.smith, sigurd
Date 2018-06-07.15:15:29
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Marked as misclassified Yes
Message-id <>
Thanks for the report. This is the same error you get when using any non-field:

>>> @dataclass
... class C:
...   i: int
>>> c = C(4)
>>> replace(c, i=3)
>>> replace(c, j=3)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\home\eric\local\python\cpython\lib\", line 1179, in replace
    return obj.__class__(**changes)
TypeError: __init__() got an unexpected keyword argument 'j'

I think the TypeError is correct in both cases. The error message might not be the best.

Are you suggesting that this shouldn't raise a TypeError? Since a ClassVar is not an instance variable, I don't think it makes any sense to replace() it.
Date User Action Args
2018-06-07 15:15:29eric.smithsetrecipients: + eric.smith, sigurd
2018-06-07 15:15:29eric.smithsetmessageid: <>
2018-06-07 15:15:29eric.smithlinkissue33796 messages
2018-06-07 15:15:29eric.smithcreate