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Error occurs when using converters.optional and converters.pipe together #1348

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MioYvo opened this issue Sep 18, 2024 · 0 comments
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@MioYvo
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MioYvo commented Sep 18, 2024

23.2.0 is OK.

Python 3.10.13 (main, Dec  6 2023, 12:01:00) [GCC 13.2.1 20230801] on linux
>>> import attr
>>> attr.__version__
'23.2.0'
>>> @attr.define
... class A:
...     abc: int | None = attr.field(converter=attr.converters.optional(attr.converters.pipe(str, int)), default=None)
...     
>>> A()
A(abc=None)
>>> A('1')
A(abc=1)

after 24.1.0, error occurs:

Python 3.10.13 (main, Dec  6 2023, 12:01:00) [GCC 13.2.1 20230801] on linux
>>> import attr
>>> attr.__version__
'24.2.0'
>>> @attr.define
... class A:
...     abc: int | None = attr.field(converter=attr.converters.optional(attr.converters.pipe(str, int)), default=None)
...     
>>> A()
A(abc=None)
>>> A('1')
Traceback (most recent call last):
  File "/opt/pycharm-professional/plugins/python-ce/helpers/pydev/pydevconsole.py", line 364, in runcode
    coro = func()
  File "<input>", line 1, in <module>
  File "<attrs generated init __main__.A>", line 3, in __init__
  File "/home/mio/Work/venv/calliper310N/lib/python3.10/site-packages/attr/converters.py", line 40, in optional_converter
    return converter(val)
TypeError: Converter.__init__.<locals>.<lambda>() missing 2 required positional arguments: 'instance' and 'field'
@hynek hynek added the Bug label Nov 9, 2024
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