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These are keyword-only APIs that call `attr.s` and `attr.ib` with different
default values.
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Define an *attrs* class.
Differences to the classic `attr.s` that it uses underneath:
- Automatically detect whether or not *auto_attribs* should be `True` (c.f.
*auto_attribs* parameter).
- Converters and validators run when attributes are set by default -- if
*frozen* is `False`.
- *slots=True*
.. caution::
Usually this has only upsides and few visible effects in everyday
programming. But it *can* lead to some surprising behaviors, so please
make sure to read :term:`slotted classes`.
- *auto_exc=True*
- *auto_detect=True*
- *order=False*
- Some options that were only relevant on Python 2 or were kept around for
backwards-compatibility have been removed.
Please note that these are all defaults and you can change them as you
wish.
:param Optional[bool] auto_attribs: If set to `True` or `False`, it behaves
exactly like `attr.s`. If left `None`, `attr.s` will try to guess:
1. If any attributes are annotated and no unannotated `attrs.fields`\ s
are found, it assumes *auto_attribs=True*.
2. Otherwise it assumes *auto_attribs=False* and tries to collect
`attrs.fields`\ s.
For now, please refer to `attr.s` for the rest of the parameters.
.. versionadded:: 20.1.0
.. versionchanged:: 21.3.0 Converters are also run ``on_setattr``.
.. versionadded:: 22.2.0
*unsafe_hash* as an alias for *hash* (for :pep:`681` compliance).
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removed.
.. versionadded:: 23.1.0
The *type* parameter has been re-added; mostly for `attrs.make_class`.
Please note that type checkers ignore this metadata.
.. versionadded:: 20.1.0
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and dict is always used as *dict_factory*.
.. versionadded:: 21.3.0
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and `tuple` is always used as the *tuple_factory*.
.. versionadded:: 21.3.0
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