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Sentinel to indicate the lack of a value when ``None`` is ambiguous.
If extending attrs, you can use ``typing.Literal[NOTHING]`` to show
that a value may be ``NOTHING``.
.. versionchanged:: 21.1.0 ``bool(NOTHING)`` is now False.
.. versionchanged:: 22.2.0 ``NOTHING`` is now an ``enum.Enum`` variant.
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An integer subclass that pickles / copies as None
This is used for non-slots classes with ``cache_hash=True``, to avoid
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Create a new attribute on a class.
.. warning::
Does *not* do anything unless the class is also decorated with
`attr.s` / `attrs.define` / et cetera!
Please consider using `attrs.field` in new code (``attr.ib`` will *never*
go away, though).
:param default: A value that is used if an *attrs*-generated ``__init__``
is used and no value is passed while instantiating or the attribute is
excluded using ``init=False``.
If the value is an instance of `attrs.Factory`, its callable will be
used to construct a new value (useful for mutable data types like lists
or dicts).
If a default is not set (or set manually to `attrs.NOTHING`), a value
*must* be supplied when instantiating; otherwise a `TypeError`
will be raised.
The default can also be set using decorator notation as shown below.
:type default: Any value
:param callable factory: Syntactic sugar for
``default=attr.Factory(factory)``.
:param validator: `callable` that is called by *attrs*-generated
``__init__`` methods after the instance has been initialized. They
receive the initialized instance, the :func:`~attrs.Attribute`, and the
passed value.
The return value is *not* inspected so the validator has to throw an
exception itself.
If a `list` is passed, its items are treated as validators and must
all pass.
Validators can be globally disabled and re-enabled using
`attrs.validators.get_disabled` / `attrs.validators.set_disabled`.
The validator can also be set using decorator notation as shown below.
:type validator: `callable` or a `list` of `callable`\ s.
:param repr: Include this attribute in the generated ``__repr__``
method. If ``True``, include the attribute; if ``False``, omit it. By
default, the built-in ``repr()`` function is used. To override how the
attribute value is formatted, pass a ``callable`` that takes a single
value and returns a string. Note that the resulting string is used
as-is, i.e. it will be used directly *instead* of calling ``repr()``
(the default).
:type repr: a `bool` or a `callable` to use a custom function.
:param eq: If ``True`` (default), include this attribute in the
generated ``__eq__`` and ``__ne__`` methods that check two instances
for equality. To override how the attribute value is compared,
pass a ``callable`` that takes a single value and returns the value
to be compared.
:type eq: a `bool` or a `callable`.
:param order: If ``True`` (default), include this attributes in the
generated ``__lt__``, ``__le__``, ``__gt__`` and ``__ge__`` methods.
To override how the attribute value is ordered,
pass a ``callable`` that takes a single value and returns the value
to be ordered.
:type order: a `bool` or a `callable`.
:param cmp: Setting *cmp* is equivalent to setting *eq* and *order* to the
same value. Must not be mixed with *eq* or *order*.
:type cmp: a `bool` or a `callable`.
:param Optional[bool] hash: Include this attribute in the generated
``__hash__`` method. If ``None`` (default), mirror *eq*'s value. This
is the correct behavior according the Python spec. Setting this value
to anything else than ``None`` is *discouraged*.
:param bool init: Include this attribute in the generated ``__init__``
method. It is possible to set this to ``False`` and set a default
value. In that case this attributed is unconditionally initialized
with the specified default value or factory.
:param callable converter: `callable` that is called by
*attrs*-generated ``__init__`` methods to convert attribute's value
to the desired format. It is given the passed-in value, and the
returned value will be used as the new value of the attribute. The
value is converted before being passed to the validator, if any.
:param metadata: An arbitrary mapping, to be used by third-party
components. See `extending-metadata`.
:param type: The type of the attribute. Nowadays, the preferred method to
specify the type is using a variable annotation (see :pep:`526`).
This argument is provided for backward compatibility.
Regardless of the approach used, the type will be stored on
``Attribute.type``.
Please note that *attrs* doesn't do anything with this metadata by
itself. You can use it as part of your own code or for
`static type checking `.
:param kw_only: Make this attribute keyword-only in the generated
``__init__`` (if ``init`` is ``False``, this parameter is ignored).
:param on_setattr: Allows to overwrite the *on_setattr* setting from
`attr.s`. If left `None`, the *on_setattr* value from `attr.s` is used.
Set to `attrs.setters.NO_OP` to run **no** `setattr` hooks for this
attribute -- regardless of the setting in `attr.s`.
:type on_setattr: `callable`, or a list of callables, or `None`, or
`attrs.setters.NO_OP`
:param Optional[str] alias: Override this attribute's parameter name in the
generated ``__init__`` method. If left `None`, default to ``name``
stripped of leading underscores. See `private-attributes`.
.. versionadded:: 15.2.0 *convert*
.. versionadded:: 16.3.0 *metadata*
.. versionchanged:: 17.1.0 *validator* can be a ``list`` now.
.. versionchanged:: 17.1.0
*hash* is ``None`` and therefore mirrors *eq* by default.
.. versionadded:: 17.3.0 *type*
.. deprecated:: 17.4.0 *convert*
.. versionadded:: 17.4.0 *converter* as a replacement for the deprecated
*convert* to achieve consistency with other noun-based arguments.
.. versionadded:: 18.1.0
``factory=f`` is syntactic sugar for ``default=attr.Factory(f)``.
.. versionadded:: 18.2.0 *kw_only*
.. versionchanged:: 19.2.0 *convert* keyword argument removed.
.. versionchanged:: 19.2.0 *repr* also accepts a custom callable.
.. deprecated:: 19.2.0 *cmp* Removal on or after 2021-06-01.
.. versionadded:: 19.2.0 *eq* and *order*
.. versionadded:: 20.1.0 *on_setattr*
.. versionchanged:: 20.3.0 *kw_only* backported to Python 2
.. versionchanged:: 21.1.0
*eq*, *order*, and *cmp* also accept a custom callable
.. versionchanged:: 21.1.0 *cmp* undeprecated
.. versionadded:: 22.2.0 *alias*
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A class decorator that adds :term:`dunder methods` according to the
specified attributes using `attr.ib` or the *these* argument.
Please consider using `attrs.define` / `attrs.frozen` in new code
(``attr.s`` will *never* go away, though).
:param these: A dictionary of name to `attr.ib` mappings. This is
useful to avoid the definition of your attributes within the class body
because you can't (e.g. if you want to add ``__repr__`` methods to
Django models) or don't want to.
If *these* is not ``None``, *attrs* will *not* search the class body
for attributes and will *not* remove any attributes from it.
The order is deduced from the order of the attributes inside *these*.
:type these: `dict` of `str` to `attr.ib`
:param str repr_ns: When using nested classes, there's no way in Python 2
to automatically detect that. Therefore it's possible to set the
namespace explicitly for a more meaningful ``repr`` output.
:param bool auto_detect: Instead of setting the *init*, *repr*, *eq*,
*order*, and *hash* arguments explicitly, assume they are set to
``True`` **unless any** of the involved methods for one of the
arguments is implemented in the *current* class (i.e. it is *not*
inherited from some base class).
So for example by implementing ``__eq__`` on a class yourself,
*attrs* will deduce ``eq=False`` and will create *neither*
``__eq__`` *nor* ``__ne__`` (but Python classes come with a sensible
``__ne__`` by default, so it *should* be enough to only implement
``__eq__`` in most cases).
.. warning::
If you prevent *attrs* from creating the ordering methods for you
(``order=False``, e.g. by implementing ``__le__``), it becomes
*your* responsibility to make sure its ordering is sound. The best
way is to use the `functools.total_ordering` decorator.
Passing ``True`` or ``False`` to *init*, *repr*, *eq*, *order*,
*cmp*, or *hash* overrides whatever *auto_detect* would determine.
:param bool repr: Create a ``__repr__`` method with a human readable
representation of *attrs* attributes..
:param bool str: Create a ``__str__`` method that is identical to
``__repr__``. This is usually not necessary except for
`Exception`\ s.
:param Optional[bool] eq: If ``True`` or ``None`` (default), add ``__eq__``
and ``__ne__`` methods that check two instances for equality.
They compare the instances as if they were tuples of their *attrs*
attributes if and only if the types of both classes are *identical*!
:param Optional[bool] order: If ``True``, add ``__lt__``, ``__le__``,
``__gt__``, and ``__ge__`` methods that behave like *eq* above and
allow instances to be ordered. If ``None`` (default) mirror value of
*eq*.
:param Optional[bool] cmp: Setting *cmp* is equivalent to setting *eq*
and *order* to the same value. Must not be mixed with *eq* or *order*.
:param Optional[bool] unsafe_hash: If ``None`` (default), the ``__hash__``
method is generated according how *eq* and *frozen* are set.
1. If *both* are True, *attrs* will generate a ``__hash__`` for you.
2. If *eq* is True and *frozen* is False, ``__hash__`` will be set to
None, marking it unhashable (which it is).
3. If *eq* is False, ``__hash__`` will be left untouched meaning the
``__hash__`` method of the base class will be used (if base class is
``object``, this means it will fall back to id-based hashing.).
Although not recommended, you can decide for yourself and force
*attrs* to create one (e.g. if the class is immutable even though you
didn't freeze it programmatically) by passing ``True`` or not. Both of
these cases are rather special and should be used carefully.
See our documentation on `hashing`, Python's documentation on
`object.__hash__`, and the `GitHub issue that led to the default \
behavior `_ for more
details.
:param Optional[bool] hash: Alias for *unsafe_hash*. *unsafe_hash* takes
precedence.
:param bool init: Create a ``__init__`` method that initializes the
*attrs* attributes. Leading underscores are stripped for the argument
name. If a ``__attrs_pre_init__`` method exists on the class, it will
be called before the class is initialized. If a ``__attrs_post_init__``
method exists on the class, it will be called after the class is fully
initialized.
If ``init`` is ``False``, an ``__attrs_init__`` method will be
injected instead. This allows you to define a custom ``__init__``
method that can do pre-init work such as ``super().__init__()``,
and then call ``__attrs_init__()`` and ``__attrs_post_init__()``.
:param bool slots: Create a :term:`slotted class ` that's
more memory-efficient. Slotted classes are generally superior to the
default dict classes, but have some gotchas you should know about, so
we encourage you to read the :term:`glossary entry `.
:param bool frozen: Make instances immutable after initialization. If
someone attempts to modify a frozen instance,
`attrs.exceptions.FrozenInstanceError` is raised.
.. note::
1. This is achieved by installing a custom ``__setattr__`` method
on your class, so you can't implement your own.
2. True immutability is impossible in Python.
3. This *does* have a minor a runtime performance `impact
` when initializing new instances. In other words:
``__init__`` is slightly slower with ``frozen=True``.
4. If a class is frozen, you cannot modify ``self`` in
``__attrs_post_init__`` or a self-written ``__init__``. You can
circumvent that limitation by using
``object.__setattr__(self, "attribute_name", value)``.
5. Subclasses of a frozen class are frozen too.
:param bool weakref_slot: Make instances weak-referenceable. This has no
effect unless ``slots`` is also enabled.
:param bool auto_attribs: If ``True``, collect :pep:`526`-annotated
attributes from the class body.
In this case, you **must** annotate every field. If *attrs*
encounters a field that is set to an `attr.ib` but lacks a type
annotation, an `attr.exceptions.UnannotatedAttributeError` is
raised. Use ``field_name: typing.Any = attr.ib(...)`` if you don't
want to set a type.
If you assign a value to those attributes (e.g. ``x: int = 42``), that
value becomes the default value like if it were passed using
``attr.ib(default=42)``. Passing an instance of `attrs.Factory` also
works as expected in most cases (see warning below).
Attributes annotated as `typing.ClassVar`, and attributes that are
neither annotated nor set to an `attr.ib` are **ignored**.
.. warning::
For features that use the attribute name to create decorators (e.g.
:ref:`validators `), you still *must* assign `attr.ib`
to them. Otherwise Python will either not find the name or try to
use the default value to call e.g. ``validator`` on it.
These errors can be quite confusing and probably the most common bug
report on our bug tracker.
:param bool kw_only: Make all attributes keyword-only
in the generated ``__init__`` (if ``init`` is ``False``, this
parameter is ignored).
:param bool cache_hash: Ensure that the object's hash code is computed
only once and stored on the object. If this is set to ``True``,
hashing must be either explicitly or implicitly enabled for this
class. If the hash code is cached, avoid any reassignments of
fields involved in hash code computation or mutations of the objects
those fields point to after object creation. If such changes occur,
the behavior of the object's hash code is undefined.
:param bool auto_exc: If the class subclasses `BaseException`
(which implicitly includes any subclass of any exception), the
following happens to behave like a well-behaved Python exceptions
class:
- the values for *eq*, *order*, and *hash* are ignored and the
instances compare and hash by the instance's ids (N.B. *attrs* will
*not* remove existing implementations of ``__hash__`` or the equality
methods. It just won't add own ones.),
- all attributes that are either passed into ``__init__`` or have a
default value are additionally available as a tuple in the ``args``
attribute,
- the value of *str* is ignored leaving ``__str__`` to base classes.
:param bool collect_by_mro: Setting this to `True` fixes the way *attrs*
collects attributes from base classes. The default behavior is
incorrect in certain cases of multiple inheritance. It should be on by
default but is kept off for backward-compatibility.
See issue `#428 `_ for
more details.
:param Optional[bool] getstate_setstate:
.. note::
This is usually only interesting for slotted classes and you should
probably just set *auto_detect* to `True`.
If `True`, ``__getstate__`` and
``__setstate__`` are generated and attached to the class. This is
necessary for slotted classes to be pickleable. If left `None`, it's
`True` by default for slotted classes and ``False`` for dict classes.
If *auto_detect* is `True`, and *getstate_setstate* is left `None`,
and **either** ``__getstate__`` or ``__setstate__`` is detected directly
on the class (i.e. not inherited), it is set to `False` (this is usually
what you want).
:param on_setattr: A callable that is run whenever the user attempts to set
an attribute (either by assignment like ``i.x = 42`` or by using
`setattr` like ``setattr(i, "x", 42)``). It receives the same arguments
as validators: the instance, the attribute that is being modified, and
the new value.
If no exception is raised, the attribute is set to the return value of
the callable.
If a list of callables is passed, they're automatically wrapped in an
`attrs.setters.pipe`.
:type on_setattr: `callable`, or a list of callables, or `None`, or
`attrs.setters.NO_OP`
:param Optional[callable] field_transformer:
A function that is called with the original class object and all
fields right before *attrs* finalizes the class. You can use
this, e.g., to automatically add converters or validators to
fields based on their types. See `transform-fields` for more details.
:param bool match_args:
If `True` (default), set ``__match_args__`` on the class to support
:pep:`634` (Structural Pattern Matching). It is a tuple of all
non-keyword-only ``__init__`` parameter names on Python 3.10 and later.
Ignored on older Python versions.
.. versionadded:: 16.0.0 *slots*
.. versionadded:: 16.1.0 *frozen*
.. versionadded:: 16.3.0 *str*
.. versionadded:: 16.3.0 Support for ``__attrs_post_init__``.
.. versionchanged:: 17.1.0
*hash* supports ``None`` as value which is also the default now.
.. versionadded:: 17.3.0 *auto_attribs*
.. versionchanged:: 18.1.0
If *these* is passed, no attributes are deleted from the class body.
.. versionchanged:: 18.1.0 If *these* is ordered, the order is retained.
.. versionadded:: 18.2.0 *weakref_slot*
.. deprecated:: 18.2.0
``__lt__``, ``__le__``, ``__gt__``, and ``__ge__`` now raise a
`DeprecationWarning` if the classes compared are subclasses of
each other. ``__eq`` and ``__ne__`` never tried to compared subclasses
to each other.
.. versionchanged:: 19.2.0
``__lt__``, ``__le__``, ``__gt__``, and ``__ge__`` now do not consider
subclasses comparable anymore.
.. versionadded:: 18.2.0 *kw_only*
.. versionadded:: 18.2.0 *cache_hash*
.. versionadded:: 19.1.0 *auto_exc*
.. deprecated:: 19.2.0 *cmp* Removal on or after 2021-06-01.
.. versionadded:: 19.2.0 *eq* and *order*
.. versionadded:: 20.1.0 *auto_detect*
.. versionadded:: 20.1.0 *collect_by_mro*
.. versionadded:: 20.1.0 *getstate_setstate*
.. versionadded:: 20.1.0 *on_setattr*
.. versionadded:: 20.3.0 *field_transformer*
.. versionchanged:: 21.1.0
``init=False`` injects ``__attrs_init__``
.. versionchanged:: 21.1.0 Support for ``__attrs_pre_init__``
.. versionchanged:: 21.1.0 *cmp* undeprecated
.. versionadded:: 21.3.0 *match_args*
.. versionadded:: 22.2.0
*unsafe_hash* as an alias for *hash* (for :pep:`681` compliance).
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.. versionadded:: 18.1.0
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them.
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with any overrides and default private-attribute handling applied.
.. versionadded:: 20.1.0 *inherited*
.. versionadded:: 20.1.0 *on_setattr*
.. versionchanged:: 20.2.0 *inherited* is not taken into account for
equality checks and hashing anymore.
.. versionadded:: 21.1.0 *eq_key* and *order_key*
.. versionadded:: 22.2.0 *alias*
For the full version history of the fields, see `attr.ib`.
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.. versionadded:: 17.1.0 *bases*
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.. versionadded:: 20.1.0
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