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Notably, leaving *on_setattr* as `None` will **not** add any hooks. .. 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). .. deprecated:: 24.1.0 *repr_ns* .. versionchanged:: 24.1.0 Instances are not compared as tuples of attributes anymore, but using a big ``and`` condition. This is faster and has more correct behavior for uncomparable values like `math.nan`. .. versionadded:: 24.1.0 If a class has an *inherited* classmethod called ``__attrs_init_subclass__``, it is executed after the class is created. .. deprecated:: 24.1.0 *hash* is deprecated in favor of *unsafe_hash*. NrzQThe `repr_ns` argument is deprecated and will be removed in or after August 2025.) stacklevelcsp t|}duot|t}o*t|d}|r@|r@d}t|t||t|dd | |}t|dr|dur|t|d}|s|dur| |st|dr| |  durdurt|d rd dur$ d ur$ dur$d }t | d usH durB|d usH|r\rd }t |nL dus dur|dur|dur| nrd }t ||t| d r|n|rd}t |trt|ds|tr rt|ds||S)NTrz/Can't freeze a class with a custom __setattr__.)rrrr)r:r;)rArBrCrDr)Fr&zlInvalid value for cache_hash. To use hash caching, hashing must be either explicitly or implicitly enabled.rzFInvalid value for cache_hash. 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N)rtr<r:r=r;r{rrr_add_eqs  rcCst|d}tdd|D}dd|D}t|d<t|d<t|d<g}|D]N\}}} | r`d |n d |d } |tkrd || fn d ||| f} || qJd|} |durd} n|d} ddddddddddddd| d| ddd g}td!d"|||d#S)$Nr)css6|].}|jdur|j|jdur"tn|j|jfVqdS)FTN)r)rVr,rrrrrs z_make_repr..cSs$i|]\}}}|tkr|d|qS)_repr)r))rrVrrnrrrrsz_make_repr..rrrrxzgetattr(self, "z ", NOTHING)z %s={%s!r}z%s={%s_repr(%s)}rz1{self.__class__.__qualname__.rsplit(">.", 1)[-1]}z.{self.__class__.__name__}zdef __repr__(self):z try:z: already_repring = _compat.repr_context.already_repringz except AttributeError:z! already_repring = {id(self),}z: _compat.repr_context.already_repring = already_repringz else:z# if id(self) in already_repring:z return '...'z else:z# already_repring.add(id(self))z return f'(z)'z finally:z$ already_repring.remove(id(self))rr])rI) rr=rrrr)r_rarZ)rhrrrrZattr_names_with_reprsrIZattribute_fragmentsrVrrdaccessorfragmentZ repr_fragmentZcls_name_fragmentrrrrrsT    rcCs |dur|j}t||||_|S)z% Add a repr method to *cls*. N)rtrr)rrrrhrrr _add_reprsrcCsvt|}|dur&t|ts&d}t|t|dd}|durr|dur`t|dd}|dur`||_|S|d}t||S)aG Return the tuple of *attrs* attributes for a class. The tuple also allows accessing the fields by their names (see below for examples). Args: cls (type): Class to introspect. Raises: TypeError: If *cls* is not a class. attrs.exceptions.NotAnAttrsClassError: If *cls* is not an *attrs* class. Returns: tuple (with name accessors) of `attrs.Attribute` .. versionchanged:: 16.2.0 Returned tuple allows accessing the fields by name. .. versionchanged:: 23.1.0 Add support for generic classes. NPassed object must be a class.rt! is not an attrs-decorated class.)r r;r%r7ryrtr)rrZ generic_baserBrhrrrrs   rcCsJt|tsd}t|t|dd}|dur<|d}t|dd|DS)a Return an ordered dictionary of *attrs* attributes for a class, whose keys are the attribute names. Args: cls (type): Class to introspect. Raises: TypeError: If *cls* is not a class. attrs.exceptions.NotAnAttrsClassError: If *cls* is not an *attrs* class. Returns: dict[str, attrs.Attribute]: Dict of attribute name to definition .. versionadded:: 18.1.0 rrtNrcSsi|] }|j|qSrrrrrrr/rzfields_dict..)r;r%r7ryr)rrrBrhrrr fields_dicts   rcCsDtjdurdSt|jD]&}|j}|dur|||t||jqdS)z Validate all attributes on *inst* that have a validator. Leaves all exceptions through. Args: inst: Instance of a class with *attrs* attributes. FN)rZ_run_validatorsrrr(ryrV)rrrrrrr2s rcCs||}|od|jvS)z> Check if the attribute name comes from a slot class. r)rrq)a_namerrrrrr _is_slot_attrDs rc  Cs6| duo| tju} |r&| r&d} t| |p,|}g}i}|D]b}|jsP|jturPq:|||||j<|jdur|durd} t| d}q:| r:|jtjur:d}q:t |d}t ||||||||| || | rdnd \}}}|j t j vr|t j |j j|t|d|rtj|d<t| r dnd|||}||_|S)Nz$Frozen classes can't use on_setattr.Tr,r8r)r attr_dictr)rrKr8r,r'rr_rVr4r_attrs_to_init_scriptrsysmodulesr rqrrrZ__annotations__)rrrhpre_initpre_init_has_args post_initrrrrrZcls_on_setattrr/has_cls_on_setattrrBneeds_cached_setattrZfiltered_attrsrrrrHrIrr,rrrr1Ls`        r1rlrre value_varhas_on_setattrreturncCsd|d|dS)zJ Use the cached object.setattr to set *attr_name* to *value_var*. _setattr('rwrlrrerrrrr_setattrsr Converterrerrr-rcCsd|d|||dS)zk Use the cached object.setattr to set *attr_name* to *value_var*, but run its converter first. rrwrl)_fmt_converter_callrerrr-rrr_setattr_with_convertersr)rerrrcCs |rt||dSd|d|S)zo Unless *attr_name* has an on_setattr hook, use normal assignment. Otherwise relegate to _setattr. Trxry)r)rerrrrr_assigns rcCs*|rt||d|Sd|d|||S)z Unless *attr_name* has an on_setattr hook, use normal assignment after conversion. Otherwise relegate to _setattr_with_converter. Trxry)rrrrrr_assign_with_convertersrzdict[str, type])rrrcs`|durV|durdttfSdddddfdd }dddddd fd d }d ||fSdttfS) zg Determine the correct setter functions based on whether a class is frozen and/or slotted. Trrlrrcs&t|rt|||Sd|d|SN _inst_dict['z'] = )rrrrrr fmt_setters  z&_determine_setters..fmt_setterrrcs4|st|rt||||Sd|d|||Sr)rrrrrrrfmt_setter_with_converters z5_determine_setters..fmt_setter_with_converter)z_inst_dict = self.__dict__)rrrr)rrrrrrrr_determine_setterss rzlist[Attribute]ztuple[str, dict, dict]) rhr_ is_slotted call_pre_initrcall_post_initdoes_cache_hashrrrr method_namerc $ Cs|r dgng} | r| dt|||\} }}| | g}g}g}i}ddi}|D]}|jrj|||j}|jdup|jtjuo| }|j}t |j t }|r|j j rdnd}|j durt |j tst|j }n|j }|jdur|r`t|jf}|dur4| |||d|d |||j |||j<n| |||d|d ||j j||<nT|dur| ||d |d |||j |||j<n| ||d |d |n|j tur@|s@|d |d }|jr||n |||dur*| ||||||j |||j<n| ||||nb|r@|d }|jrd||n ||| d|dt|jf}|dur| d|||||| d| d|||d|d |||j |||j<nB| d||||| d| d|||d|d ||j j||<nb|jrT||n |||dur| ||||||j |||j<n| |||||jdurT|jdur|dur|j||<qT|durT|jrT|j||<qT|rRt|d<| d|D]L}d|j}d|j}| d|d|d|jd |j||<|||<q|rb| d|r|r|rdtd}n dtd}n dtd}| ||rd d!d"|D} | d#| d d$|}|}!|r@||rd$ndd%d$|7}d$d&d'd(d"|DD}"|!|!r2d$nd7}!|!|"7}!|r\|r\d)|!d | d*<d+}#d,| d|d-| r~|#| nd.d/||fS)0z Return a script of an initializer for *attrs*, a dict of globals, and annotations for the initializer. The globals are required by the generated script. zself.__attrs_pre_init__()z$_setattr = _cached_setattr_get(self)rNrrDFrrlz attr_dict['z '].defaultz =attr_dict['z=NOTHINGzif z is not NOTHING:r[zelse:Trz#if _config._run_validators is True:Z__attr_validator_Z__attr_z(self, z, self.zself.__attrs_post_init__()rz', None)rz '] = Nonerxz = Nonermcss |]}|jrd|jVqdS)rxN)r,rVrrrrrrz(_attrs_to_init_script..zBaseException.__init__(self, rz*, cSsg|]}|d|qS)=r)rZ kw_arg_namerrrrsz)_attrs_to_init_script..css|]}|ddVqdS)rrN)split)rZkwarrrrrzself.__attrs_pre_init__(rz zdef z): passr])r_rrr(rVr4rrKr5r;r'r: takes_selfr-rr,_INIT_FACTORY_PAT_get_global_namerArr/r%_first_param_typerr ra)$rhr_rrrrrrrrrrr extra_linesrrrZ kw_only_argsZattrs_to_validateZnames_for_globalsrrrerZarg_nameZ has_factoryZ maybe_selfr-Zinit_factory_nameargZval_nameZinit_hash_cachevalsZ pre_init_argsZpre_init_kw_only_argsNLrrrrsj                                          "  r)rVrcCs |dS)z The default __init__ parameter name for a field. This performs private-name adjustment via leading-unscore stripping, and is the default value of Attribute.alias if not provided. rn)lstriprrrrrsrc @sTeZdZdZdZdddZddZedd d Zd d Z d dZ ddZ ddZ dS)ra *Read-only* representation of an attribute. .. warning:: You should never instantiate this class yourself. The class has *all* arguments of `attr.ib` (except for ``factory`` which is only syntactic sugar for ``default=Factory(...)`` plus the following: - ``name`` (`str`): The name of the attribute. - ``alias`` (`str`): The __init__ parameter name of the attribute, after any explicit overrides and default private-attribute-name handling. - ``inherited`` (`bool`): Whether or not that attribute has been inherited from a base class. - ``eq_key`` and ``order_key`` (`typing.Callable` or `None`): The callables that are used for comparing and ordering objects by this attribute, respectively. These are set by passing a callable to `attr.ib`'s ``eq``, ``order``, or ``cmp`` arguments. See also :ref:`comparison customization `. Instances of this class are frequently used for introspection purposes like: - `fields` returns a tuple of them. - Validators get them passed as the first argument. - The :ref:`field transformer ` hook receives a list of them. - The ``alias`` property exposes the __init__ parameter name of the field, 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`. )rVr'r(r)r0r1r2r3r+r,r.r%r-r/rvr4r5NFcCst||p | |p|d\} }}}t|}|d||d||d||d||d| |d||d||d ||d ||d ||d | |d | rtt| nt|d| |d| |d||d||d|dS)NTrVr'r(r)r0r1r2r3r+r,r-r.r%r/rvr4r5)r6rrtypesMappingProxyTyper_EMPTY_METADATA_SINGLETON)rrVr'r(r)r*r+r,rvr.r%r-r/r0r1r2r3r4r5 bound_setattrrrrrC s4                 zAttribute.__init__cCstdSr")rrrrrrz szAttribute.__setattr__c sZ|durj}njdur&d}t|fddtjD}|f|jj|ddd|S)Nz8Type annotation and type argument cannot both be presentcs i|]}|dvr|t|qS))rVr(r'r%rvr)rrrrrr s z0Attribute.from_counting_attr..F)rVr(r'r%r*rv)r%r8rr _validator_default)rrrVrr%rB inst_dictrrrr} s$   zAttribute.from_counting_attrcKst|}|||S)a  Copy *self* and apply *changes*. 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Running into is most likely the result of a bug like a forgotten `@attr.s` decorator. )rrr5r-rr0r1r+r,r/r.r4r2r3r)r%ccs8|]0}t|t|tdddddddddddddVqdS)NTFrVr5r'r(r)r*r+r,r/r0r1r2r3rvr4)rrrrrrrr s$z_CountingAttr.) rrr)r0r2r+r,r4r5r.NTFrrcCsttjd7_tj|_||_||_||_||_| |_| |_| |_ ||_ ||_ ||_ ||_ | |_| |_||_||_dSr)r@ cls_counterrrrr-r)r0r1r2r3r+r,r.r%r/r4r5)rr'r(r)r*r+r,r-r.r%r/r0r1r2r3r4r5rrrr5 s"z_CountingAttr.__init__cCs$|jdur||_nt|j||_|S)z Decorator that adds *meth* to the list of validators. Returns *meth* unchanged. .. versionadded:: 17.1.0 N)rr?rr@rrrr(Z s z_CountingAttr.validatorcCs |jturtt|dd|_|S)z Decorator that allows to set the default for an attribute. Returns *meth* unchanged. Raises: DefaultAlreadySetError: If default has been set before. .. versionadded:: 17.1.0 T)r)rrrr:rrrrr'h s z_CountingAttr.default) rrrrrr=rrtrrr(r'rrrrr@ s:1%r@c@s.eZdZdZdZd ddZddZdd Zd S) r:a Stores a factory callable. If passed as the default value to `attrs.field`, the factory is used to generate a new value. Args: factory (typing.Callable): A callable that takes either none or exactly one mandatory positional argument depending on *takes_self*. takes_self (bool): Pass the partially initialized instance that is being initialized as a positional argument. .. versionadded:: 17.1.0 *takes_self* rArFcCs||_||_dSr"r)rrArrrrr szFactory.__init__cstfddjDS)rc3s|]}t|VqdSr"rrrrrr rz'Factory.__getstate__..rrrrrr szFactory.__getstate__cCs&t|j|D]\}}t|||q dSr)r%rr)rr&rVrrrrr szFactory.__setstate__N)F)rrrrrrrrrrrrr:~ s  r:cCs(g|] }t|tddddddddd qSNTF) rVr'r(r)r*r0r2r+r,rvrrrrrrr s c@sZeZdZdZdZdddddZedddd d Zdddd d d ZddZ ddZ dS)rae Stores a converter callable. Allows for the wrapped converter to take additional arguments. The arguments are passed in the order they are documented. Args: converter (Callable): A callable that converts the passed value. takes_self (bool): Pass the partially initialized instance that is being initialized as a positional argument. (default: `False`) takes_field (bool): Pass the field definition (an :class:`Attribute`) into the converter as a positional argument. (default: `False`) .. versionadded:: 24.1.0 )__call__rZ _global_namer- takes_fieldrFrrcs|_|_|_t|}|_js@js@fdd_nFjr\js\fdd_n*jsxjrxfdd_nfdd_|}|dur|jjd<dS)Ncs |Sr"r-)rrn__rrrr rz$Converter.__init__..cs ||Sr"r)rinstancerrrrr scs ||Sr"r)rrr5rrrr scs|||Sr"r)rrr5rrrr sr) r-rrr get_first_param_typerrget_return_typer)rr-rrexrtrrrr s    zConverter.__init__rl)rercCs d|S)zh Return the name that a converter for an attribute name *attr_name* would have. Z__attr_converter_r)rerrrr szConverter._get_global_name)rerrcCs|js"|js"||d|dS|jrJ|jrJ||d|d|dS|jrf||d|dS||d|d|dS)z Return a string that calls the converter for an attribute name *attr_name* and the value in variable named *value_var* according to `self.takes_self` and `self.takes_field`. rrlz, self, attr_dict['z'])z, self)z , attr_dict[')rrr)rrerrrrr s  zConverter._fmt_converter_callcCs|j|j|jdS)zx Return a dict containing only converter and takes_self -- the rest gets computed when loading. r-rrrrrrrr szConverter.__getstate__cCs|jfi|dS)z+ Load instance from state. Nr\rrrrr szConverter.__setstate__N) rrrrrrrrrrrrrrrr s  cCs(g|] }t|tddddddddd qSrrrrrrr s rc  s^t|tr|}n*t|ttfr.dd|D}n d}t||dd}|dd}|dd} i|durt||dur|d<|dur|d<| dur| d<t||ifdd } t t t &t d jd d | _Wdn1s0Y|d d} t| |d|dd\|d<|d<tfd|i|| } dd|D| _| S)a A quick way to create a new class called *name* with *attrs*. .. note:: ``make_class()`` is a thin wrapper around `attr.s`, not `attrs.define` which means that it doesn't come with some of the improved defaults. For example, if you want the same ``on_setattr`` behavior as in `attrs.define`, you have to pass the hooks yourself: ``make_class(..., on_setattr=setters.pipe(setters.convert, setters.validate)`` Args: name (str): The name for the new class. attrs (list | dict): A list of names or a dictionary of mappings of names to `attr.ib`\ s / `attrs.field`\ s. The order is deduced from the order of the names or attributes inside *attrs*. Otherwise the order of the definition of the attributes is used. bases (tuple[type, ...]): Classes that the new class will subclass. class_body (dict): An optional dictionary of class attributes for the new class. attributes_arguments: Passed unmodified to `attr.s`. Returns: type: A new class with *attrs*. .. versionadded:: 17.1.0 *bases* .. versionchanged:: 18.1.0 If *attrs* is ordered, the order is retained. .. versionchanged:: 23.2.0 *class_body* cSsi|] }|tqSr)rCrrrrr\ rzmake_class..z(attrs argument must be a dict or a list.rNrrcs |Sr")r )rbodyrrro rzmake_class..rr__main__r*r0r2TrcSs"i|]\}}|jdur||jqSr")r%rrrrr s)r;rr<r=r7popr r new_classrrrr8r _getframe f_globalsrrrTrrr) rVrhbasesZ class_bodyZattributes_argumentsZcls_dictrBrrZ user_inittype_r*rrrrr make_class1 sL(      $ r)rrhc@seZdZdZeZddZdS) _AndValidatorz2 Compose many validators to a single one. cCs|jD]}||||qdSr") _validators)rrrrrrrrr s z_AndValidator.__call__N)rrrrrCrrrrrrr srcGs6g}|D] }|t|tr |jn|gqtt|S)a A validator that composes multiple validators into one. When called on a value, it runs all wrapped validators. Args: validators (~collections.abc.Iterable[typing.Callable]): Arbitrary number of validators. .. versionadded:: 17.1.0 )rr;rrr=)Z validatorsrr(rrrr? s r?cstddD}|r$fdd}n fdd}sRtd}|j||dnTtd}|rp||jd <d }tst|t r|j }t| }|r||jd <|rt |d d d S|S)a A converter that composes multiple converters into one. When called on a value, it runs all wrapped converters, returning the *last* value. Type annotations will be inferred from the wrapped converters', if they have any. converters (~collections.abc.Iterable[typing.Callable]): Arbitrary number of converters. .. versionadded:: 20.1.0 css|]}t|tVqdSr"r;r)rcrrrr rzpipe..cs,D]"}t|tr||||n||}q|Sr"r)rHrr5r convertersrrpipe_converter szpipe..pipe_convertercsD] }||}q|Sr"r)rHrrrrr s A)rHrrrHrNrTr) rRtypingTypeVarrr r rr r;rrr)rZreturn_instancerrtlastrrrrr> s&     r>)NrD)N)T)NNNNNNNFFTFFFFFNNFFNNNTN)N)NN)c __future__rrrrrrrrrSrrroperatorrrDrrrrr r r r r exceptionsrrrrobjectrrrror rrrr>rrrEnumrrintr!rCrMrZrfrgrprsrrrrrrrzrrTr6rYrhrr]rr,r|r=r<rErrrrrrr1rrrrrrrrrZ_ar@r:Z_frrrr?rrrrs,       k  m: : ,  a G&8 9 .O   /& L     ' d  a