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At runtime it is equivalent to a plain dict. TypedDict creates a dictionary type that expects all of its instances to have a certain set of keys, with each key associated with a value of a consistent type. This expectation is not checked at runtime but is only enforced by type checkers. Usage:: class Point2D(TypedDict): x: int y: int label: str a: Point2D = {'x': 1, 'y': 2, 'label': 'good'} # OK b: Point2D = {'z': 3, 'label': 'bad'} # Fails type check assert Point2D(x=1, y=2, label='first') == dict(x=1, y=2, label='first') The type info can be accessed via the Point2D.__annotations__ dict, and the Point2D.__required_keys__ and Point2D.__optional_keys__ frozensets. TypedDict supports two additional equivalent forms:: Point2D = TypedDict('Point2D', x=int, y=int, label=str) Point2D = TypedDict('Point2D', {'x': int, 'y': int, 'label': str}) The class syntax is only supported in Python 3.6+, while two other syntax forms work for Python 2.7 and 3.2+ r+csHeZdZdZfddZddZddZdd Zd d Zd d Z Z S)_AnnotatedAliasaKRuntime representation of an annotated type. At its core 'Annotated[t, dec1, dec2, ...]' is an alias for the type 't' with extra annotations. 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Details: - It's an error to call `Annotated` with less than two arguments. - Nested Annotated are flattened:: Annotated[Annotated[T, Ann1, Ann2], Ann3] == Annotated[T, Ann1, Ann2, Ann3] - Instantiating an annotated type is equivalent to instantiating the underlying type:: Annotated[C, Ann1](5) == C(5) - Annotated can be used as a generic type alias:: Optimized = Annotated[T, runtime.Optimize()] Optimized[int] == Annotated[int, runtime.Optimize()] OptimizedList = Annotated[List[T], runtime.Optimize()] OptimizedList[int] == Annotated[List[int], runtime.Optimize()] r cOr>)Nz&Type Annotated cannot be instantiated.r?rrr r r r rrDzAnnotated.__new__cCsLt|tr t|dkrtdd}t|d|}t|dd}t||S)NrUzUAnnotated[...] should be used with at least two arguments (a type and an annotation).$Annotated[t, ...]: t must be a type.rrw)rrrrrbrcr)rr$rrZrr r r r&s  zAnnotated.__class_getitem__cOstd|jd)NCannot subclass z .Annotated)rrIrr r r rKs zAnnotated.__init_subclass__N) rHrIrJrKrrrbrLr&rKr r r r r+s   cCs\t|tr t|jSt|tjr,tdd|jD}||jkr!|S||}|j |_ |S|S)z2Strips the annotations from a given type. csr/rq_strip_annotationsrPr r r rr2z%_strip_annotations..) rrrrrbrdrrr_special)r, stripped_argsrr r r rs     rFcCs*tj|||d}|r |Sdd|DS)a]Return type hints for an object. This is often the same as obj.__annotations__, but it handles forward references encoded as string literals, adds Optional[t] if a default value equal to None is set and recursively replaces all 'Annotated[T, ...]' with 'T' (unless 'include_extras=True'). The argument may be a module, class, method, or function. The annotations are returned as a dictionary. For classes, annotations include also inherited members. TypeError is raised if the argument is not of a type that can contain annotations, and an empty dictionary is returned if no annotations are present. BEWARE -- the behavior of globalns and localns is counterintuitive (unless you are familiar with how eval() and exec() work). The search order is locals first, then globals. - If no dict arguments are passed, an attempt is made to use the globals from obj (or the respective module's globals for classes), and these are also used as the locals. If the object does not appear to have globals, an empty dictionary is used. - If one dict argument is passed, it is used for both globals and locals. - If two dict arguments are passed, they specify globals and locals, respectively. )rrcSsi|] \}}|t|qSr r)rkr,r r r rzsz"get_type_hints..)rbr:r~)rBrrinclude_extrashintr r r r:sr:cCs t|dko|do|dS)z3Returns True if name is a __dunder_variable_name__.__)rrendswithrr r r _is_dunders rcseZdZdZfddZeddZddZdfd d Zd d Z e j fd dZ ddZ ddZfddZddZddZZS) AnnotatedMetazMetaclass for Annotatedc s<tdd|Drtdtttj||||fi|S)Ncss|]}|tuVqdSrq)rBr5r r r r r2z(AnnotatedMeta.__new__..r)rArr*r+rr)rrrXrYr rr r r szAnnotatedMeta.__new__cCs |dS)NrU)rRr\r r r r zAnnotatedMeta.__metadata__cCsX|\}}}t|tst|}n|d|}ddd|D}|d|d|dS)Nrrcsr/rqrrargr r r rr2z+AnnotatedMeta._tree_repr..rr)rrrbr _tree_reprr)rAtreerrZrZtp_reprZmetadata_reprsr r r rs   zAnnotatedMeta._tree_reprNcsh|turtStj||d}t|dtr2|ddtur2|dd}|dd}t|||dfS|S)N)rErrwrrU)r+rrRrr)rArErrZsub_tpZ sub_annotrr r rRs  zAnnotatedMeta._subs_treecCsd|jdur td|}t|tr'|dtur'|d}t|tr'|dtust|tr0|dS|S)z6Return the class used to create instance of this type.NzCCannot get the underlying type of a non-specialized Annotated type.rrw)rrrRrrr+)rArr r r _get_cons's  zAnnotatedMeta._get_conscst|ts|f}|jdurt|St|trt|dkr"tdd}t|d|}t|dd}|j |j |j t |j t|f||f|dS)NrUz]Annotated[...] should be instantiated with at least two arguments (a type and an annotation).rrrw)rErrZ)rrrrrgrrrbrcrrHr@r rr)rAr$rrsrrr r rg4s"   zAnnotatedMeta.__getitem__cOs8|}||i|}z||_W|StyY|Swrq)r__orig_class__rf)rArr Zconsresultr r r __call__Ls zAnnotatedMeta.__call__cCs(|jdurt|st||St|rq)rrrrrf)rArr r r __getattr__UszAnnotatedMeta.__getattr__csJt|s |drt||dS|jdurt|t|||dS)Nr)rrrrUrrfsetattrr)rArvaluerr r rU[s  zAnnotatedMeta.__setattr__cCr>)Nz+Annotated cannot be used with isinstance().r?r@r r r rCcrDzAnnotatedMeta.__instancecheck__cCr>)Nz+Annotated cannot be used with issubclass().r?rEr r r rFfrDzAnnotatedMeta.__subclasscheck__)NN)rHrIrJrKrpropertyrrrRrrbrLrgrrrUrCrFrr r rr rs      rc@r)r+avAdd context specific metadata to a type. Example: Annotated[int, runtime_check.Unsigned] indicates to the hypothetical runtime_check module that this type is an unsigned int. Every other consumer of this type can ignore this metadata and treat this type as int. The first argument to Annotated must be a valid type, the remaining arguments are kept as a tuple in the __metadata__ field. Details: - It's an error to call `Annotated` with less than two arguments. - Nested Annotated are flattened:: Annotated[Annotated[T, Ann1, Ann2], Ann3] == Annotated[T, Ann1, Ann2, Ann3] - Instantiating an annotated type is equivalent to instantiating the underlying type:: Annotated[C, Ann1](5) == C(5) - Annotated can be used as a generic type alias:: Optimized = Annotated[T, runtime.Optimize()] Optimized[int] == Annotated[int, runtime.Optimize()] OptimizedList = Annotated[List[T], runtime.Optimize()] OptimizedList[int] == Annotated[List[int], runtime.Optimize()] NrHrIrJrKr r r r r+i)r )_BaseGenericAlias) GenericAliascCs>t|trtSt|tjttttfr|j S|tj urtj SdS)a6Get the unsubscripted version of a type. This supports generic types, Callable, Tuple, Union, Literal, Final, ClassVar and Annotated. Return None for unsupported types. Examples:: get_origin(Literal[42]) is Literal get_origin(int) is None get_origin(ClassVar[int]) is ClassVar get_origin(Generic) is Generic get_origin(Generic[T]) is Generic get_origin(Union[T, int]) is Union get_origin(List[Tuple[T, T]][int]) == list get_origin(P.args) is P N) rrr+rbrdrr ParamSpecArgsParamSpecKwargsrr)rsr r r r9s   r9cCszt|tr |jf|jSt|tjtfr;t|ddrdS|j}t |t j j ur9|dt ur9t|dd|df}|SdS)aGet type arguments with all substitutions performed. For unions, basic simplifications used by Union constructor are performed. Examples:: get_args(Dict[str, int]) == (str, int) get_args(int) == () get_args(Union[int, Union[T, int], str][int]) == (int, str) get_args(Union[int, Tuple[T, int]][str]) == (int, Tuple[str, int]) get_args(Callable[[], T][int]) == ([], int) rFr rNr)rrrrrbrdrrrr9rrrEllipsisr)rsrr r r r8s  r8r5)rrec@eZdZddZdS)_TypeAliasFormcCrXrYrZr\r r r r]r^_TypeAliasForm.__repr__NrHrIrJr]r r r r r rcCt|d)&Special marker indicating that an assignment should be recognized as a proper type alias definition by type checkers. For example:: Predicate: TypeAlias = Callable[..., bool] It's invalid when used anywhere except as in the example above.  is not subscriptabler?rr r r r5s c@r)rcCrXrYrZr\r r r r]r^rNrr r r r rraSpecial marker indicating that an assignment should be recognized as a proper type alias definition by type checkers. For example:: Predicate: TypeAlias = Callable[..., bool] It's invalid when used anywhere except as in the example above.c@r)_TypeAliasMetazMetaclass for TypeAliascCdSNztyping_extensions.TypeAliasr r\r r r r]rz_TypeAliasMeta.__repr__NrHrIrJrKr]r r r r r rc@s,eZdZdZdZddZddZddZd S) _TypeAliasBaserr cCr>)Nz+TypeAlias cannot be used with isinstance().r?r@r r r rCrDz _TypeAliasBase.__instancecheck__cCr>)Nz+TypeAlias cannot be used with issubclass().r?rEr r r rF rDz _TypeAliasBase.__subclasscheck__cCrrr r\r r r r] rz_TypeAliasBase.__repr__N)rHrIrJrKrrCrFr]r r r r rs   r)rrMrc@r<) _Immutablez3Mixin to indicate that object should not be copied.r cCrrqr r\r r r __copy__rz_Immutable.__copy__cCrrqr )rAmemor r r __deepcopy__ rz_Immutable.__deepcopy__N)rHrIrJrKrrrr r r r rs  rc@ eZdZdZddZddZdS)raQThe args for a ParamSpec object. Given a ParamSpec object P, P.args is an instance of ParamSpecArgs. ParamSpecArgs objects have a reference back to their ParamSpec: P.args.__origin__ is P This type is meant for runtime introspection and has no special meaning to static type checkers. cCrprqrrArZr r r ru/r^zParamSpecArgs.__init__cC|jjdS)Nz.argsrrHr\r r r r]2zParamSpecArgs.__repr__NrHrIrJrKrur]r r r r r# c@r)ra[The kwargs for a ParamSpec object. Given a ParamSpec object P, P.kwargs is an instance of ParamSpecKwargs. ParamSpecKwargs objects have a reference back to their ParamSpec: P.kwargs.__origin__ is P This type is meant for runtime introspection and has no special meaning to static type checkers. cCrprqrrr r r ruAr^zParamSpecKwargs.__init__cCr)Nz.kwargsrr\r r r r]DrzParamSpecKwargs.__repr__Nrr r r r r5rrrcseZdZdZejZeddZeddZ ddddfd d Z d d Z d dZ ddZ ddZddZes>ddZZSZS)ra'Parameter specification variable. Usage:: P = ParamSpec('P') Parameter specification variables exist primarily for the benefit of static type checkers. They are used to forward the parameter types of one callable to another callable, a pattern commonly found in higher order functions and decorators. They are only valid when used in ``Concatenate``, or s the first argument to ``Callable``. In Python 3.10 and higher, they are also supported in user-defined Generics at runtime. See class Generic for more information on generic types. An example for annotating a decorator:: T = TypeVar('T') P = ParamSpec('P') def add_logging(f: Callable[P, T]) -> Callable[P, T]: '''A type-safe decorator to add logging to a function.''' def inner(*args: P.args, **kwargs: P.kwargs) -> T: logging.info(f'{f.__name__} was called') return f(*args, **kwargs) return inner @add_logging def add_two(x: float, y: float) -> float: '''Add two numbers together.''' return x + y Parameter specification variables defined with covariant=True or contravariant=True can be used to declare covariant or contravariant generic types. These keyword arguments are valid, but their actual semantics are yet to be decided. See PEP 612 for details. Parameter specification variables can be introspected. e.g.: P.__name__ == 'T' P.__bound__ == None P.__covariant__ == False P.__contravariant__ == False Note that only parameter specification variables defined in global scope can be pickled. cCt|Srq)rr\r r r rzParamSpec.argscCrrq)rr\r r r r rzParamSpec.kwargsNF)boundrRrTc st|g||_t||_t||_|rt|d|_nd|_z t dj dd}Wn t tfy:d}Ynw|dkrD||_dSdS)NzBound must be a type.rwrHrpZtyping_extensions)rrurHbool __covariant____contravariant__rbrc __bound__rrrr:rfrgrI)rArrrRrTdef_modrr r rus   zParamSpec.__init__cCs&|jrd}n|jr d}nd}||jS)N+-~)rrrH)rAprefixr r r r]s  zParamSpec.__repr__cCrrq)rBrr\r r r rr^zParamSpec.__hash__cCs||uSrqr rr r r rrDzParamSpec.__eq__cC|jSrq)rHr\r r r rzParamSpec.__reduce__cOrbrqr r r r r rrzParamSpec.__call__cCs||vr ||dSdSrq)appendrArEr r r _get_type_varsszParamSpec._get_type_vars)rHrIrJrKrbrrrrr rur]rrrrPEP_560rrr r rr rNs /   rcspeZdZer ejZnejZdZej Z fddZ ddZ ddZ dd Zed d Zes4d d ZZSZS)_ConcatenateGenericAliasFcst|||_||_dSrq)rrurr)rArZrrr r rus  z!_ConcatenateGenericAlias.__init__cs2tj|jddfdd|jDdS)Nrrc3s|]}|VqdSrqr rrr r rr2z4_ConcatenateGenericAlias.__repr__..r)rbrrrrr\r rr r]s z!_ConcatenateGenericAlias.__repr__cCrrq)rrrr\r r r rrz!_ConcatenateGenericAlias.__hash__cOrbrqr r r r r rrz!_ConcatenateGenericAlias.__call__cCstdd|jDS)Ncss$|] }t|tjtfr|VqdSrq)rrbrr)rrsr r r rs  z:_ConcatenateGenericAlias.__parameters__..)rrr\r r r rsz'_ConcatenateGenericAlias.__parameters__cCs&|jr|jrt|j|dSdSdSrq)rrrbrrr r r rs z'_ConcatenateGenericAlias._get_type_vars)rHrIrJrrbrdrZ _TypingBaserrrrur]rrrrrrr r rr rs  rcsZ|dkrtdt|ts|f}t|dtstddtfdd|D}t||S)Nr z&Cannot take a Concatenate of no types.rzAThe last parameter to Concatenate should be a ParamSpec variable.z/Concatenate[arg, ...]: each arg must be a type.c3rrqrrrr r rr z'_concatenate_getitem..)rrrrrrr rr _concatenate_getitems  rcC t||S)&Used in conjunction with ``ParamSpec`` and ``Callable`` to represent a higher order function which adds, removes or transforms parameters of a callable. For example:: Callable[Concatenate[int, P], int] See PEP 612 for detailed information. rrr r r rs c@rV)_ConcatenateFormcCrXrYrZr\r r r r] r^z_ConcatenateForm.__repr__cCrrqrrr r r rg r^z_ConcatenateForm.__getitem__Nrir r r r r  rrc@r)_ConcatenateAliasMetazMetaclass for Concatenate.cCrNztyping_extensions.Concatenater r\r r r r]!rz_ConcatenateAliasMeta.__repr__Nrr r r r rrrc@s4eZdZdZdZddZddZddZd d Zd S) _ConcatenateAliasBaserr cCr>)Nz-Concatenate cannot be used with isinstance().r?r@r r r rC3rDz'_ConcatenateAliasBase.__instancecheck__cCr>)Nz-Concatenate cannot be used with issubclass().r?rEr r r rF6rDz'_ConcatenateAliasBase.__subclasscheck__cCrrr r\r r r r]9rz_ConcatenateAliasBase.__repr__cCrrqrrr r r rg<r^z!_ConcatenateAliasBase.__getitem__N) rHrIrJrKrrCrFr]rgr r r r r$s  rr6c@r)_TypeGuardFormcCrXrYrZr\r r r r]Gr^_TypeGuardForm.__repr__Nrr r r r rFrrcCs t||d}t||fS) Special typing form used to annotate the return type of a user-defined type guard function. ``TypeGuard`` only accepts a single type argument. At runtime, functions marked this way should return a boolean. ``TypeGuard`` aims to benefit *type narrowing* -- a technique used by static type checkers to determine a more precise type of an expression within a program's code flow. Usually type narrowing is done by analyzing conditional code flow and applying the narrowing to a block of code. The conditional expression here is sometimes referred to as a "type guard". Sometimes it would be convenient to use a user-defined boolean function as a type guard. Such a function should use ``TypeGuard[...]`` as its return type to alert static type checkers to this intention. Using ``-> TypeGuard`` tells the static type checker that for a given function: 1. The return value is a boolean. 2. If the return value is ``True``, the type of its argument is the type inside ``TypeGuard``. For example:: def is_str(val: Union[str, float]): # "isinstance" type guard if isinstance(val, str): # Type of ``val`` is narrowed to ``str`` ... else: # Else, type of ``val`` is narrowed to ``float``. ... Strict type narrowing is not enforced -- ``TypeB`` need not be a narrower form of ``TypeA`` (it can even be a wider form) and this may lead to type-unsafe results. The main reason is to allow for things like narrowing ``List[object]`` to ``List[str]`` even though the latter is not a subtype of the former, since ``List`` is invariant. The responsibility of writing type-safe type guards is left to the user. ``TypeGuard`` also works with type variables. For more information, see PEP 647 (User-Defined Type Guards). rx)rbrcrdrer r r r6Js,c@rV)rcCrXrYrZr\r r r r]|r^rcCr_)Nz accepts only a single typerarer r r rgrhz_TypeGuardForm.__getitem__Nrir r r r rzrjrcrl) _TypeGuardrrnNcKrprqrnrrr r r rur^z_TypeGuard.__init__cCrv)Nrwz accepts only a single type.TrLryrzr|r r r rgr}z_TypeGuard.__getitem__cCr~rrrr r r rrz_TypeGuard._eval_typecrrrrrr r r]rz_TypeGuard.__repr__cCrrqrr\r r r rrz_TypeGuard.__hash__cCrrq)rrrrorr r r rrz_TypeGuard.__eq__rqrr r rr rs+  rrc@sneZdZdZddZddZddZdd Zd d Zd d Z ddZ ddZ ddZ ddZ ejddZdS) _SpecialForm)r[rK_getitemcCs||_|j|_|j|_dSrq)rrHr[rK)rArr r r ru s z_SpecialForm.__init__cCs|dvr|jSt|)N>rHrJ)r[rf)rArfr r r rsz_SpecialForm.__getattr__cCtd|)Nrr?)rArXr r r __mro_entries__rz_SpecialForm.__mro_entries__cCs d|jSrYrZr\r r r r]rz_SpecialForm.__repr__cCrrqrZr\r r r rrz_SpecialForm.__reduce__cOr)NzCannot instantiate r?)rArrtr r r rrz_SpecialForm.__call__cCstj||fSrqrbUnionrr r r __or__!rz_SpecialForm.__or__cCstj||fSrqrrr r r __ror__$rz_SpecialForm.__ror__cCr)Nz! cannot be used with isinstance()r?r@r r r rC'rz_SpecialForm.__instancecheck__cCr)Nz! cannot be used with issubclass()r?rEr r r rF*rz_SpecialForm.__subclasscheck__cCs |||Srq)rrr r r rg-rz_SpecialForm.__getitem__N)rHrIrJrrurrr]rrrrrCrFrbrLrgr r r r rsrcCr)Used to spell the type of "self" in classes. Example:: from typing import Self class ReturnsSelf: def parse(self, data: bytes) -> Self: ... return self rr?)rAr$r r r r1sc@r<)_Selfrr cCr)Nz" cannot be used with isinstance().r?r@r r r rCRrz_Self.__instancecheck__cCr)Nz" cannot be used with issubclass().r?rEr r r rFUrz_Self.__subclasscheck__NrGr r r r rBs   rRequiredc@r)_ExtensionsSpecialFormcCrXrYrZr\r r r r]`r^z_ExtensionsSpecialForm.__repr__Nrr r r r r_rrcCr_)A special typing construct to mark a key of a total=False TypedDict as required. For example: class Movie(TypedDict, total=False): title: Required[str] year: int m = Movie( title='The Matrix', # typechecker error if key is omitted year=1999, ) There is no runtime checking that a required key is actually provided when instantiating a related TypedDict. r`rarer r r rcscCr_)`A special typing construct to mark a key of a TypedDict as potentially missing. For example: class Movie(TypedDict): title: str year: NotRequired[int] m = Movie( title='The Matrix', # typechecker error if key is omitted year=1999, ) r`rarer r r NotRequiredwsrc@rV) _RequiredFormcCrXrYrZr\r r r r]r^z_RequiredForm.__repr__cCs"t|d|j}t||fS)Nz{} accepts only single type)rbrcformatr[rdrer r r rgrhz_RequiredForm.__getitem__Nrir r r r rrrrrcsJeZdZdZdddZddZddZfd d Zd d Zd dZ Z S)_MaybeRequiredrnNcKrprqrnrrr r r rur^z_MaybeRequired.__init__c CsNt|}|jdur|t|d|jddddStd|jdd)Nz{} accepts only single type.rwTrLz {} cannot be further subscripted)r{rorbrcrrHrr|r r r rgs z_MaybeRequired.__getitem__cCr~rrrr r r rrz_MaybeRequired._eval_typecs.t}|jdur|dt|j7}|S)Nz[{}])rr]rorrbrrrr r r]s  z_MaybeRequired.__repr__cCrrqrr\r r r rrz_MaybeRequired.__hash__cCs0t|t|s tS|jdur|j|jkS||uSrq)rr{rrorr r r rs   z_MaybeRequired.__eq__rq) rHrIrJrrurgrr]rrrr r rr rs  rc@r) _RequiredrNrr r r r rrrc@r) _NotRequiredrNrr r r r rrr)NNF)rrcollections.abcrrrb version_inforr{rrr r__all__extendrr;Z_FinalTypingBaser=rrNrOrPrQrSrrrrWrmr,r-r.rr_overload_dummyr0rrrr rrr&rMutableSequencer$r"_collections_abcrrrr'r(_aliasMutableMappingr%Dictrdr#r!r/r4r7rrCrrr1rr rSrrMrcr3r2r*r)rhrk__text_signature__rxrtrrHrIrKr+r:rrdrrrr9r8r ImportErrorrr5rr]rrrrrrrrrLrrrrrr6rrrrrrrrrrrr r r r s -       3   .    &        !B (   ,, '6 &b#           j,       . . 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