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For example: class Base: @final def done(self) -> None: ... class Sub(Base): def done(self) -> None: # Error reported by type checker ... @final class Leaf: ... class Other(Leaf): # Error reported by type checker ... There is no runtime checking of these properties. The decorator sets the ``__final__`` attribute to ``True`` on the decorated object to allow runtime introspection. T)Z __final__�AttributeErrorrC )�fr9 r9 r: r s c C s t j| �S )N)rL rV )�namer9 r9 r: r! 8 s c @ s e Zd Zdd� Zdd� ZdS )� _LiteralFormc C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp C s z_LiteralForm.__repr__c C s t j| |�S )N)rL rM )r] rI r9 r9 r: rs F s z_LiteralForm.__getitem__N)ra rb rc rp rs r9 r9 r9 r: r� A s r� ao A type that can be used to indicate to type checkers that the corresponding value has a value literally equivalent to the provided parameter. For example: var: Literal[4] = 4 The type checker understands that 'var' is literally equal to the value 4 and no other value. 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There is no runtime checking verifying that the parameter is actually a value instead of a type. � __values__Nc K s || _ d S )N)r� )r] �valuesrx r9 r9 r: ry h s z_Literal.__init__c C sJ t | �}| jd kr.t|t�s"|f}||dd�S t|jdd � � d���d S )NT)re rz z cannot be further subscripted)r{ r� rA rY rC ra )r] r� rH r9 r9 r: rs k s z_Literal.__getitem__c C s | S )Nr9 )r] r} r~ r9 r9 r: r| s s z_Literal._eval_typec s8 t � j� }| jd k r4|ddjttj| j��� d�7 }|S )Nr� z, r� )r� rp r� �join�maprL r� )r] r� )r� r9 r: rp v s z_Literal.__repr__c C s t t| �j| jf�S )N)r� r{ ra r� )r] r9 r9 r: r� | s z_Literal.__hash__c C s, t |t�stS | jd k r$| j|jkS | |kS )N)rA r� r� r� )r] r� r9 r9 r: r� s z_Literal.__eq__)r� )N) ra rb rc rd r5 ry rs r| rp r� r� r� r9 r9 )r� r: r� X s r� c s e Zd Z� fdd�Z� ZS )�_ExtensionsGenericMetac s� | j dk r*tjd�jd d kr&td��dS | js<t� j|�S | jj|�}|t k rT|S | j|j krddS x,| jj � D ] }t |t �r�qpt||�rpdS qpW dS ) a* This mimics a more modern GenericMeta.__subclasscheck__() logic (that does not have problems with recursion) to work around interactions between collections, typing, and typing_extensions on older versions of Python, see https://github.com/python/typing/issues/501. Nrz ra �abc� functoolszCParameterized generics cannot be used with class or instance checksFT)r� r� )� __origin__�sys� _getframe� f_globalsrC � __extra__r� r` �__subclasshook__r� �__mro__�__subclasses__rA r � issubclass)r] �subclass�res�scls)r� r9 r: r` � s" z(_ExtensionsGenericMeta.__subclasscheck__)ra rb rc r` r� r9 r9 )r� r: r� � s r� c @ s e Zd Zf Zdd� ZdS )r c O s, | j tkrtj||�S tjtj| f|�|�S )N)�_gorgr � collections�dequerL � _generic_new)rH �argsrx r9 r9 r: �__new__� s z Deque.__new__N)ra rb rc r5 r� r9 r9 r9 r: r � s )� metaclass�extra)�_check_methodsc @ s2 e Zd Zf Zdd� Zejdd� �Zedd� �Z dS )r c � s | S )Nr9 )r] r9 r9 r: � __aenter__� s z AsyncContextManager.__aenter__c � s d S )Nr9 )r] �exc_type� exc_value� tracebackr9 r9 r: � __aexit__� s z AsyncContextManager.__aexit__c C s | t krt|dd�S tS )Nr� r� )r �_check_methods_in_mror� )rH �Cr9 r9 r: r� � s z$AsyncContextManager.__subclasshook__N) ra rb rc r5 r� r� �abstractmethodr� � classmethodr� r9 r9 r9 r: r � s c @ s e Zd Zf Zdd� ZdS )r c O s, | j tkrtj||�S tjtj| f|�|�S )N)r� r r� rL r� )rH r� rx r9 r9 r: r� � s zOrderedDict.__new__N)ra rb rc r5 r� r9 r9 r9 r: r � s c @ s e Zd Zf Zdd� ZdS )r c O s, | j tkrtj||�S tjtj| f|�|�S )N)r� r r� rL r� )rH r� rx r9 r9 r: r� � s zCounter.__new__N)ra rb rc r5 r� r9 r9 r9 r: r � s c @ s e Zd Zf Zdd� ZdS )r c O s, | j tkrtj||�S tjtj| f|�|�S )N)r� r r� rL r� )rH r� rx r9 r9 r: r� s zChainMap.__new__N)ra rb rc r5 r� r9 r9 r9 r: r s c @ s e Zd Zf ZdS )r N)ra rb rc r5 r9 r9 r9 r: r s c C s8 t | t�st�t| d�r | jS x| jdk r2| j} q W | S )z@This function exists for compatibility with old typing versions.r� N)rA r �AssertionErrorrE r� r� )rH r9 r9 r: r� s r� �Callable�Iterable�Iterator�Hashable�Sized� Container� Collection� Reversiblec C s| t � }xp| jd d� D ]^}|jdkr&qt|di �}x@t|jj� �t|j� � D ]"}|jd� rN|d krN|j|� qNW qW |S ) Nrz r& �Generic�__annotations__�_abc_�__abstractmethods__� __weakref__� _is_protocol�_is_runtime_protocol�__dict__�__args__r5 �__next_in_mro__r< r� �__orig_bases__r� � __tree_hash__rd r� ry r� rb �_MutableMapping__markerr� ���)r& r� )r� r� r� r� r� r� r� r5 r� r< r� r� r� r� rd r� ry r� rb r� r� ) �setr� ra �getattr�listr� �keys� startswith�add)rH �attrs�base� annotations�attrr9 r9 r: �_get_protocol_attrs. s r� c s t � fdd�t� �D ��S )Nc 3 s | ]}t t� |d ��V qd S )N)�callabler� )r> r� )rH r9 r: rB B s z,_is_callable_members_only.<locals>.<genexpr>)�allr� )rH r9 )rH r: �_is_callable_members_onlyA s r� c O s t | �jrtd��d S )Nz Protocols cannot be instantiated)r{ r� rC )r] r� �kwargsr9 r9 r: �_no_initK s r� c s e Zd Z� fdd�Z� ZS )� _ProtocolMetac sX t � dd� st� �r&t�j� �r&dS � jrLt� �fdd�t� �D ��rLdS t� j��S )Nr� FTc 3 s8 | ]0}t �|�o.tt� |d �� p.t�|�d k V qd S )N)rE r� r� )r> r� )rH �instancer9 r: rB Z s z2_ProtocolMeta.__instancecheck__.<locals>.<genexpr>) r� r� r� r� r� r� r� r� r_ )rH r� )r� )rH r� r: r_ R s z _ProtocolMeta.__instancecheck__)ra rb rc r_ r� r9 r9 )r� r: r� O s r� c s> e Zd ZdZf ZdZ� fdd�Zejdd� �Z dd� Z � Z S ) r& a� Base class for protocol classes. Protocol classes are defined as:: class Proto(Protocol): def meth(self) -> int: ... Such classes are primarily used with static type checkers that recognize structural subtyping (static duck-typing), for example:: class C: def meth(self) -> int: return 0 def func(x: Proto) -> int: return x.meth() func(C()) # Passes static type check See PEP 544 for details. Protocol classes decorated with @typing_extensions.runtime act as simple-minded runtime protocol that checks only the presence of given attributes, ignoring their type signatures. Protocol classes can be generic, they are defined as:: class GenProto(Protocol[T]): def meth(self) -> T: ... Tc s | t krtd��t� j| �S )NzIType Protocol cannot be instantiated; it can only be used as a base class)r& rC r� r� )rH r� rx )r� r9 r: r� � s zProtocol.__new__c s� t |t�s|f}| r2| tjk r2td| j� d���d� t� fdd�|D ��}| tkr�tdd� |D ��s�d}x t || tj�r�|d7 }qlW td |d � d || � ���t t |��t |�kr�td ��nt | |t | j �� tj | |�S ) NzParameter list to z[...] cannot be emptyz*Parameters to generic types must be types.c 3 s | ]}t j|� �V qd S )N)rL rq )r> r? )�msgr9 r: rB � s z-Protocol.__class_getitem__.<locals>.<genexpr>c s s | ]}t |tj�V qd S )N)rA rL rV )r> r? r9 r9 r: rB � s r rz zBParameters to Protocol[...] must all be type variables. Parameter z is z.Parameters to Protocol[...] must all be unique)rA rY rL �TuplerC rc r& r� rV rF r� rJ r< rM )rH �params�ir9 )r� r: �__class_getitem__� s& zProtocol.__class_getitem__c s� g }d� j kr tj� jk}n tj� jk}|r4td��d� j k�rtj� j�}d }xH� jD ]>}t|tj�rX|j tjt fkrX|j j }|d k r�td��|j }qXW |d kr�|}nft |�}t |��|�k�s dj�fdd�|D ��} djdd� |D ��} td| � d |� d | � d ���|}t|�� _ � j jd d ��s>td d� � jD ��� _� fdd�} d� j k�r\| � _� j�shd S x^� jD ]T}|ttjfk�p�|jdk�r�|j tk�p�t|t��o�|j�sptdt|�� ����qpW t� _d S )Nr� z!Cannot inherit from plain GenericzECannot inherit from Generic[...] and/or Protocol[...] multiple types.z, c 3 s | ]}|� krt |�V qd S )N)�str)r> rQ )�gvarsetr9 r: rB � s z-Protocol.__init_subclass__.<locals>.<genexpr>c s s | ]}t |�V qd S )N)r� )r> �gr9 r9 r: rB � s zSome type variables (z) are not listed in r� r� r� c s s | ]}|t kV qd S )N)r& )r> �br9 r9 r: rB � s c s� � j jdd �stS t� dd�s>tjd�jd d kr6tS td��t� �sftjd�jd dkr^tS td ��t | t �sxtd ��xtt � �D ]h}xb| j D ]T}||j kr�|j | d kr�tS P t|d i �}t |t j�r�||kr�t | t�r�| jr�P q�W tS q�W d S )Nr� r� Frm ra r� r� zBInstance and class checks can only be used with @runtime protocolsz<Protocols with non-method members don't support issubclass()z"issubclass() arg 1 must be a classr� T)r� r� )r� r� )r� �getr� r� r� r� r� rC r� rA r{ r� r� rL �Mappingr� r� )r� r� r� r� )rH r9 r: � _proto_hook� s4 z/Protocol.__init_subclass__.<locals>._proto_hookr� zcollections.abcz5Protocols can only inherit from other protocols, got )r� rL r� r� � __bases__rC r[ rA rM r� r& ra r< r� r� rY r� �anyr� r� �objectrb �_PROTO_WHITELISTr� �reprr� ry ) rH r� r� rU �error�gvarsr� Zthe_base�tvarset�s_vars�s_argsr� r9 )rH r� r: �__init_subclass__� sR zProtocol.__init_subclass__) ra rb rc rd r5 r� r� rL � _tp_cacher� r� r� r9 r9 )r� r: r& a s )r� )� _next_in_mrorq c O s t | �jrtd��d S )Nz Protocols cannot be instantiated)r{ r� rC )r] r� r� r9 r9 r: r� s c sT e Zd ZdZd � fdd� Z� fdd�Z� fdd�Z� fd d �Zej d d � �Z � Z S )r� z�Internal metaclass for Protocol. This exists so Protocol classes can be generic without deriving from Generic. Nc sh |d ks t �|d k r<|d k s t �tdd� |D ��s:t |��n�t|�}d } xN|D ]F} | tjkrdtd��t| t�rN| jtjt fkrN| d k r�td��| j } qNW | d kr�|} n�t |�} t | �� | � k�s$dj � fdd�|D ��} dj dd� | D ��} t dd� |D ���rd nd }td | � d |� d | � d���| }|}|d k �rZt|�tjk�rZ||k�rZ|f| }tdd� |D ��}t dd� |D ���r�tdd� |D ��}|j||d�� tt| �j| |||dd�}tt|�jd|�s�|nt|�� ||_ |�r�tdd� |D ��nd |_t|�|_|d k�r ||_n|d k �r6|j|_|j |_ t |d��rd|�rTt |j � �n tt|�j � |_!|S )Nc s s | ]}t |tj�V qd S )N)rA rL rV )r> rQ r9 r9 r: rB s z(_ProtocolMeta.__new__.<locals>.<genexpr>z!Cannot inherit from plain GenericzACannot inherit from Generic[...] or Protocol[...] multiple times.z, c 3 s | ]}|� krt |�V qd S )N)r� )r> rQ )r� r9 r: rB ( s c s s | ]}t |�V qd S )N)r� )r> r� r9 r9 r: rB ) s c s s | ]}|j tjkV qd S )N)r� rL r� )r> r� r9 r9 r: rB * s r� r& zSome type variables (z) are not listed in r� r� c s s$ | ] }t |t�rt|�n|V qd S )N)rA r r� )r> r� r9 r9 r: rB 4 s c s s" | ]}t |t�o|tjk V qd S )N)rA r rL r� )r> r� r9 r9 r: rB 6 s c s s | ]}|t jk r|V qd S )N)rL r� )r> r� r9 r9 r: rB 7 s )r� r� T)re r� c s s. | ]&}|t jkrd n|t jkr"f n|V qdS ).N)rL Z_TypingEllipsisZ _TypingEmpty)r> �ar9 r9 r: rB ? s � _subs_tree)"r� r� r rL r� rC rA r r� r& r< r� r� r� r{ r� �ABCMetarY �updater� r� � __setattr__r� r� r� r� r� � _abc_registry� _abc_cacherE r� r� r� r� )rH r� �bases� namespacerU r� �originr� � orig_basesr� r� r� r� r� Zcls_nameZ initial_basesr] )r� )r� r: r� sh z_ProtocolMeta.__new__c s� t � j||� � jjdd �s2tdd� � jD ��� _� jr�xr� jdd � D ]`}|tt j fkp�|j dkrn|j t kp�t|t j�r�|jp�t|t�o�|jt j ksHtdt|�� ���qHW t� _� fdd�}d � jkr�|� _d S ) Nr� c s s* | ]"}|t kp t|t�o |jt kV qd S )N)r& rA r� r� )r> r� r9 r9 r: rB P s z)_ProtocolMeta.__init__.<locals>.<genexpr>rz zcollections.abcz5Protocols can only inherit from other protocols, got c s� � j jdd �stS t| t�s$td��xtt� �D ]h}xb| jD ]T}||j kr\|j | d krZtS P t|di �}t|t j �r:||kr:t| t �r:| j r:P q:W tS q.W dS )Nr� z"issubclass() arg 1 must be a classr� T) r� r� r� rA r{ rC r� r� r� rL r� r� r� )r� r� r� r� )rH r9 r: r� a s$ z+_ProtocolMeta.__init__.<locals>._proto_hookr� )r� ry r� r� r� r� r� r� r� rL r� rb ra r� rA � TypingMetar r� rC r� r� r� )rH r� r� r� r� )r� )rH r: ry M s" z_ProtocolMeta.__init__c s\ t �dd� st��r&t� j��r&dS �jrLt� �fdd�t��D ��rLdS tt��j � �S )Nr� FTc 3 s8 | ]0}t � |�o.tt�|d �� p.t� |�d k V qd S )N)rE r� r� )r> r� )r� r] r9 r: rB � s z2_ProtocolMeta.__instancecheck__.<locals>.<genexpr>) r� r� r� r� r� r� r� r� r r_ )r] r� )r� )r� r] r: r_ y s z _ProtocolMeta.__instancecheck__c s� | j d k r*tjd�jd d kr&td��dS | jjdd �rh| jjdd � rhtjd�jd d kr`dS td ��| jjdd �r�t| � r�tjd�jd dkr�tt | �j |�S td ��tt | �j |�S )Nrz ra r� r� zCParameterized generics cannot be used with class or instance checksFr� r� rL zBInstance and class checks can only be used with @runtime protocolsz<Protocols with non-method members don't support issubclass())r� r� )r� r� rL )r� r� rL ) r� r� r� r� rC r� r� r� r� r r` )r] rH )r� r9 r: r` � s& z _ProtocolMeta.__subclasscheck__c sX t |t�s|f}| r6t| �tjk r6td| j� d���d� t� fdd�|D ��}| tjtfkr�t dd� |D ��s�tdt | �� d���t t |��t |�kr�tdt | �� d ���|}|}n`| tjtj fkr�t|�}|}nB| jtjtfkr�td t | �� ���n t| |t | j�� t|�}|}| jd k�r(| fnf }| j| j|| j t| j�||| | j| jd �S ) NzParameter list to z[...] cannot be emptyz*Parameters to generic types must be types.c 3 s | ]}t |� �V qd S )N)rq )r> r? )r� r9 r: rB � s z,_ProtocolMeta.__getitem__.<locals>.<genexpr>c s s | ]}t |tj�V qd S )N)rA rL rV )r> r? r9 r9 r: rB � s zParameters to z [...] must all be type variablesz[...] must all be uniquez%Cannot subscript already-subscripted )rU r� r r� r )rA rY r� rL r� rC rc r� r& r� r� rF r� r� r r� rJ r< r� ra r� r; r� r� r� )r] r� rU r� �prependr9 )r� r: rs � sB z_ProtocolMeta.__getitem__)NNNNN) ra rb rc rd r� ry r_ r` rL r� rs r� r9 r9 )r� r: r� s ? , c @ s e Zd ZdZf ZdZdd� ZdS )r& a� Base class for protocol classes. Protocol classes are defined as:: class Proto(Protocol): def meth(self) -> int: ... Such classes are primarily used with static type checkers that recognize structural subtyping (static duck-typing), for example:: class C: def meth(self) -> int: return 0 def func(x: Proto) -> int: return x.meth() func(C()) # Passes static type check See PEP 544 for details. Protocol classes decorated with @typing_extensions.runtime act as simple-minded runtime protocol that checks only the presence of given attributes, ignoring their type signatures. Protocol classes can be generic, they are defined as:: class GenProto(Protocol[T]): def meth(self) -> T: ... 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This allows a simple-minded structural check very similar to the one-offs in collections.abc such as Hashable. z@@runtime_checkable can be only applied to protocol classes, got T)rA r� r� rC r� )rH r9 r9 r: r) � s c @ s$ e Zd Zf Zejed�dd��ZdS )r )�returnc C s d S )Nr9 )r] r9 r9 r: � __index__ s zSupportsIndex.__index__N)ra rb rc r5 r� r� �intr r9 r9 r9 r: r s c C s> y t jd�jd dkr td��W n ttfk r8 Y nX dS ) Nrz ra r� r� rL z4TypedDict does not support instance and class checksF)r� r� rL )r� r� r� rC r� � ValueError)rH r� r9 r9 r: � _check_fails s r c O s, | s t d��| d | dd � }} t| |�S )Nz)TypedDict.__new__(): not enough argumentsr rz )rC r6 )r� r� �_r9 r9 r: � _dict_new+ s r z,($cls, _typename, _fields=None, /, **kwargs))�totalc O s^ |s t d��|d |dd � }}|r>|d |dd � }}n4d|krj|jd�}dd l}|jdtdd� nt d��|r�y |\}W q� tk r� t d t|�d � d ���Y q�X n<d |kr�t|�dkr�|jd �}dd l}|jd tdd� nd }|d k� r�|}n|�r t d ��dt|�i}y tj d�j j dd�|d< W n t tfk �rL Y nX t |f || d�S )Nz)TypedDict.__new__(): not enough argumentsr rz Z _typenamez5Passing '_typename' as keyword argument is deprecatedrm )� stacklevelzGTypedDict.__new__() missing 1 required positional argument: '_typename'z?TypedDict.__new__() takes from 2 to 3 positional arguments but z were given�_fieldsz3Passing '_fields' as keyword argument is deprecatedz@TypedDict takes either a dict or keyword arguments, but not bothr� ra �__main__rb )r )rC r7 �warnings�warn�DeprecationWarningr rF r6 r� r� r� r� r� �_TypedDictMeta)r r� r� r �typenamer �fields�nsr9 r9 r: �_typeddict_new3 s@ r z;($cls, _typename, _fields=None, /, *, total=True, **kwargs)c s4 e Zd Zd� fdd� Zd� fdd� Ze ZZ� ZS )r Tc s t � j|||� d S )N)r� ry )rH r� r r r )r� r9 r: ry c s z_TypedDictMeta.__init__c s� |dkr t nt|d< t� j| |tf|�}i }|jdi �}d� � fdd�|j� D �}t� }t� } xH|D ]@} |j| j jdi �� |j| j jdf �� | j| j jdf �� qdW |j|� t �rDx�|j� D ]|\} } t | �} | t kr�t | �}|r�|d } t | �} | tk�r |j| � q�| tk�r"| j| � q�|�r4|j| � q�| j| � q�W n(t|j� �}|�rb|j|� n | j|� ||_t|�|_t| �|_t|d ��s�||_|S ) Nr r� r� z?TypedDict('Name', {f0: t0, f1: t1, ...}); each t must be a typec s i | ]\}}t j|� �|�qS r9 )rL rq )r> �nrw )r� r9 r: � <dictcomp>s s z*_TypedDictMeta.__new__.<locals>.<dictcomp>�__required_keys__�__optional_keys__r � __total__)r r r� r� r6 r� �itemsr� r� r� �PEP_560r3 r r2 r0 r� r1 r� r� � frozensetr r rE r )rH r� r r r Ztp_dictr� Zown_annotationsZ required_keysZ optional_keysr� Zannotation_keyZannotation_typeZannotation_originZannotation_argsZown_annotation_keys)r� )r� r: r� f sN z_TypedDictMeta.__new__)T)T) ra rb rc ry r� r r_ r` r� r9 r9 )r� r: r b s 8r a� A simple typed name space. 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+ c C s t | tt��S )a Check if an annotation is a TypedDict class For example:: class Film(TypedDict): title: str year: int is_typeddict(Film) # => True is_typeddict(Union[list, str]) # => False )rA rY �_TYPEDDICT_TYPES)rw r9 r9 r: r" � s c C s t | t�rt| j�S t| d�r:| jttfkr:t| jd �S t | tj �rrt dd� | jD ��}|| jkrh| S | j |�S tt d�r�t | t j �r�t dd� | jD ��}|| jkr�| S t j | j|�S tt d�r�t | t j�r�t dd� | jD ��}|| jkr�| S tjtj|�S | S ) z=Strips Annotated, Required and NotRequired from a given type.r� r c s s | ]}t |�V qd S )N)� _strip_extras)r> r� r9 r9 r: rB � s z _strip_extras.<locals>.<genexpr>rO c s s | ]}t |�V qd S )N)r" )r> r� r9 r9 r: rB � s rP c s s | ]}t |�V qd S )N)r" )r> r� r9 r9 r: rB � s )rA �_AnnotatedAliasr" r� rE r0 r1 r� rL rM rY � copy_withrZ rO rP r� �reduce�operator�or_)rQ Z stripped_argsr9 r9 r: r" � s( r" Fc C sH t td�r tj| ||dd�}ntj| ||d�}|r6|S dd� |j� D �S )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, ...]', 'Required[T]' or 'NotRequired[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. r T)r} r~ �include_extras)r} r~ c S s i | ]\}}t |�|�qS r9 )r" )r> �krQ r9 r9 r: r s z"get_type_hints.<locals>.<dictcomp>)rE rL r4 r )r^ r} r~ r( Zhintr9 r9 r: r4 � s c sH e Zd ZdZ� fdd�Zdd� Zdd� Zdd � Zd d � Zd d � Z � Z S )r# aK Runtime representation of an annotated type. At its core 'Annotated[t, dec1, dec2, ...]' is an alias for the type 't' with extra annotations. The alias behaves like a normal typing alias, instantiating is the same as instantiating the underlying type, binding it to types is also the same. c s2 t |t�r|j| }|j}t� j||� || _d S )N)rA r# � __metadata__r� r� ry )r] r �metadata)r� r9 r: ry , s z_AnnotatedAlias.__init__c C s$ t |�dkst�|d }t|| j�S )Nrz r )rF r� r# r* )r] r� Znew_typer9 r9 r: r$ 3 s z_AnnotatedAlias.copy_withc C s, dt j| j�� ddjdd� | jD ��� d�S )Nz typing_extensions.Annotated[z, c s s | ]}t |�V qd S )N)r� )r> r� r9 r9 r: rB 9 s z+_AnnotatedAlias.__repr__.<locals>.<genexpr>r� )rL r� r� r� r* )r] r9 r9 r: rp 8 s z_AnnotatedAlias.__repr__c C s t jt| jf| j ffS )N)r& �getitemr r� r* )r] r9 r9 r: � __reduce__< s z_AnnotatedAlias.__reduce__c C s* t |t�stS | j|jkr dS | j|jkS )NF)rA r# r� r� r* )r] r� r9 r9 r: r� A s z_AnnotatedAlias.__eq__c C s t | j| jf�S )N)r� r� r* )r] r9 r9 r: r� H s z_AnnotatedAlias.__hash__) ra rb rc rd ry r$ rp r- r� r� r� r9 r9 )r� r: r# $ s r# c @ s2 e Zd ZdZf Zdd� Zejdd� �Zdd� Z dS ) r a� Add 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 (and will be in the __origin__ field), the remaining arguments are kept as a tuple in the __extra__ 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()] c O s t d��d S )Nz&Type Annotated cannot be instantiated.)rC )rH r� r� r9 r9 r: r� n s zAnnotated.__new__c C sp t |t� st|�dk r td��ttf}t|d �|krB|d }nd}tj|d |�}t|dd � �}t ||�S )Nrm zUAnnotated[...] should be used with at least two arguments (a type and an annotation).r z$Annotated[t, ...]: t must be a type.rz ) rA rY rF rC r r r3 rL rq r# )rH r� Zallowed_special_formsr r� r+ r9 r9 r: r� q s zAnnotated.__class_getitem__c O s t d| j� d���d S )NzCannot subclass z .Annotated)rC rb )rH r� r� r9 r9 r: r� � s zAnnotated.__init_subclass__N) ra rb rc rd r5 r� rL r� r� r� r9 r9 r9 r: r K s c C s t | �dko | jd�o | jd�S )z3Returns True if name is a __dunder_variable_name__.� �__)rF r� �endswith)r� r9 r9 r: � _is_dunder� s r1 c s� e Zd ZdZ� fdd�Zedd� �Zdd� Zd� fd d � Zd d � Z e j � fd d��Z dd� Z dd� Z� fdd�Zdd� Zdd� Z� ZS )� AnnotatedMetazMetaclass for Annotatedc s8 t dd� |D ��r"tdtt� ��t� j| |||f|�S )Nc s s | ]}|t k V qd S )N)r� )r> r� r9 r9 r: rB � s z(AnnotatedMeta.__new__.<locals>.<genexpr>zCannot subclass )r� rC r� r r� r� )rH r� r r r� )r� r9 r: r� � s zAnnotatedMeta.__new__c C s | j � d S )Nrm )r� )r] r9 r9 r: r* � s zAnnotatedMeta.__metadata__c C sX |\}}}t |t�s tj|�}n|d j|�}djdd� |D ��}|� d|� d|� d�S )Nr z, c s s | ]}t |�V qd S )N)r� )r> �argr9 r9 r: rB � s z+AnnotatedMeta._tree_repr.<locals>.<genexpr>r� r� )rA rY rL r� � _tree_reprr� )r] �treerH r r+ Ztp_reprZmetadata_reprsr9 r9 r: r4 � s zAnnotatedMeta._tree_reprNc sh | t kr t S t� j||d�}t|d t�rd|d d t krd|d d }|d d }t |||d fS |S )N)rU r� rz r rm )r r� r� rA rY )r] rU r� r� Zsub_tpZ sub_annot)r� r9 r: r� � s zAnnotatedMeta._subs_treec C sX | j dkrtd��| j� }x"t|t�r<|d tkr<|d }q W t|t�rP|d S |S dS )z6Return the class used to create instance of this type.NzCCannot get the underlying type of a non-specialized Annotated type.r rz )r� rC r� rA rY r )r] r5 r9 r9 r: � _get_cons� s zAnnotatedMeta._get_consc s� t |t�s|f}| jd k r&t� j|�S t |t� s>t|�dk rHtd��nPt |d tj�rtt |d �j dkrt|d }nd}tj |d |�}t|dd � �}| j | j | j t| j�t|f�||f| d�S )Nrm z]Annotated[...] should be instantiated with at least two arguments (a type and an annotation).r Z _ClassVarz$Annotated[t, ...]: t must be a type.rz )rU r� r )rA rY r� r� rs rF rC rL � _TypingBaser{ ra rq r� r� r; r� r )r] r� rw r� r+ )r� r9 r: rs � s& zAnnotatedMeta.__getitem__c O s6 | j � }|||�}y | |_W n tk r0 Y nX |S )N)r6 Z__orig_class__r� )r] r� r� �cons�resultr9 r9 r: �__call__� s zAnnotatedMeta.__call__c C s. | j d k r"t|� r"t| j� |�S t|��d S )N)r� r1 r� r6 r� )r] r� r9 r9 r: � __getattr__� s zAnnotatedMeta.__getattr__c sJ t |�s|jd�r"t� j||� n$| jd kr6t|��nt| j� ||� d S )Nr� )r1 r� r� r� r� r� �setattrr6 )r] r� �value)r� r9 r: r� � s zAnnotatedMeta.__setattr__c C s t d��d S )Nz+Annotated cannot be used with isinstance().)rC )r] r^ r9 r9 r: r_ � s z AnnotatedMeta.__instancecheck__c C s t d��d S )Nz+Annotated cannot be used with issubclass().)rC )r] rH r9 r9 r: r` � s z AnnotatedMeta.__subclasscheck__)NN)ra rb rc rd r� �propertyr* r4 r� r6 rL r� rs r: r; r� r_ r` r� r9 r9 )r� r: r2 � s r2 c @ s e Zd ZdZdS )r av Add 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()] N)ra rb rc rd r9 r9 r9 r: r � s )�_BaseGenericAlias)rO c C s> t | t�rtS t | tjttttf�r*| j S | tj kr:tj S dS )a6 Get 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) rA r# r rL rM rO r? � ParamSpecArgs�ParamSpecKwargsr� r� )rw r9 r9 r: r3 * s c C sz t | t�r| jf| j S t | tjtf�rvt| dd�r8f S | j}t | �t j j krr|d t k rrt|dd� �|d f}|S f S )a� Get 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) rT Fr Nrz r� r� )rA r# r� r* rL rM rO r� r� r3 r� r� r� �Ellipsisr� )rw r� r9 r9 r: r2 B s c @ s e Zd Zdd� ZdS )�_TypeAliasFormc C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp _ s z_TypeAliasForm.__repr__N)ra rb rc rp r9 r9 r9 r: rC ^ s rC c C s t | � d���dS )a& 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. z is not subscriptableN)rC )r] rI r9 r9 r: r+ b s c @ s e Zd Zdd� ZdS )rC c C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp r s z_TypeAliasForm.__repr__N)ra rb rc rp r9 r9 r9 r: rC q s a� 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.c @ s e Zd ZdZdd� ZdS )�_TypeAliasMetazMetaclass for TypeAliasc C s dS )Nztyping_extensions.TypeAliasr9 )r] r9 r9 r: rp � s z_TypeAliasMeta.__repr__N)ra rb rc rd rp r9 r9 r9 r: rD � s rD c @ s, e Zd ZdZf Zdd� Zdd� Zdd� ZdS ) �_TypeAliasBasea& 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. c C s t d��d S )Nz+TypeAlias cannot be used with isinstance().)rC )r] r^ r9 r9 r: r_ � s z _TypeAliasBase.__instancecheck__c C s t d��d S )Nz+TypeAlias cannot be used with issubclass().)rC )r] rH r9 r9 r: r` � s z _TypeAliasBase.__subclasscheck__c C s dS )Nztyping_extensions.TypeAliasr9 )r] r9 r9 r: rp � s z_TypeAliasBase.__repr__N)ra rb rc rd r5 r_ r` rp r9 r9 r9 r: rE � s rE )r� re r@ c @ s$ e Zd ZdZf Zdd� Zdd� ZdS )� _Immutablez3Mixin to indicate that object should not be copied.c C s | S )Nr9 )r] r9 r9 r: �__copy__� s z_Immutable.__copy__c C s | S )Nr9 )r] �memor9 r9 r: � __deepcopy__� s z_Immutable.__deepcopy__N)ra rb rc rd r5 rG rI r9 r9 r9 r: rF � s rF c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) r@ aQ The 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. c C s || _ d S )N)r� )r] r r9 r9 r: ry � s zParamSpecArgs.__init__c C s | j j� d�S )Nz.args)r� ra )r] r9 r9 r: rp � s zParamSpecArgs.__repr__c C s t |t�stS | j|jkS )N)rA r@ r� r� )r] r� r9 r9 r: r� � s zParamSpecArgs.__eq__N)ra rb rc rd ry rp r� r9 r9 r9 r: r@ � s c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) rA a[ 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. c C s || _ d S )N)r� )r] r r9 r9 r: ry � s zParamSpecKwargs.__init__c C s | j j� d�S )Nz.kwargs)r� ra )r] r9 r9 r: rp � s zParamSpecKwargs.__repr__c C s t |t�stS | j|jkS )N)rA rA r� r� )r] r� r9 r9 r: r� � s zParamSpecKwargs.__eq__N)ra rb rc rd ry rp r� r9 r9 r9 r: rA � s rA c s| e Zd ZdZejZedd� �Zedd� �Z dddd�� fd d � Z d d � Z d d� Z dd� Z dd� Zdd� Zestdd� Z� ZS )r a' 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. c C s t | �S )N)r@ )r] r9 r9 r: r� s zParamSpec.argsc C s t | �S )N)rA )r] r9 r9 r: r� s zParamSpec.kwargsNF)�boundrj rl c s� t � j| g� || _t|�| _t|�| _|r<tj|d�| _nd | _yt j d�j j dd�}W n t tfk rv d }Y nX |dkr�|| _d S )NzBound must be a type.rz ra r �typing_extensions)r� ry ra �bool� __covariant__�__contravariant__rL rq Z __bound__r� r� r� r� r� r rb )r] r� rJ rj rl �def_mod)r� r9 r: ry s zParamSpec.__init__c C s& | j r d}n| jrd}nd}|| j S )N�+�-�~)rM rN ra )r] �prefixr9 r9 r: rp 2 s zParamSpec.__repr__c C s t j| �S )N)r� r� )r] r9 r9 r: r� ; s zParamSpec.__hash__c C s | |kS )Nr9 )r] r� r9 r9 r: r� > s zParamSpec.__eq__c C s | j S )N)ra )r] r9 r9 r: r- A s zParamSpec.__reduce__c O s d S )Nr9 )r] r� r� r9 r9 r: r: E s zParamSpec.__call__c C s | |kr|j | � d S )N)rW )r] rU r9 r9 r: �_get_type_varsJ s zParamSpec._get_type_vars)ra rb rc rd rL rV r� r> r� r� ry rp r� r� r- r: r rT r� r9 r9 )r� r: r � s - c sh e Zd ZerejZnejZdZej Z � fdd�Z dd� Z dd� Z dd � Zed d � �Zes`d d � Z� ZS )�_ConcatenateGenericAliasFc s t � j|� || _|| _d S )N)r� ry r� r� )r] r r� )r� r9 r: ry _ s z!_ConcatenateGenericAlias.__init__c s2 t j� � | j�� ddj� fdd�| jD ��� d�S )Nr� z, c 3 s | ]}� |�V qd S )Nr9 )r> r3 )r� r9 r: rB f s z4_ConcatenateGenericAlias.__repr__.<locals>.<genexpr>r� )rL r� r� r� r� )r] r9 )r� r: rp d s z!_ConcatenateGenericAlias.__repr__c C s t | j| jf�S )N)r� r� r� )r] r9 r9 r: r� i s z!_ConcatenateGenericAlias.__hash__c O s d S )Nr9 )r] r� r� r9 r9 r: r: m s z!_ConcatenateGenericAlias.__call__c C s t dd� | jD ��S )Nc s s" | ]}t |tjtf�r|V qd S )N)rA rL rV r )r> rw r9 r9 r: rB s s z:_ConcatenateGenericAlias.__parameters__.<locals>.<genexpr>)rY r� )r] r9 r9 r: r< p s z'_ConcatenateGenericAlias.__parameters__c C s | j r| jrtj| j|� d S )N)r� r< rL rT )r] rU r9 r9 r: rT x s z'_ConcatenateGenericAlias._get_type_vars)ra rb rc r rL rM r� r7 rT r� r� ry rp r� r: r> r< rT r� r9 r9 )r� r: rU R s rU c sZ |f krt d��t|t�s |f}t|d t�s6t d��d� t� fdd�|D ��}t| |�S )Nz&Cannot take a Concatenate of no types.rz zAThe last parameter to Concatenate should be a ParamSpec variable.z/Concatenate[arg, ...]: each arg must be a type.c 3 s | ]}t j|� �V qd S )N)rL rq )r> r? )r� r9 r: rB � s z'_concatenate_getitem.<locals>.<genexpr>r� )rC rA rY r rU )r] rI r9 )r� r: �_concatenate_getitem~ s rV c C s t | |�S )a& 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. )rV )r] rI r9 r9 r: r � s c @ s e Zd Zdd� Zdd� ZdS )�_ConcatenateFormc C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp � s z_ConcatenateForm.__repr__c C s t | |�S )N)rV )r] rI r9 r9 r: rs � s z _ConcatenateForm.__getitem__N)ra rb rc rp rs r9 r9 r9 r: rW � s rW a& 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. c @ s e Zd ZdZdd� ZdS )�_ConcatenateAliasMetazMetaclass for Concatenate.c C s dS )Nz typing_extensions.Concatenater9 )r] r9 r9 r: rp � s z _ConcatenateAliasMeta.__repr__N)ra rb rc rd rp r9 r9 r9 r: rX � s rX c @ s4 e Zd ZdZf Zdd� Zdd� Zdd� Zdd � Zd S ) �_ConcatenateAliasBasea& 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. c C s t d��d S )Nz-Concatenate cannot be used with isinstance().)rC )r] r^ r9 r9 r: r_ � s z'_ConcatenateAliasBase.__instancecheck__c C s t d��d S )Nz-Concatenate cannot be used with issubclass().)rC )r] rH r9 r9 r: r` � s z'_ConcatenateAliasBase.__subclasscheck__c C s dS )Nz typing_extensions.Concatenater9 )r] r9 r9 r: rp � s z _ConcatenateAliasBase.__repr__c C s t | |�S )N)rV )r] rI r9 r9 r: rs � s z!_ConcatenateAliasBase.__getitem__N) ra rb rc rd r5 r_ r` rp rs r9 r9 r9 r: rY � s rY c @ s e Zd Zdd� ZdS )�_TypeGuardFormc C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp � s z_TypeGuardForm.__repr__N)ra rb rc rp r9 r9 r9 r: rZ � s rZ c C s t j|| � d��}t j| |f�S )a 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). z accepts only single type.)rL rq rM )r] rI rr r9 r9 r: r, � s ,c @ s e Zd Zdd� Zdd� ZdS )rZ c C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp s z_TypeGuardForm.__repr__c C s" t j|| j� d��}t j| |f�S )Nz accepts only a single type)rL rq ro rM )r] rI rr r9 r9 r: rs s z_TypeGuardForm.__getitem__N)ra rb rc rp rs r9 r9 r9 r: rZ s a 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). c sN e Zd ZdZdZddd�Zdd� Zdd � Z� fd d �Zd d � Z dd� Z � Z S )� _TypeGuarda 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). rv Nc K s || _ d S )N)rv )r] rw rx r9 r9 r: ry x s z_TypeGuard.__init__c C sR t | �}| jd kr6|tj||jdd � � d��dd�S t|jdd � � d���d S )Nrz z accepts only a single type.T)re z cannot be further subscripted)r{ rv rL rq ra rC )r] rr rH r9 r9 r: rs { s z_TypeGuard.__getitem__c C s. t j| j||�}|| jkr | S t| �|dd�S )NT)re )rL r| rv r{ )r] r} r~ r r9 r9 r: r| � s z_TypeGuard._eval_typec s0 t � j� }| jd k r,|dtj| j�� d�7 }|S )Nr� r� )r� rp rv rL r� )r] r� )r� r9 r: rp � s z_TypeGuard.__repr__c C s t t| �j| jf�S )N)r� r{ ra rv )r] r9 r9 r: r� � s z_TypeGuard.__hash__c C s, t |t�stS | jd k r$| j|jkS | |kS )N)rA r[ r� rv )r] r� r9 r9 r: r� � s z_TypeGuard.__eq__)rv )N) ra rb rc rd r5 ry rs r| rp r� r� r� r9 r9 )r� r: r[ J s * r[ c @ sn e Zd ZdZdd� Zdd� Zdd � Zd d � Zd d � Zdd� Z dd� Z dd� Z dd� Z dd� Z ejdd� �ZdS ) � _SpecialFormro rd �_getitemc C s || _ |j| _|j| _d S )N)r] ra ro rd )r] r, r9 r9 r: ry � s z_SpecialForm.__init__c C s |dkr| j S t|��d S )Nra rc > ra rc )ro r� )r] rr r9 r9 r: r; � s z_SpecialForm.__getattr__c C s t d| ����d S )NzCannot subclass )rC )r] r r9 r9 r: �__mro_entries__� s z _SpecialForm.__mro_entries__c C s d| j � �S )Nztyping_extensions.)ro )r] r9 r9 r: rp � s z_SpecialForm.__repr__c C s | j S )N)ro )r] r9 r9 r: r- � s z_SpecialForm.__reduce__c O s t d| ����d S )NzCannot instantiate )rC )r] r� rx r9 r9 r: r: � s z_SpecialForm.__call__c C s t j| |f S )N)rL �Union)r] r� r9 r9 r: �__or__� s z_SpecialForm.__or__c C s t j|| f S )N)rL r_ )r] r� r9 r9 r: �__ror__� s z_SpecialForm.__ror__c C s t | � d���d S )Nz! cannot be used with isinstance())rC )r] r^ r9 r9 r: r_ � s z _SpecialForm.__instancecheck__c C s t | � d���d S )Nz! cannot be used with issubclass())rC )r] rH r9 r9 r: r` � s z _SpecialForm.__subclasscheck__c C s | j | |�S )N)r] )r] rI r9 r9 r: rs � s z_SpecialForm.__getitem__N)ro rd r] )ra rb rc r5 ry r; r^ rp r- r: r` ra r_ r` rL r� rs r9 r9 r9 r: r\ � s r\ c C s t | � d���dS )aD Represents an arbitrary literal string. Example:: from typing_extensions import LiteralString def query(sql: LiteralString) -> ...: ... query("SELECT * FROM table") # ok query(f"SELECT * FROM {input()}") # not ok See PEP 675 for details. z is not subscriptableN)rC )r] r� r9 r9 r: r � s c @ s$ e Zd ZdZf Zdd� Zdd� ZdS )�_LiteralStringaD Represents an arbitrary literal string. Example:: from typing_extensions import LiteralString def query(sql: LiteralString) -> ...: ... query("SELECT * FROM table") # ok query(f"SELECT * FROM {input()}") # not ok See PEP 675 for details. c C s t | � d���d S )Nz" cannot be used with isinstance().)rC )r] r^ r9 r9 r: r_ � s z _LiteralString.__instancecheck__c C s t | � d���d S )Nz" cannot be used with issubclass().)rC )r] rH r9 r9 r: r` � s z _LiteralString.__subclasscheck__N)ra rb rc rd r5 r_ r` r9 r9 r9 r: rb � s rb c C s t | � d���dS )z�Used to spell the type of "self" in classes. Example:: from typing import Self class ReturnsSelf: def parse(self, data: bytes) -> Self: ... return self z is not subscriptableN)rC )r] r� r9 r9 r: r � s c @ s$ e Zd ZdZf Zdd� Zdd� ZdS )�_Selfz�Used to spell the type of "self" in classes. Example:: from typing import Self class ReturnsSelf: def parse(self, data: bytes) -> Self: ... return self c C s t | � d���d S )Nz" cannot be used with isinstance().)rC )r] r^ r9 r9 r: r_ s z_Self.__instancecheck__c C s t | � d���d S )Nz" cannot be used with issubclass().)rC )r] rH r9 r9 r: r` " s z_Self.__subclasscheck__N)ra rb rc rd r5 r_ r` r9 r9 r9 r: rc s rc c C s t | � d���dS )a� The bottom type, a type that has no members. This can be used to define a function that should never be called, or a function that never returns:: from typing_extensions import Never def never_call_me(arg: Never) -> None: pass def int_or_str(arg: int | str) -> None: never_call_me(arg) # type checker error match arg: case int(): print("It's an int") case str(): print("It's a str") case _: never_call_me(arg) # ok, arg is of type Never z is not subscriptableN)rC )r] r� r9 r9 r: r. + s c @ s$ e Zd ZdZf Zdd� Zdd� ZdS )�_Nevera� The bottom type, a type that has no members. This can be used to define a function that should never be called, or a function that never returns:: from typing_extensions import Never def never_call_me(arg: Never) -> None: pass def int_or_str(arg: int | str) -> None: never_call_me(arg) # type checker error match arg: case int(): print("It's an int") case str(): print("It's a str") case _: never_call_me(arg) # ok, arg is of type Never c C s t | � d���d S )Nz" cannot be used with isinstance().)rC )r] r^ r9 r9 r: r_ ^ s z_Never.__instancecheck__c C s t | � d���d S )Nz" cannot be used with issubclass().)rC )r] rH r9 r9 r: r` a s z_Never.__subclasscheck__N)ra rb rc rd r5 r_ r` r9 r9 r9 r: rd E s rd c @ s e Zd Zdd� ZdS )�_ExtensionsSpecialFormc C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp l s z _ExtensionsSpecialForm.__repr__N)ra rb rc rp r9 r9 r9 r: re k s re c C s" t j|| j� d��}t j| |f�S )a� 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. z accepts only single type)rL rq ro rM )r] rI rr r9 r9 r: r0 o s c C s" t j|| j� d��}t j| |f�S )a` 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, ) z accepts only single type)rL rq ro rM )r] rI rr r9 r9 r: r1 � s c @ s e Zd Zdd� Zdd� ZdS )� _RequiredFormc C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp � s z_RequiredForm.__repr__c C s" t j|dj| j��}t j| |f�S )Nz{} accepts only single type)rL rq �formatro rM )r] rI rr r9 r9 r: rs � s z_RequiredForm.__getitem__N)ra rb rc rp rs r9 r9 r9 r: rf � s rf a� 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. a` 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, ) c sJ e Zd ZdZddd�Zdd� Zdd� Z� fd d �Zd d � Zd d� Z � Z S )�_MaybeRequiredrv Nc K s || _ d S )N)rv )r] rw rx r9 r9 r: ry � s z_MaybeRequired.__init__c C sR t | �}| jd kr6|tj|dj|jdd � ��dd�S tdj|jdd � ���d S )Nz {} accepts only single type.rz T)re z {} cannot be further subscripted)r{ rv rL rq rg ra rC )r] rr rH r9 r9 r: rs � s z_MaybeRequired.__getitem__c C s. t j| j||�}|| jkr | S t| �|dd�S )NT)re )rL r| rv r{ )r] r} r~ r r9 r9 r: r| � s z_MaybeRequired._eval_typec s. t � j� }| jd k r*|djtj| j��7 }|S )Nz[{}])r� rp rv rg rL r� )r] r� )r� r9 r: rp � s z_MaybeRequired.__repr__c C s t t| �j| jf�S )N)r� r{ ra rv )r] r9 r9 r: r� � s z_MaybeRequired.__hash__c C s0 t |t| ��stS | jd k r(| j|jkS | |kS )N)rA r{ r� rv )r] r� r9 r9 r: r� � s z_MaybeRequired.__eq__)rv )N) ra rb rc r5 ry rs r| rp r� r� r� r9 r9 )r� r: rh � s rh c @ s e Zd ZdZdS )� _Requireda� 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. N)ra rb rc rd r9 r9 r9 r: ri � s ri c @ s e Zd ZdZdS )� _NotRequireda` 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, ) N)ra rb rc rd r9 r9 r9 r: rj � s rj c @ s e Zd Zdd� ZdS )�_UnpackSpecialFormc C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp s z_UnpackSpecialForm.__repr__N)ra rb rc rp r9 r9 r9 r: rk s rk c @ s e Zd ZejZdS )� _UnpackAliasN)ra rb rc rL rV r� r9 r9 r9 r: rl s rl c C s t j|| j� d��}t| |f�S )a A special typing construct to unpack a variadic type. For example: Shape = TypeVarTuple('Shape') Batch = NewType('Batch', int) def add_batch_axis( x: Array[Unpack[Shape]] ) -> Array[Batch, Unpack[Shape]]: ... z accepts only single type)rL rq ro rl )r] rI rr r9 r9 r: r s c C s t | t�S )N)rA rl )r^ r9 r9 r: r= s r= c @ s e Zd ZejZdS )rl N)ra rb rc rL rV r� r9 r9 r9 r: rl " s c @ s e Zd Zdd� Zdd� ZdS )� _UnpackFormc C s d| j S )Nztyping_extensions.)ro )r] r9 r9 r: rp & s z_UnpackForm.__repr__c C s t j|| j� d��}t| |f�S )Nz accepts only single type)rL rq ro rl )r] rI rr r9 r9 r: rs ) s z_UnpackForm.__getitem__N)ra rb rc rp rs r9 r9 r9 r: rm % s rm a A special typing construct to unpack a variadic type. For example: Shape = TypeVarTuple('Shape') Batch = NewType('Batch', int) def add_batch_axis( x: Array[Unpack[Shape]] ) -> Array[Batch, Unpack[Shape]]: ... c C s t | t�S )N)rA rl )r^ r9 r9 r: r= ; s c s\ e Zd ZdZdZejZddd�Zdd� Z dd � Z � fd d �Z d d � Z dd� Z dd� Z� ZS )�_Unpacka A special typing construct to unpack a variadic type. For example: Shape = TypeVarTuple('Shape') Batch = NewType('Batch', int) def add_batch_axis( x: Array[Unpack[Shape]] ) -> Array[Batch, Unpack[Shape]]: ... rv Nc K s || _ d S )N)rv )r] rw rx r9 r9 r: ry N s z_Unpack.__init__c C s2 t | �}| jd kr&|tj|d�dd�S td��d S )Nz Unpack accepts only single type.T)re z$Unpack cannot be further subscripted)r{ rv rL rq rC )r] rr rH r9 r9 r: rs Q s z_Unpack.__getitem__c C s. t j| j||�}|| jkr | S t| �|dd�S )NT)re )rL r| rv r{ )r] r} r~ r r9 r9 r: r| Y s z_Unpack._eval_typec s. t � j� }| jd k r*|djtj| j��7 }|S )Nz[{}])r� rp rv rg rL r� )r] r� )r� r9 r: rp _ s z_Unpack.__repr__c C s t t| �j| jf�S )N)r� r{ ra rv )r] r9 r9 r: r� e s z_Unpack.__hash__c C s, t |t�stS | jd k r$| j|jkS | |kS )N)rA rn r� rv )r] r� r9 r9 r: r� h s z_Unpack.__eq__c C s | j j|� d S )N)rv rT )r] rU r9 r9 r: rT p s z_Unpack._get_type_vars)rv )N)ra rb rc rd r5 rL rV r� ry rs r| rp r� r� rT r� r9 r9 )r� r: rn @ s rn c C s t | t�S )N)rA rn )r^ r9 r9 r: r= u s c @ sZ e Zd ZdZejZdd� Zdd� Zdd� Z dd � Z d d � Z d d � Z dd� Z esVdd� ZdS )r aQ Type variable tuple. Usage:: Ts = TypeVarTuple('Ts') In the same way that a normal type variable is a stand-in for a single type such as ``int``, a type variable *tuple* is a stand-in for a *tuple* type such as ``Tuple[int, str]``. Type variable tuples can be used in ``Generic`` declarations. Consider the following example:: class Array(Generic[*Ts]): ... The ``Ts`` type variable tuple here behaves like ``tuple[T1, T2]``, where ``T1`` and ``T2`` are type variables. To use these type variables as type parameters of ``Array``, we must *unpack* the type variable tuple using the star operator: ``*Ts``. The signature of ``Array`` then behaves as if we had simply written ``class Array(Generic[T1, T2]): ...``. In contrast to ``Generic[T1, T2]``, however, ``Generic[*Shape]`` allows us to parameterise the class with an *arbitrary* number of type parameters. Type variable tuples can be used anywhere a normal ``TypeVar`` can. This includes class definitions, as shown above, as well as function signatures and variable annotations:: class Array(Generic[*Ts]): def __init__(self, shape: Tuple[*Ts]): self._shape: Tuple[*Ts] = shape def get_shape(self) -> Tuple[*Ts]: return self._shape shape = (Height(480), Width(640)) x: Array[Height, Width] = Array(shape) y = abs(x) # Inferred type is Array[Height, Width] z = x + x # ... is Array[Height, Width] x.get_shape() # ... is tuple[Height, Width] c c s | j V d S )N)� __unpacked__)r] r9 r9 r: �__iter__� s zTypeVarTuple.__iter__c C sX || _ ytjd�jjdd�}W n ttfk r: d }Y nX |dkrJ|| _t| | _ d S )Nrz ra r rK ) ra r� r� r� r� r� r rb r ro )r] r� rO r9 r9 r: ry � s zTypeVarTuple.__init__c C s | j S )N)ra )r] r9 r9 r: rp � s zTypeVarTuple.__repr__c C s t j| �S )N)r� r� )r] r9 r9 r: r� � s zTypeVarTuple.__hash__c C s | |kS )Nr9 )r] r� r9 r9 r: r� � s zTypeVarTuple.__eq__c C s | j S )N)ra )r] r9 r9 r: r- � s zTypeVarTuple.__reduce__c O s d|krt d��d S )Nre z&Cannot subclass special typing classes)rC )r] r� rx r9 r9 r: r� � s z TypeVarTuple.__init_subclass__c C s | |kr|j | � d S )N)rW )r] rU r9 r9 r: rT � s zTypeVarTuple._get_type_varsN)ra rb rc rd rL rV r� rp ry rp r� r� r- r� r rT r9 r9 r9 r: r y s * )�__objr c C s t dt| �j��tjd� | S )a� Reveal the inferred type of a variable. When a static type checker encounters a call to ``reveal_type()``, it will emit the inferred type of the argument:: x: int = 1 reveal_type(x) Running a static type checker (e.g., ``mypy``) on this example will produce output similar to 'Revealed type is "builtins.int"'. At runtime, the function prints the runtime type of the argument and returns it unchanged. zRuntime type is )�file)�printr{ ra r� �stderr)rq r9 r9 r: r' � s )�__argr c C s t d��dS )a1 Assert to the type checker that a line of code is unreachable. Example:: def int_or_str(arg: int | str) -> None: match arg: case int(): print("It's an int") case str(): print("It's a str") case _: assert_never(arg) If a type checker finds that a call to assert_never() is reachable, it will emit an error. At runtime, this throws an exception when called. z Expected code to be unreachableN)r� )ru r9 r9 r: r � s )� eq_default� order_default�kw_only_default�field_descriptors.)rv rw rx ry r c s � ���fdd�}|S )a Decorator that marks a function, class, or metaclass as providing dataclass-like behavior. Example: from typing_extensions import dataclass_transform _T = TypeVar("_T") # Used on a decorator function @dataclass_transform() def create_model(cls: type[_T]) -> type[_T]: ... return cls @create_model class CustomerModel: id: int name: str # Used on a base class @dataclass_transform() class ModelBase: ... class CustomerModel(ModelBase): id: int name: str # Used on a metaclass @dataclass_transform() class ModelMeta(type): ... class ModelBase(metaclass=ModelMeta): ... class CustomerModel(ModelBase): id: int name: str Each of the ``CustomerModel`` classes defined in this example will now behave similarly to a dataclass created with the ``@dataclasses.dataclass`` decorator. For example, the type checker will synthesize an ``__init__`` method. The arguments to this decorator can be used to customize this behavior: - ``eq_default`` indicates whether the ``eq`` parameter is assumed to be True or False if it is omitted by the caller. - ``order_default`` indicates whether the ``order`` parameter is assumed to be True or False if it is omitted by the caller. - ``kw_only_default`` indicates whether the ``kw_only`` parameter is assumed to be True or False if it is omitted by the caller. - ``field_descriptors`` specifies a static list of supported classes or functions, that describe fields, similar to ``dataclasses.field()``. At runtime, this decorator records its arguments in the ``__dataclass_transform__`` attribute on the decorated object. See PEP 681 for details. c s � ���d�| _ | S )N)rv rw rx ry )Z__dataclass_transform__)Z cls_or_fn)rv ry rx rw r9 r: � decoratorH s z&dataclass_transform.<locals>.decoratorr9 )rv rw rx ry rz r9 )rv ry rx rw r: r s E)r r r )r rK )r rS )N)r r )r r )r r� )r r )r r r )r r rm )NNF)r rK )r rS )r r )r rS )r r )r rS )r r )r r )r r )r r )r r )r rS )r r )r rS )r r )�r� r� �collections.abcr& r� rZ rN rL � version_infor r{ r r �__all__rX r; r� rD rJ rR r[ rE r/ Z_FinalTypingBaser\ rV rf rg rh ri rk r r r\ rn ru r r! r# r� r� Z_overload_dummyr% r r� r r r r r r� �MutableSequencer r �_collections_abcr� r� r� r r Z_alias�MutableMappingr �Dictr r r r$ r* r- r� r� r� r� r& r� r� r� r� rq r) r( r r r r" r r �__text_signature__r r6 ra rb rd r! r4 r� r" r r# rM r1 r2 r3 r2 r? � ImportErrorrO r+ rC r rD rE r@ rA rF r r� rU r� rV r rW rX rY r, rZ r[ r rb r rc r. rd r0 r1 re rf rh ri rj rk rl r r= rm rn r r' r r rL r� r_ ZAnyr� r9 r9 r9 r: �<module> s� 3 . & ! B( ,> , '<h# j , / * O + % 3 V 6N
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