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* _SpecialForm and its instances (special forms):
Any, NoReturn, ClassVar, Union, Optional, Concatenate
* Classes whose instances can be type arguments in addition to types:
ForwardRef, TypeVar and ParamSpec
* The core of internal generics API: _GenericAlias and _VariadicGenericAlias, the latter is
currently only used by Tuple and Callable. All subscripted types like X[int], Union[int, str],
etc., are instances of either of these classes.
* The public counterpart of the generics API consists of two classes: Generic and Protocol.
* Public helper functions: get_type_hints, overload, cast, no_type_check,
no_type_check_decorator.
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* Wrapper submodules for re and io related types.
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type(None).
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...
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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.
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information on generic types. Generic functions work as follows:
def repeat(x: T, n: int) -> List[T]:
'''Return a list containing n references to x.'''
return [x]*n
def longest(x: A, y: A) -> A:
'''Return the longest of two strings.'''
return x if len(x) >= len(y) else y
The latter example's signature is essentially the overloading
of (str, str) -> str and (bytes, bytes) -> bytes. Also note
that if the arguments are instances of some subclass of str,
the return type is still plain str.
At runtime, isinstance(x, T) and issubclass(C, T) will raise TypeError.
Type variables defined with covariant=True or contravariant=True
can be used to declare covariant or contravariant generic types.
See PEP 484 for more details. By default generic types are invariant
in all type variables.
Type variables can be introspected. e.g.:
T.__name__ == 'T'
T.__constraints__ == ()
T.__covariant__ == False
T.__contravariant__ = False
A.__constraints__ == (str, bytes)
Note that only type variables defined in global scope can be pickled.
)r{ r" �__constraints__r r! r NF�r# r$ r% c s� || _ t� �|||� |r|d urtd��|r!t|�dkr!td��d� t� fdd�|D ��| _z t�d�j �
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__classcell__rb rb r6 rc r � s +�r c @ � e Zd ZdZdd� Zdd� ZdS )rU a< The args for a ParamSpec object.
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Z� Z S ) r ap Parameter specification variable.
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P = ParamSpec('P')
Parameter specification variables exist primarily for the benefit of static
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functions and decorators. They are only valid when used in ``Concatenate``,
or s the first argument to ``Callable``, or as parameters for user-defined
Generics. 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.
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...
# Etc.
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return default
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class Proto(Protocol):
def meth(self) -> int:
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class C:
def meth(self) -> int:
return 0
def func(x: Proto) -> int:
return x.meth()
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class GenProto(Protocol[T]):
def meth(self) -> T:
...
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W | S t yJ Y | S w )aI Decorator to indicate that annotations are not type hints.
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follow it with an implementation. The implementation should *not*
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)r� )r� rb rb rc rT � s rT c C r� )aV A decorator to indicate final methods and final classes.
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class Base:
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rb )�frb rb rc rK � s rK �T�KT�VT�T_co)r$ �V_co�VT_co�T_contra)r% �CT_co)r$ r# rI r� a� Callable type; Callable[[int], str] is a function of (int) -> str.
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r r r r rL a@ Tuple type; Tuple[X, Y] is the cross-product type of X and Y.
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r= r: r? r@ r r/ r; r< r a� A special construct usable to annotate class objects.
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U = TypeVar('U', bound=User)
def new_user(user_class: Type[U]) -> U:
user = user_class()
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dict that maps field names to types. (The field names are also in
the _fields attribute, which is part of the namedtuple API.)
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Employee = NamedTuple('Employee', name=str, id=int)
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NzIEither list of fields or keywords can be provided to NamedTuple, not bothr� r{ r0 r\ ) r� rj r r3 r4 r r� r r )r r rD r] rb rb rc rA � s
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zHcannot inherit from both a TypedDict type and a non-TypedDict base classr� z?TypedDict('Name', {f0: t0, f1: t1, ...}); each t must be a typec s" i | ]
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aS A simple typed namespace. At runtime it is equivalent to a plain dict.
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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})
By default, all keys must be present in a TypedDict. It is possible
to override this by specifying totality.
Usage::
class point2D(TypedDict, total=False):
x: int
y: int
This means that a point2D TypedDict can have any of the keys omitted.A type
checker is only expected to support a literal False or True as the value of
the total argument. True is the default, and makes all items defined in the
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Nz@TypedDict takes either a dict or keyword arguments, but not bothr� r� r{ r0 rx rb r# ) rj rr r r3 r4 r r� r r� )r r r" rD r rb rb rc rB @ s * �rB c C s t fS r� )�
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UserId = NewType('UserId', int)
def name_by_id(user_id: UserId) -> str:
...
UserId('user') # Fails type check
name_by_id(42) # Fails type check
name_by_id(UserId(42)) # OK
num = UserId(5) + 1 # type: int
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This is an abstract, generic version of the return of open().
NOTE: This does not distinguish between the different possible
classes (text vs. binary, read vs. write vs. read/write,
append-only, unbuffered). The TextIO and BinaryIO subclasses
below capture the distinctions between text vs. binary, which is
pervasive in the interface; however we currently do not offer a
way to track the other distinctions in the type system.
rb r� c C r� r� rb r� rb rb rc �mode� � zIO.modec C r� r� rb r� rb rb rc r � r( zIO.nameNc C r� r� rb r� rb rb rc �close� r� zIO.closec C r� r� rb r� rb rb rc �closed� r( z IO.closedc C r� r� rb r� rb rb rc �fileno� r� z IO.filenoc C r� r� rb r� rb rb rc �flush� r� zIO.flushc C r� r� rb r� rb rb rc �isatty� r� z IO.isattyr r c C r� r� rb )r� r rb rb rc �read� r� zIO.readc C r� r� rb r� rb rb rc �readable� r� z IO.readable�limitc C r� r� rb )r� r0 rb rb rc �readline� r� z IO.readline�hintc C r� r� rb )r� r2 rb rb rc � readlines� r� z IO.readlinesr �offset�whencec C r� r� rb )r� r4 r5 rb rb rc �seek� r� zIO.seekc C r� r� rb r� rb rb rc �seekable� r� z IO.seekablec C r� r� rb r� rb rb rc �tell� r� zIO.tell�sizec C r� r� rb )r� r9 rb rb rc �truncate� r� z IO.truncatec C r� r� rb r� rb rb rc �writable
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r� zIO.write�linesc C r� r� rb )r� r> rb rb rc �
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r� z IO.__enter__c C r� r� rb )r� r^ r� � tracebackrb rb rc �__exit__
r� z IO.__exit__)r� N)r r r� )r� r@ ) r{ rx ry r� r� rE r r` r' r r) r r* r� r+ r, r- rI r. r/ r1 r= r3 r6 r7 r8 r: r; r= r? rA rC rb rb rb rc rE � s\ rE c @ s@ e Zd ZdZdZedeeef de fdd��Z
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r( z
TextIO.bufferc C r� r� rb r� rb rb rc �encoding-
r( zTextIO.encodingc C r� r� rb r� rb rb rc �errors2
r( z
TextIO.errorsc C r� r� rb r� rb rb rc �line_buffering7
r( zTextIO.line_bufferingc C r� r� rb r� rb rb rc �newlines<
r( zTextIO.newlinesc C r� r� rb r� rb rb rc rA A
r� zTextIO.__enter__N)r� rH )r{ rx ry r� r� rE r rD rE r` rF r rG r rH r rI rA rb rb rb rc rH #
s( rH c @ s$ e Zd ZdZg d�ZeZeZeZdS )�ioz)Wrapper namespace for IO generic classes.)rE rH rD N)r{ rx ry r� �__all__rE rH rD rb rb rb rc rJ F
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r r r rZ r r[ r r r rU rV r rJ rK rh r� r� r� r� r� r r� rt r re rd Z_TYPING_INTERNALSZ_SPECIAL_NAMESr� r� r� r� r� r� r� r� r r� r rW rJ r� rz �BuiltinFunctionType�
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