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The typing module: Support for gradual typing as defined by PEP 484.
At large scale, the structure of the module is following:
* Imports and exports, all public names should be explicitly added to __all__.
* Internal helper functions: these should never be used in code outside this module.
* _SpecialForm and its instances (special forms): Any, NoReturn, ClassVar, Union, Optional
* Two classes whose instances can be type arguments in addition to types: ForwardRef and TypeVar
* 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
(the latter is currently private, but will be made public after PEP 544 acceptance).
* Public helper functions: get_type_hints, overload, cast, no_type_check,
no_type_check_decorator.
* Generic aliases for collections.abc ABCs and few additional protocols.
* Special types: NewType, NamedTuple, TypedDict (may be added soon).
* Wrapper submodules for re and io related types.
� N)�abstractmethod�abstractproperty)�WrapperDescriptorType�MethodWrapperType�MethodDescriptorType�Any�Callable�ClassVar�
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TYPE_CHECKINGTc C s� t tf}|r|tf }| dkr&td�S t| t�r8t| �S t| t�rZ| j|krZt | � d���t| t
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tf�r�| S t| �s�t |� d| d�d���| S )a� Check that the argument is a type, and return it (internal helper).
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into ForwardRef instances. Consider several corner cases, for example plain
special forms like Union are not valid, while Union[int, str] is OK, etc.
The msg argument is a human-readable error message, e.g::
"Union[arg, ...]: arg should be a type."
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__origin__� TypeError� _SpecialFormr rA r �callable)�arg�msg� is_argumentZinvalid_generic_forms� rR �+/opt/alt/python37/lib64/python3.7/typing.py� _type_checkq s$
rT c C sR t | t�r,| jdkr| jS | j� d| j� �S | dkr8dS t | tj�rJ| jS t| �S )a; Return the repr() of an object, special-casing types (internal helper).
If obj is a type, we return a shorter version than the default
type.__repr__, based on the module and qualified name, which is
typically enough to uniquely identify a type. For everything
else, we fall back on repr(obj).
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_collect_type_vars((T, List[S, T])) == (T, S)
c s g | ]}|� kr|�qS rR rR )�.0�t)�tvarsrR rS �
<listcomp>� s z&_collect_type_vars.<locals>.<listcomp>)rH r �appendrJ �_special�extend�__parameters__�tuple)rX r_ rR )r` rS �_collect_type_vars� s
rg c C s� t | t�s| S t| j�}x\t| j�D ]N\}}t |t�rbx:t|�D ] \}}||kr@|| ||< q@W q$t|||�||< q$W | jtkr�tt |� S | �
t |��S )zjSubstitute type variables 'tvars' with substitutions 'subs'.
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) rH rJ �list�__args__� enumerater � _subs_tvarsrK r rf � copy_with)�tpr` ZsubsZnew_args�arO �iZtvarrR rR rS rk � s
rk c C s^ | j st| � d���t|�}t| j �}||krZtd||kr>dnd� d| � d|� d|� ���dS ) z�Check correct count for parameters of a generic cls (internal helper).
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z is not a generic classzToo ZmanyZfewz parameters for z ; actual z , expected N)re rL �len)�cls�
parametersZalenZelenrR rR rS �_check_generic� s
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|� q�W |}|r�t |��t|�S )zyAn internal helper for Union creation and substitution: flatten Unions
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rz c s4 t �� ��� t�� j� t ���� �fdd��}|S )zInternal wrapper caching __getitem__ of generic types with a fallback to
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z_tp_cache.<locals>.inner)� functools� lru_cache� _cleanupsrb � cache_clear�wraps)r~ r rR )r} r~ rS � _tp_cache� s r� c sb t | t�r| �� ��S t | t�r^t� �fdd�| jD ��}|| jkrH| S | �|�}| j|_|S | S )z�Evaluate all forward reverences in the given type t.
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r� c @ s e Zd ZdZdZdd� ZdS )�_Finalz Mixin to prohibit subclassing)� __weakref__c O s d|krt d��d S )N�_rootz&Cannot subclass special typing classes)rL )�selfr{ r| rR rR rS �__init_subclass__ s z_Final.__init_subclass__N)rZ rV rW �__doc__� __slots__r� rR rR rR rS r� s r� c @ s e Zd ZdZdd� Zdd� ZdS )�
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__reduce__H s z_SpecialForm.__reduce__c O s t d| ����d S )NzCannot instantiate )rL )r� r{ r| rR rR rS �__call__K s z_SpecialForm.__call__c C s t | � d���d S )Nz! cannot be used with isinstance())rL )r� r\ rR rR rS �__instancecheck__N s z _SpecialForm.__instancecheck__c C s t | � d���d S )Nz! cannot be used with issubclass())rL )r� rq rR rR rS �__subclasscheck__Q s z _SpecialForm.__subclasscheck__c s� | j dkr t|d�}t| |f�S | j dkr�|dkr:td��t|t�sJ|f}d� t� fdd�|D ��}t|�}t|�d kr�|d
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���d S )Nr z"ClassVar accepts only single type.r rR z Cannot take a Union of no types.z)Union[arg, ...]: each arg must be a type.c 3 s | ]}t |� �V qd S )N)rT )r^ ry )rP rR rS r� _ s z+_SpecialForm.__getitem__.<locals>.<genexpr>rt r r z#Optional[t] requires a single type.z is not subscriptable)
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rM )r� a` Special type indicating an unconstrained type.
- Any is compatible with every type.
- Any assumed to have all methods.
- All values assumed to be instances of Any.
Note that all the above statements are true from the point of view of
static type checkers. At runtime, Any should not be used with instance
or class checks.
)r� a Special type indicating functions that never return.
Example::
from typing import NoReturn
def stop() -> NoReturn:
raise Exception('no way')
This type is invalid in other positions, e.g., ``List[NoReturn]``
will fail in static type checkers.
a3 Special type construct to mark class variables.
An annotation wrapped in ClassVar indicates that a given
attribute is intended to be used as a class variable and
should not be set on instances of that class. Usage::
class Starship:
stats: ClassVar[Dict[str, int]] = {} # class variable
damage: int = 10 # instance variable
ClassVar accepts only types and cannot be further subscribed.
Note that ClassVar is not a class itself, and should not
be used with isinstance() or issubclass().
a' Union type; Union[X, Y] means either X or Y.
To define a union, use e.g. Union[int, str]. Details:
- The arguments must be types and there must be at least one.
- None as an argument is a special case and is replaced by
type(None).
- Unions of unions are flattened, e.g.::
Union[Union[int, str], float] == Union[int, str, float]
- Unions of a single argument vanish, e.g.::
Union[int] == int # The constructor actually returns int
- Redundant arguments are skipped, e.g.::
Union[int, str, int] == Union[int, str]
- When comparing unions, the argument order is ignored, e.g.::
Union[int, str] == Union[str, int]
- You cannot subclass or instantiate a union.
- You can use Optional[X] as a shorthand for Union[X, None].
zEOptional type.
Optional[X] is equivalent to Union[X, None].
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rJ td|����Y nX || _|| _d| _d | _|| _ d S )Nz*Forward reference must be a string -- got z<string>�evalz/Forward reference must be an expression -- got F)
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zForwardRef.__init__c C sj | j r||k rd|d kr(|d kr(i }}n|d kr6|}n |d krB|}tt| j||�d| jd�| _d| _ | jS )Nz*Forward references must evaluate to types.)rQ T)r� rT r� r� r� r� )r� r� r� rR rR rS r� � s
zForwardRef._evaluatec C s> t |t�stS | jr2|jr2| j|jko0| j|jkS | j|jkS )N)rH r
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t | j�S )N)r� r� )r� rR rR rS r� � s zForwardRef.__hash__c C s d| j �d�S )Nz ForwardRef(�))r� )r� rR rR rS r� � s zForwardRef.__repr__N)T)
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d � ZdS ) r a� Type variable.
Usage::
T = TypeVar('T') # Can be anything
A = TypeVar('A', str, bytes) # Must be str or bytes
Type variables exist primarily for the benefit of static type
checkers. They serve as the parameters for generic types as well
as for generic function definitions. See class Generic for more
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.
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There are two kind of these aliases: user defined and special. The special ones
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have 'name' always set. If 'inst' is False, then the alias can't be instantiated,
this is used by e.g. typing.List and typing.Dict.
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z_GenericAlias.__getitem__c C s t | j|| j| jd�S )N)r� r� )rJ rK r� r� )r� rx rR rR rS rl ~ s z_GenericAlias.copy_withc C s� | j dks&t| j�dkrx| jd tkrx| j r8d| j }n
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d� | jd d� D ��� dt| jd �� d �S )Nr � r ztyping.�[z, c S s g | ] }t |��qS rR )r] )r^ rn rR rR rS ra � s z*_GenericAlias.__repr__.<locals>.<listcomp>�]� ztyping.Callableztyping.Callable[[c S s g | ] }t |��qS rR )r] )r^ rn rR rR rS ra � s ���z], )r� rp ri �Ellipsisr] rK rc �join)r� r� r{ rR rR rS r� � s
z_GenericAlias.__repr__c C sR t |t�stS | j|jkr dS | jtkrF|jtkrFt| j�t|j�kS | j|jkS )NF)rH rJ r� rK r r� ri )r� r� rR rR rS r� � s
z_GenericAlias.__eq__c C s, | j tkr ttt| j�f�S t| j | jf�S )N)rK r r� r� ri )r� rR rR rS r� � s
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z_GenericAlias.__call__c C s� | j rZg }| j|kr |�| j� |�| �}tdd� ||d d � D ��sR|�t� t|�S | jtkr�|�| �}x.||d d � D ]}t|t�r�|| k r�dS q�W | jfS )Nc s s" | ]}t |t�pt|t�V qd S )N)rH rJ �
issubclassr )r^ �brR rR rS r� � s z0_GenericAlias.__mro_entries__.<locals>.<genexpr>rt rR ) r� rK rb �index�anyr rf rH rJ )r� �basesr� ro r� rR rR rS �__mro_entries__� s
z _GenericAlias.__mro_entries__c C s* d| j kr t|�s t| j|�S t|��d S )NrK )�__dict__r� �getattrrK r� )r� r� rR rR rS � __getattr__� s z_GenericAlias.__getattr__c s2 t |�s|dkr t� �||� nt| j||� d S )N)r� r� rc )r� r� � __setattr__�setattrrK )r� r� �val)r� rR rS r� � s z_GenericAlias.__setattr__c C s | � t|��S )N)r� rG )r� r\ rR rR rS r� � s z _GenericAlias.__instancecheck__c C s< | j r0t|t�s t|| j�S |j r0t|j| j�S td��d S )NzBSubscripted generics cannot be used with class and instance checks)rc rH rJ r� rK rL )r� rq rR rR rS r� � s
z _GenericAlias.__subclasscheck__c C s� | j r | jS | jr t� | j }n| j}|tkrht| j�dkrJ| jd tksht| jd d� �| jd f}n*t | j�}t|�dkr�t
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class Mapping(Generic[KT, VT]):
def __getitem__(self, key: KT) -> VT:
...
# Etc.
This class can then be used as follows::
def lookup_name(mapping: Mapping[KT, VT], key: KT, default: VT) -> VT:
try:
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r� Y nX | S )aI Decorator to indicate that annotations are not type hints.
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@overload
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follow it with an implementation. The implementation should *not*
be decorated with @overload. For example:
@overload
def utf8(value: None) -> None: ...
@overload
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)r )r~ rR rR rS rB / s c s0 e Zd ZdZ� fdd�Zdd� Zdd� Z� ZS )�
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)r� a� A special construct usable to annotate class objects.
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class ProUser(User): ...
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User and returns an instance of the corresponding class::
U = TypeVar('U', bound=User)
def new_user(user_class: Type[U]) -> U:
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class Employee(NamedTuple):
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The resulting class has extra __annotations__ and _field_types
attributes, giving an ordered dict mapping field names to types.
__annotations__ should be preferred, while _field_types
is kept to maintain pre PEP 526 compatibility. (The field names
are in the _fields attribute, which is part of the namedtuple
API.) Alternative equivalent keyword syntax is also accepted::
Employee = NamedTuple('Employee', name=str, id=int)
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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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below capture the distinctions between text vs. binary, which is
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rR )r1 c C s d S )NrR )r� rR rR rS �mode� s zIO.modec C s d S )NrR )r� rR rR rS r� � s zIO.nameNc C s d S )NrR )r� rR rR rS �close� s zIO.closec C s d S )NrR )r� rR rR rS �closed� s z IO.closedc C s d S )NrR )r� rR rR rS �fileno� s z IO.filenoc C s d S )NrR )r� rR rR rS �flush� s zIO.flushc C s d S )NrR )r� rR rR rS �isatty� s z IO.isattyr� )r= r1 c C s d S )NrR )r� r= rR rR rS �read� s zIO.readc C s d S )NrR )r� rR rR rS �readable s z IO.readable)�limitr1 c C s d S )NrR )r� r[ rR rR rS �readline s z IO.readline)�hintr1 c C s d S )NrR )r� r] rR rR rS � readlines s z IO.readlinesr )�offset�whencer1 c C s d S )NrR )r� r_ r` rR rR rS �seek
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