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d d d d f k r e d Gd d+ d+ e et e+ e, f d e Z Gd d, d, e j et e+ e, f d e j Z Gd d) d) e j e e* ew f d e j Z e^ e d r
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d d d d f k Z d d d d d d d d d d d f Z d d d d f Z Gd d d e Z Gd d0 d0 dC e Z d d5 Z e Z d Z Gd d d eD e2 Z Gd d d e e1 Z Gd d d e e Z Gd d d Z e d e _ e e j e j evalz1Forward reference must be an expression -- got %rF) rT r^ rk rl rP compile SyntaxErrorrs rt ru rv )r[ argcode)rZ rC rD r^ s
z_ForwardRef.__init__c C s | j s | | k r | d k r; | d k r; i } } n' | d k rP | } n | d k rb | } t t | j | | d | _ d | _ | j S)Nz*Forward references must evaluate to types.T)ru _type_checkrw rt rv )r[ r_ r` rC rC rD ra s
z_ForwardRef._eval_typec C s5 t | t s t S| j | j k o4 | j | j k S)N)rk rG NotImplementedrs rv )r[ otherrC rC rD __eq__ s z_ForwardRef.__eq__c C s t | j | j f S)N)hashrs rv )r[ rC rC rD __hash__ s z_ForwardRef.__hash__c C s t d d S)Nz4Forward references cannot be used with isinstance().)rP )r[ objrC rC rD __instancecheck__ s z _ForwardRef.__instancecheck__c C s t d d S)Nz4Forward references cannot be used with issubclass().)rP )r[ rV rC rC rD __subclasscheck__ s z _ForwardRef.__subclasscheck__c C s d | j f S)Nz_ForwardRef(%r))rs )r[ rC rC rD rf s z_ForwardRef.__repr__)rs rt ru rv ) rA rd r@ rg rp r^ ra r r r r rf rC rC )rZ rD rG s rG c @ sp e Z d Z d Z d Z d d Z d d Z d
d Z d d
Z d d Z d d Z
d d Z d S)rF a: Internal helper class for defining generic variants of concrete types.
Note that this is not a type; let's call it a pseudo-type. It cannot
be used in instance and subclass checks in parameterized form, i.e.
``isinstance(42, Match[str])`` raises ``TypeError`` instead of returning
``False``.
rW type_var impl_type type_checkerc C s t | t s! t t | t | t sB t t | t | t sd t t | t | t t f s t t | | | _ | | _ | | _ | | _
d S)at Initializer.
Args:
name: The name, e.g. 'Pattern'.
type_var: The type parameter, e.g. AnyStr, or the
specific type, e.g. str.
impl_type: The implementation type.
type_checker: Function that takes an impl_type instance.
and returns a value that should be a type_var instance.
N) rk rl AssertionErrorreprrn rN rH rW r r r )r[ rW r r r rC rC rD r^ s !!"' z_TypeAlias.__init__c C s d | j t | j f S)Nz%s[%s])rW rS r )r[ rC rC rD rf , s z_TypeAlias.__repr__c C s t | j t s" t d | | j j rk t | t rk t | | j j sk t d | | j f t | t r | | j k r t d | | j | j | | j | j
S)Nz#%s cannot be further parameterized.z&%s is not a valid substitution for %s.z %s cannot be re-parameterized.) rk r r rP __constraints__rn
issubclassrZ rW r r )r[ Z parameterrC rC rD __getitem__/ s z_TypeAlias.__getitem__c C s5 t | t s t S| j | j k o4 | j | j k S)N)rk rF r} rW r )r[ r~ rC rC rD r ; s z_TypeAlias.__eq__c C s t | j | j f S)N)r rW r )r[ rC rC rD r @ s z_TypeAlias.__hash__c C s. t | j t s t d t | | j S)Nz NoReturn:
raise Exception('no way')
This type is invalid in other positions, e.g., ``List[NoReturn]``
will fail in static type checkers.
c C s t d d S)Nz*NoReturn cannot be used with isinstance().)rP )r[ r rC rC rD r s z_NoReturn.__instancecheck__c C s t d d S)Nz*NoReturn cannot be used with issubclass().)rP )r[ rV rC rC rD r s z_NoReturn.__subclasscheck__N)rA rd r@ rg rp r r rC rC rC rD r s r c sp e Z d Z d Z d Z d d d d
d d
f d d
Z d d Z d d Z d d Z d d Z S)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 do 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)
rA __bound__r
__covariant____contravariant__boundN covariantF
contravariantc s t j | | d | d | d | | | _ | rF | rF t d t | | _ t | | _ | r | d k r t d | r t | d k r t d d t f d d
| D | _
| r t | d | _ n d | _ d S) Nr r r z"Bivariant types are not supported.z-Constraints cannot be combined with bound=...rK z"A single constraint is not allowedz:TypeVar(name, constraint, ...): constraints must be types.c 3 s | ] } t | Vq d S)N)r| ).0r )r rC rD s z#TypeVar.__init__..zBound must be a type.)
rT r^ rA
ValueErrorboolr r rP rj rm r r| r )r[ rW r r r Z constraints)rZ )r rD r^ s
"zTypeVar.__init__c C s | | k r | j | d S)N)append)r[ rb rC rC rD rc s zTypeVar._get_type_varsc C s5 | j r d } n | j r$ d } n d } | | j S)N+-~)r r rA )r[ prefixrC rC rD rf
s zTypeVar.__repr__c C s t d d S)Nz0Type variables cannot be used with isinstance().)rP )r[ instancerC rC rD r s zTypeVar.__instancecheck__c C s t d d S)Nz0Type variables cannot be used with issubclass().)rP )r[ rV rC rC rD r s zTypeVar.__subclasscheck__)rA r r r r )
rA rd r@ rg rp r^ rc rf r r rC rC )rZ rD r s ( TKTVTT_cor V_coVT_coT_contrar c C s | d k r g } t | d rF t | t t f rF | j | | St | t r x. t | D] \ } } | | k rb | | Sqb W| S)zAn internal helper function: replace arg if it is a type variable
found in tvars with corresponding substitution from args or
with corresponding substitution sub-tree if arg is a generic type.
N
_subs_tree)hasattrrk r rH r r enumerate)rz rb r\ iZtvarrC rC rD _replace_arg) s $ r c C s | j d k r | S| j } g } x) | j d k rM | j | | j } q% Wg } x* | j D] } | j t | | | q^ WxJ | D]B } g } x- | j D]" } | j t | | j | q W| } q W| S)a An internal helper function: calculate substitution tree
for generic cls after replacing its type parameters with
substitutions in tvars -> args (if any).
Repeat the same following __origin__'s.
Return a list of arguments with all possible substitutions
performed. Arguments that are generic classes themselves are represented
as tuples (so that no new classes are created by this function).
For example: _subs_tree(List[Tuple[int, T]][str]) == [(Tuple, int, str)]
N)r r __args__r __parameters__) rV rb r\ ZcurrentZ
orig_chain tree_argsrz ZoclsZ
new_tree_argsrC rC rD r D s
r c s g } x | D] } t | t rD | j t k rD | j | j q
t | t r t | d k r | d t k r | j | d d q
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f d d h D r- j
q-Wt f d d | D S)zAn internal helper for Union creation and substitution: flatten Union's
among parameters, then remove duplicates and strict subclasses.
r rK Nc 3 sK | ]A } t | t o$ | j d k s t | t oB t | Vq d S)N)rk r r rn r )r Zt2)t1rC rD r s z'_remove_dups_flatten..c 3 s! | ] } | k r | Vq d S)NrC )r r )
all_paramsrC rD r s )rk r r r extendr rm rj r setremover rn any)
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new_paramsr rC )r r rD _remove_dups_flattene s0
1
r c C s~ | j s t d t | t | } t | j } | | k rz t d | | k r^ d n d t | | | f d S)Nz%s is not a generic classz0Too %s parameters for %s; actual %s, expected %sZmanyZfew)r rP r rj )rV r ZalenZelenrC rC rD _check_generic s r c sJ t j t j j t j f d d } | S)zInternal wrapper caching __getitem__ of generic types with a fallback to
original function for non-hashable arguments.
c s3 y | | SWn t k
r% Yn X | | S)N)rP )r\ r] )cachedfuncrC rD inner s
z_tp_cache..inner) functools lru_cache _cleanupsr cache_clearwraps)r r rC )r r rD _tp_cache s $r c s e Z d Z d Z d Z d d d d f d d
Z d d Z d
d Z f d d Z f d d Z e
d d Z d d d d Z d d Z
d d Z d d Z d d Z S) r a Union type; Union[X, Y] means either X or Y.
To define a union, use e.g. Union[int, str]. Details:
- The arguments must be types and there must be at least one.
- None as an argument is a special case and is replaced by
type(None).
- Unions of unions are flattened, e.g.::
Union[Union[int, str], float] == Union[int, str, float]
- Unions of a single argument vanish, e.g.::
Union[int] == int # The constructor actually returns int
- Redundant arguments are skipped, e.g.::
Union[int, str, int] == Union[int, str]
- When comparing unions, the argument order is ignored, e.g.::
Union[int, str] == Union[str, int]
- When two arguments have a subclass relationship, the least
derived argument is kept, e.g.::
class Employee: pass
class Manager(Employee): pass
Union[int, Employee, Manager] == Union[int, Employee]
Union[Manager, int, Employee] == Union[int, Employee]
Union[Employee, Manager] == Employee
- Similar for object::
Union[int, object] == object
- You cannot subclass or instantiate a union.
- You can use Optional[X] as a shorthand for Union[X, None].
r r r
__tree_hash__NrO Fc s t j | | | | d | } | d k ra d | _ d | _ d | _ t t d | _ | St | t s| t
d | t k r t | } t
| d k r | d St | | _ | | _ | | _ | j } t | t rt t | | _ n t | | _ | S)NrO r zExpected parameters=rK r )r )rT rU r r r r frozensetr rk rm rP r r rj r r )rV r originrO r\ r[ Z subs_tree)rZ rC rD rU s* ! z_Union.__new__c s | j d k r | St f d d | j D } t | j } | | j k ro | | j k ro | S| j | | d d S)Nc 3 s! | ] } t | Vq d S)N)ra )r r )r_ r` rC rD r s z$_Union._eval_type..rO T)r rm ra r rZ )r[ r_ r` ev_args ev_originrC )r_ r` rD ra s % z_Union._eval_typec C s& | j r" | j r" t | j | d S)N)r r rc )r[ rb rC rC rD rc s z_Union._get_type_varsc sR | j d k r t j S| j } t | t sA t | S| d j | S)Nr )r rT rf r rk rm r
_tree_repr)r[ tree)rZ rC rD rf s
z_Union.__repr__c s~ g } xW | d d D]E } t | t sB | j t | q | j | d j | q Wt j d d j | S)NrK r z[%s]z, )rk rm r rS r rT rf rQ )r[ r arg_listrz )rZ rC rD r
s z_Union._tree_reprc s | f k r t d t | t s0 | f } | j d k rH d n d t f d d | D } | t k r t | | | j | d | d d S) Nz Cannot take a Union of no types.z)Union[arg, ...]: each arg must be a type.z*Parameters to generic types must be types.c 3 s | ] } t | Vq d S)N)r| )r r )r rC rD r s z%_Union.__getitem__..r rO T)rP rk rm r r r rZ )r[ r rC )r rD r s
z_Union.__getitem__c C sS | t k r t St | | | } t | } t | d k rH | d St f | S)NrK r )r r r rj )r[ rb r\ r rC rC rD r % s z_Union._subs_treec C sI t | t r | j | j k S| t k r; | j | k S| | k Sd S)N)rk r r r r )r[ r~ rC rC rD r . s
z
_Union.__eq__c C s | j S)N)r )r[ rC rC rD r 6 s z_Union.__hash__c C s t d d S)Nz(Unions cannot be used with isinstance().)rP )r[ r rC rC rD r 9 s z_Union.__instancecheck__c C s t d d S)Nz(Unions cannot be used with issubclass().)rP )r[ rV rC rC rD r < s z_Union.__subclasscheck__)r r r r )rA rd r@ rg rp rU ra rc rf r r r r r r r r rC rC )rZ rD r s *
r c @ s. e Z d Z d Z f Z e d d Z d S)r zEOptional type.
Optional[X] is equivalent to Union[X, None].
c C s# t | d } t | t d f S)Nz#Optional[t] requires a single type.)r| r rn )r[ rz rC rC rD r K s z_Optional.__getitem__N)rA rd r@ rg rp r r rC rC rC rD r C s r c C s8 t | t s t x | j d k r3 | j } q W| S)z@Return the farthest origin of a generic class (internal helper).N)rk r r r )arC rC rD r T s
r c C s: t | t r t | t s$ t t | t | k S)a6 Return whether two generic classes are equivalent (internal helper).
The intention is to consider generic class X and any of its
parameterized forms (X[T], X[int], etc.) as equivalent.
However, X is not equivalent to a subclass of X.
The relation is reflexive, symmetric and transitive.
)rk r r r )r brC rC rD _geqv\ s
$r c C sf t } xY t | j d d D]> \ } } t | t r t | t k r | j | d } q W| S)zHelper for Generic.__new__.
Returns the class after the last occurrence of Generic or
Generic[...] in cls.__mro__.
NrK )objectr __mro__rk r r r
)rV Z next_in_mror crC rC rD _next_in_mrok s
&!r c s@ t j t j r* f d d } n f d d } | S)zConstruct a __subclasshook__ callable that incorporates
the associated __extra__ class in subclass checks performed
against cls.
c s{ j j | } | t k r" | S j | j k r8 d Sx< j j D]+ } t | t r` qH t | | rH d SqH Wt S)NT) __extra____subclasshook__r} r __subclasses__rk r r )subclassresscls)rV rC rD
__extrahook__ s z)_make_subclasshook..__extrahook__c s# j r t | j r d St S)NT)r r r} )r )rV rC rD r s )rk r abcABCMeta)rV r rC )rV rD _make_subclasshooky s r c C sA t | } d | k r= x" | d D] } | j | d q# W| S)zInternal helper: copy class __dict__ and clean slots class variables.
(They will be re-created if necessary by normal class machinery.)
rp N)dictpop)ZdctZ dict_copyZslotrC rC rD _no_slots_copy s
r c s9 e Z d Z d Z d d d d d f d d Z e d d Z e j d d Z e d d Z e j d
d Z d d Z d
d Z
f d d Z f d d Z d d d d Z
d d Z d d Z e d d Z f d d Z d d Z d d Z f d! d" Z S)#r ac Metaclass for generic types.
This is a metaclass for typing.Generic and generic ABCs defined in
typing module. User defined subclasses of GenericMeta can override
__new__ and invoke super().__new__. Note that GenericMeta.__new__
has strict rules on what is allowed in its bases argument:
* plain Generic is disallowed in bases;
* Generic[...] should appear in bases at most once;
* if Generic[...] is present, then it should list all type variables
that appear in other bases.
In addition, type of all generic bases is erased, e.g., C[int] is
stripped to plain C.
Nc s | d k rF | d k s t t d d | D st | nI| d k s^ t | | d k sv t | | d k s t | t | } d } xe | D]] }
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j } q W| d k r | } nr t | } t | | k st d d j
f d d | D d j
d d | D f | } | } | d k rt | t j
k r| | k r| f | } t d
d | D } t d d | D rt d d | D } | j d
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_! |
S)zCreate a new generic class. GenericMeta.__new__ accepts
keyword arguments that are used for internal bookkeeping, therefore
an override should pass unused keyword arguments to super().
Nc s s | ] } t | t Vq d S)N)rk r )r r rC rC rD r s z&GenericMeta.__new__..z!Cannot inherit from plain Genericz0Cannot inherit from Generic[...] multiple types.z6Some type variables (%s) are not listed in Generic[%s]z, c 3 s' | ] } | k r t | Vq d S)N)rl )r r )gvarsetrC rD r s c s s | ] } t | Vq d S)N)rl )r grC rC rD r s c s s0 | ]& } t | t r$ t | n | Vq d S)N)rk r r )r r rC rC rD r s c s s* | ] } t | t o! | t k Vq d S)N)rk r r
)r r rC rC rD r s c s s! | ] } | t k r | Vq d S)N)r
)r r rC rC rD r s r r rO Tc s s9 | ]/ } | t k r d n | t k r- f n | Vq d S).N)_TypingEllipsis _TypingEmpty)r r rC rC rD r s r rA r r@ )"r allr r
rP rk r r r r rQ rn r r rm r updaterT rU r r __next_in_mro____orig_bases__r r r
_abc_registry
_abc_cacher r@ r r r r )rV rW rX rY rb r\ r extra
orig_basesZgvarsbaseZtvarsetZ
initial_basesr[ )rZ )r rD rU sl (
#-
! ( zGenericMeta.__new__c C s, t | j t j r | j j St | j S)N)rk r r r _abc_negative_cacher _abc_generic_negative_cache)r[ rC rC rD r s
z GenericMeta._abc_negative_cachec C s@ | j d k r< t | j t j r3 | | j _ n | | _ d S)N)r rk r r r r r )r[ valuerC rC rD r s c C s, t | j t j r | j j St | j S)N)rk r r r _abc_negative_cache_versionr #_abc_generic_negative_cache_version)r[ rC rC rD r s
z'GenericMeta._abc_negative_cache_versionc C s@ | j d k r< t | j t j r3 | | j _ n | | _ d S)N)r rk r r r r r )r[ r rC rC rD r $ s c C s& | j r" | j r" t | j | d S)N)r r rc )r[ rb rC rC rD rc , s zGenericMeta._get_type_varsc s | j r | j j n d } | j rR t f d d | j D n d } | | j k rz | | j k rz | S| j | j | j t | j d | r t | n d d | d | d | j
d | j S)Nc 3 s! | ] } t | Vq d S)N)ra )r r )r_ r` rC rD r 3 s z)GenericMeta._eval_type..rb r\ r r r ) r ra r rm rZ rA __bases__r __dict__r r r )r[ r_ r` r r rC )r_ r` rD ra 0 s $4 zGenericMeta._eval_typec s/ | j d k r t j S| j | j S)N)r rT rf r r )r[ )rZ rC rD rf @ s
zGenericMeta.__repr__c s g } xs | d d D]a } | f k r9 | j d q t | t s^ | j t | q | j | d j | q Wt j d d j | S)NrK z()r z[%s]z, )r rk rm rS r rT rf rQ )r[ r r rz )rZ rC rD r E s zGenericMeta._tree_reprc C s< | j d k r | St | | | } t | f t | S)N)r r r rm )r[ rb r\ r rC rC rD r P s zGenericMeta._subs_treec C sK t | t s t S| j d k s1 | j d k r; | | k S| j | j k S)N)rk r r} r r )r[ r~ rC rC rD r V s
zGenericMeta.__eq__c C s | j S)N)r )r[ rC rC rD r ] s zGenericMeta.__hash__c s t | t s | f } | rG t | t k rG t d t | d t f d d | D } | t k r t d d | D s t d t t | t | k r t d | } | } n | t t
f k r t | } | } nh | t k r| } | } nM | j
t t f k rFt d t | n t | | t | } | } | j
d k r}| f n f } | j | j | | j t | j d | d
| d | d | j d
| j S)Nz)Parameter list to %s[...] cannot be emptyz*Parameters to generic types must be types.c 3 s | ] } t | Vq d S)N)r| )r r )r rC rD r h s z*GenericMeta.__getitem__..c s s | ] } t | t Vq d S)N)rk r )r r rC rC rD r k s z5Parameters to Generic[...] must all be type variablesz-Parameters to Generic[...] must all be uniquez'Cannot subscript already-subscripted %srb r\ r r r )rk rm r r rP rE r
r rj r r r r r r r rZ rA r r r r r )r[ r rb r\ ZprependrC )r rD r ` sJ
zGenericMeta.__getitem__c sg | j d k r; t j d j d d k r7 t d d S| t k rW t d | t j | S) NrK rA r r zCParameterized generics cannot be used with class or instance checksFz5Class %r cannot be used with class or instance checks)r r )r r> _getframe f_globalsrP r
rT r )r[ rV )rZ rC rD r s
z GenericMeta.__subclasscheck__c C s t | j | S)N)r rZ )r[ r rC rC rD r s z GenericMeta.__instancecheck__c C s@ | j | j | j t | j | j | j | j | j | j S)N)
rZ rA r r r r r r r r )r[ rC rC rD __copy__ s zGenericMeta.__copy__c sl | j d r | j d s- | j d rI t t | j | | n t t t | j | | d S)N___abc_)rL endswithrT r __setattr__r )r[ attrr )rZ rC rD r s zGenericMeta.__setattr__)rA rd r@ rg rU propertyr setterr rc ra rf r r r r r r r r r r rC rC )rZ rD r s$
!^ . c O sq | j d k r | j | St | } | j | } y
| | _ Wn t k
rX Yn X| j | | | Sd S)N)r rU r Z__orig_class__AttributeErrorr^ )Zbase_clsrV r\ r] r r rC rC rD _generic_new s
r
c @ s( e Z d Z d Z f Z d d Z d S)r
aC Abstract base class for generic types.
A generic type is typically declared by inheriting from
this class parameterized with one or more type variables.
For example, a generic mapping type might be defined as::
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:
return mapping[key]
except KeyError:
return default
c O s1 t | t r t d t | j | | | S)NzHType Generic cannot be instantiated; it can be used only as a base class)r r
rP r
r )rV r\ r] rC rC rD rU s zGeneric.__new__N)rA rd r@ rg rp rU rC rC rC rD r
s c @ s e Z d Z d Z d S)r zInternal placeholder for () or []. Used by TupleMeta and CallableMeta
to allow empty list/tuple in specific places, without allowing them
to sneak in where prohibited.
N)rA rd r@ rg rC rC rC rD r s r c @ s e Z d Z d Z d S)r z(Internal placeholder for ... (ellipsis).N)rA rd r@ rg rC rC rC rD r s r c sF e Z d Z d Z e f d d Z d d Z d d Z S) TupleMetaz Metaclass for Tuple (internal).c s | j d k s t | t r/ t j | S| f k rN t j t f St | t sf | f } t | d k r | d d k r d t | d } t j | t
f Sd t f d d | D } t j | S) Nr rK .z Tuple[t, ...]: t must be a type.r z*Tuple[t0, t1, ...]: each t must be a type.c 3 s | ] } t | Vq d S)N)r| )r r )r rC rD r s z(TupleMeta.__getitem__..) r r r rT r r rk rm rj r| r )r[ r r )rZ )r rD r s " zTupleMeta.__getitem__c C s, | j d k r t | t St d d S)Nz5Parameterized Tuple cannot be used with isinstance().)r rk rm rP )r[ r rC rC rD r s
zTupleMeta.__instancecheck__c C s, | j d k r t | t St d d S)Nz5Parameterized Tuple cannot be used with issubclass().)r r rm rP )r[ rV rC rC rD r
s
zTupleMeta.__subclasscheck__)rA rd r@ rg r r r r rC rC )rZ rD r s r c @ s( e Z d Z d Z f Z d d Z d S)r a@ Tuple type; Tuple[X, Y] is the cross-product type of X and Y.
Example: Tuple[T1, T2] is a tuple of two elements corresponding
to type variables T1 and T2. Tuple[int, float, str] is a tuple
of an int, a float and a string.
To specify a variable-length tuple of homogeneous type, use Tuple[T, ...].
c O s. t | t r t d t t | | | S)Nz6Type Tuple cannot be instantiated; use tuple() instead)r r rP r
rm )rV r\ r] rC rC rD rU s z
Tuple.__new__N)rA rd r@ rg rp rU rC rC rC rD r s r c sd e Z d Z d Z f d d Z f d d Z f d d Z e f d d Z S)
CallableMetaz"Metaclass for Callable (internal).c s/ | j d k r t j S| j | j S)N)r rT rf r r )r[ )rZ rC rD rf ' s
zCallableMeta.__repr__c s t | t k r" t j | Sg } xW | d d D]E } t | t sd | j t | q9 | j | d j | q9 W| d d k r t | d d | d St | d d d j | d d | d f S) NrK r z...z [..., %s]z
[[%s], %s]z, r r )
r r rT r rk rm r rS r rQ )r[ r r rz )rZ rC rD r , s
zCallableMeta._tree_reprc s | j d k s t | t r/ t j | St | t sQ t | d k r] t d | \ } } | t k r t | f } n4 t | t
s t d | f t | | f } | j | S)zxA thin wrapper around __getitem_inner__ to provide the latter
with hashable arguments to improve speed.
Nr z6Callable must be used as Callable[[arg, ...], result].z8Callable[args, result]: args must be a list. Got %.100r.) r r r rT r rk rm rj rP Ellipsislist__getitem_inner__)r[ r r\ result)rZ rC rD r < s "
zCallableMeta.__getitem__c s | \ } } d t | } | t k rC t j t | f Sd t f d d | D } | | f } t j | S)Nz.Callable[args, result]: result must be a type.z6Callable[[arg, ...], result]: each arg must be a type.c 3 s | ] } t | Vq d S)N)r| )r rz )r rC rD r X s z1CallableMeta.__getitem_inner__..)r| r rT r r rm )r[ r r\ r )rZ )r rD r P s
z CallableMeta.__getitem_inner__) rA rd r@ rg rf r r r r rC rC )rZ rD r $ s
r c @ s( e Z d Z d Z f Z d d Z d S)r a Callable type; Callable[[int], str] is a function of (int) -> str.
The subscription syntax must always be used with exactly two
values: the argument list and the return type. The argument list
must be a list of types or ellipsis; the return type must be a single type.
There is no syntax to indicate optional or keyword arguments,
such function types are rarely used as callback types.
c O s1 t | t r t d t | j | | | S)NzIType Callable cannot be instantiated; use a non-abstract subclass instead)r r rP r
r )rV r\ r] rC rC rD rU j s zCallable.__new__N)rA rd r@ rg rp rU rC rC rC rD r ] s c sm e Z d Z d Z d Z d d d Z d d Z d d Z f d
d Z d d
Z d d Z
S)r 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().
__type__Nc K s
| | _ d S)N)r )r[ tpr] rC rC rD r^ s z_ClassVar.__init__c C sp t | } | j d k rJ | t | d j | j d d d d St d j | j d d d S)Nz {} accepts only single type.rK rO Tz {} cannot be further subscripted)rn r r| formatrA rP )r[ itemrV rC rC rD r s z_ClassVar.__getitem__c C s> t | j | | } | | j k r( | St | | d d S)NrO T)ra r rn )r[ r_ r` Znew_tprC rC rD ra s z_ClassVar._eval_typec s> t j } | j d k r: | d j t | j 7} | S)Nz[{}])rT rf r r rS )r[ r)rZ rC rD rf s z_ClassVar.__repr__c C s t t | j | j f S)N)r rn rA r )r[ rC rC rD r s z_ClassVar.__hash__c C s< t | t s t S| j d k r2 | j | j k S| | k S)N)rk r r} r )r[ r~ rC rC rD r s
z_ClassVar.__eq__)r ) rA rd r@ rg rp r^ r ra rf r r rC rC )rZ rD r q s r c C s | S)zCast a value to a type.
This returns the value unchanged. To the type checker this
signals that the return value has the designated type, but at
runtime we intentionally don't check anything (we want this
to be as fast as possible).
rC )typvalrC rC rD r6 s c
C s y
| j } Wn t k
r% i SYn X| j } | j } | d | } | j pT f } | j } | rr t | n i } | t | } xC t | | d | D]( \ } } | | k s t | | | .wrapped_decorator)r r )r, r- rC )r, rD r: 1 s !c O s t d d S)z*Helper for @overload to raise when called.zYou should not call an overloaded function. A series of @overload-decorated functions outside a stub module should always be followed by an implementation that is not @overload-ed.N)NotImplementedError)r\ r] rC rC rD _overload_dummyA s r/ c C s t S)a
Decorator for overloaded functions/methods.
In a stub file, place two or more stub definitions for the same
function in a row, each decorated with @overload. For example:
@overload
def utf8(value: None) -> None: ...
@overload
def utf8(value: bytes) -> bytes: ...
@overload
def utf8(value: str) -> bytes: ...
In a non-stub file (i.e. a regular .py file), do the same but
follow it with an implementation. The implementation should *not*
be decorated with @overload. For example:
@overload
def utf8(value: None) -> None: ...
@overload
def utf8(value: bytes) -> bytes: ...
@overload
def utf8(value: str) -> bytes: ...
def utf8(value):
# implementation goes here
)r/ )r rC rC rD r; J s c s@ e Z d Z d Z f d d Z d d Z d d Z S)
_ProtocolMetaz~Internal metaclass for _Protocol.
This exists so _Protocol classes can be generic without deriving
from Generic.
c s/ t | j k r t j | St d d S)Nz+Protocols cannot be used with isinstance().)r r rT r rP )r[ r )rZ rC rD r n s z _ProtocolMeta.__instancecheck__c sd | j s
t S| t k r d S| j } x4 | D], t f d d | j D s0 d Sq0 Wd S)NTc 3 s | ] } | j k Vq d S)N)r )r d)r rC rD r s z2_ProtocolMeta.__subclasscheck__..F)rh r} r _get_protocol_attrsr r )r[ rV attrsrC )r rD r s s
"z _ProtocolMeta.__subclasscheck__c C s g } x? | j D]4 } t | d d r | j d k r | j | q Wt } x<| D]4} x+| j j D]} x| j D]5 } | | k r~ | | j k r~ t | d d r~ Pq~ W| j d rn | d k rn | d k rn | d k rn | d k rn | d k rn | d k rn | d
k rn | d k rn | d k rn | d
k rn | d k rn | d k rn | d k rn | d k rn | d k rn | j | qn WqX W| S)Nrh Fr r __abstractmethods__r% ri r r rp r2 r r r r r r rd ) r r rA r r r keysrL add)r[ Zprotocol_basesr r3 r r rC rC rD r2 s: !
z!_ProtocolMeta._get_protocol_attrs)rA rd r@ rg r r r2 rC rC )rZ rD r0 g s r0 c @ s" e Z d Z d Z f Z d Z d S)r zInternal base class for protocol classes.
This implements a simple-minded structural issubclass check
(similar but more general than the one-offs in collections.abc
such as Hashable).
TN)rA rd r@ rg rp rh rC rC rC rD r s r Awaitablec @ s e Z d Z f Z d S)r7 N)rA rd r@ rp rC rC rC rD r7 s Coroutinec @ s e Z d Z f Z d S)r8 N)rA rd r@ rp rC rC rC rD r8 s
AsyncIterablec @ s e Z d Z f Z d S)r9 N)rA rd r@ rp rC rC rC rD r9 s c @ s e Z d Z f Z d S)
AsyncIteratorN)rA rd r@ rp rC rC rC rD r: s r: c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r s c @ s1 e Z d Z f Z e e d d d Z d S)r* )returnc C s d S)NrC )r[ rC rC rD __int__ s zSupportsInt.__int__N)rA rd r@ rp r intr< rC rC rC rD r* s c @ s1 e Z d Z f Z e e d d d Z d S)r) )r; c C s d S)NrC )r[ rC rC rD __float__ s zSupportsFloat.__float__N)rA rd r@ rp r floatr> rC rC rC rD r) s c @ s1 e Z d Z f Z e e d d d Z d S)r( )r; c C s d S)NrC )r[ rC rC rD __complex__ s zSupportsComplex.__complex__N)rA rd r@ rp r complexr@ rC rC rC rD r( s c @ s1 e Z d Z f Z e e d d d Z d S)r' )r; c C s d S)NrC )r[ rC rC rD __bytes__ s zSupportsBytes.__bytes__N)rA rd r@ rp r bytesrB rC rC rC rD r' s c @ s1 e Z d Z f Z e e d d d Z d S)r& )r; c C s d S)NrC )r[ rC rC rD __abs__ s zSupportsAbs.__abs__N)rA rd r@ rp r r rD rC rC rC rD r& s c @ s7 e Z d Z f Z e d e e d d d Z d S)r+ r )ndigitsr; c C s d S)NrC )r[ rE rC rC rD __round__ s zSupportsRound.__round__N)rA rd r@ rp r r= r rF rC rC rC rD r+ s c @ s e Z d Z f Z d S)r% N)rA rd r@ rp rC rC rC rD r% s c @ s1 e Z d Z f Z e d d d d Z d S)r% zIterator[T_co])r; c C s d S)NrC )r[ rC rC rD __reversed__ s zReversible.__reversed__N)rA rd r@ rp r rG rC rC rC rD r% s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r s
Collectionc @ s e Z d Z f Z d S)rH N)rA rd r@ rp rC rC rC rD rH % s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r / s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r 3 s c @ s e Z d Z f Z d S)r! N)rA rd r@ rp rC rC rC rD r! 8 s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r > s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r B s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r G s c @ s e Z d Z f Z d S)r" N)rA rd r@ rp rC rC rC rD r" M s c @ s e Z d Z f Z d S)r" N)rA rd r@ rp rC rC rC rD r" Q s c @ s e Z d Z f Z d S)r" N)rA rd r@ rp rC rC rC rD r" U s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r Z s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r ^ s c @ s" e Z d Z f Z d d Z d S)r0 c O s. t | t r t d t t | | | S)Nz4Type List cannot be instantiated; use list() instead)r r0 rP r
r )rV r\ r] rC rC rD rU f s z List.__new__N)rA rd r@ rp rU rC rC rC rD r0 b s c @ s" e Z d Z f Z d d Z d S)r- c O s5 t | t r t j | | St t j | | | S)N)r r- collectionsdequer
)rV r\ r] rC rC rD rU q s z
Deque.__new__N)rA rd r@ rp rU rC rC rC rD r- m s c @ s" e Z d Z f Z d d Z d S)r1 c O s. t | t r t d t t | | | S)Nz2Type Set cannot be instantiated; use set() instead)r r1 rP r
r )rV r\ r] rC rC rD rU { s z Set.__new__N)rA rd r@ rp rU rC rC rC rD r1 w s c @ s" e Z d Z f Z d d Z d S)r2 c O s. t | t r t d t t | | | S)Nz>Type FrozenSet cannot be instantiated; use frozenset() instead)r r2 rP r
r )rV r\ r] rC rC rD rU s zFrozenSet.__new__N)rA rd r@ rp rU rC rC rC rD r2 s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r s c @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r s c @ s e Z d Z f Z d S)r$ N)rA rd r@ rp rC rC rC rD r$ s AbstractContextManagerc @ s e Z d Z f Z d S)r N)rA rd r@ rp rC rC rC rD r s c @ sI e Z d Z f Z d d Z e j d d Z e d d Z d S)r c C s | S)NrC )r[ rC rC rD __enter__ s zContextManager.__enter__c C s d S)NrC )r[ exc_type exc_value tracebackrC rC rD __exit__ s zContextManager.__exit__c C sL | t k rH t d d | j D rH t d d | j D rH d St S)Nc s s | ] } d | j k Vq d S)rL N)r )r BrC rC rD r s z2ContextManager.__subclasshook__..c s s | ] } d | j k Vq d S)rP N)r )r rQ rC rC rD r s T)r r r r} )rV CrC rC rD r s
z ContextManager.__subclasshook__N)
rA rd r@ rp rL r r rP classmethodr rC rC rC rD r s AbstractAsyncContextManagerc @ s e Z d Z f Z d S)AsyncContextManagerN)rA rd r@ rp rC rC rC rD rU s rU a
class AsyncContextManager(Generic[T_co]):
__slots__ = ()
async def __aenter__(self):
return self
@abc.abstractmethod
async def __aexit__(self, exc_type, exc_value, traceback):
return None
@classmethod
def __subclasshook__(cls, C):
if cls is AsyncContextManager:
if sys.version_info[:2] >= (3, 6):
return _collections_abc._check_methods(C, "__aenter__", "__aexit__")
if (any("__aenter__" in B.__dict__ for B in C.__mro__) and
any("__aexit__" in B.__dict__ for B in C.__mro__)):
return True
return NotImplemented
__all__.append('AsyncContextManager')
c @ s" e Z d Z f Z d d Z d S)r. c O s. t | t r t d t t | | | S)Nz4Type Dict cannot be instantiated; use dict() instead)r r. rP r
r )rV r\ r] rC rC rD rU s z Dict.__new__N)rA rd r@ rp rU rC rC rC rD r. s c @ s" e Z d Z f Z d d Z d S)r/ c O s5 t | t r t j | | St t j | | | S)N)r r/ rI defaultdictr
)rV r\ r] rC rC rD rU s zDefaultDict.__new__N)rA rd r@ rp rU rC rC rC rD r/ s c @ s" e Z d Z f Z d d Z d S)r, c O s5 t | t r t j | | St t j | | | S)N)r r, rI r
)rV r\ r] rC rC rD rU s zCounter.__new__N)rA rd r@ rp rU rC rC rC rD r, s ChainMapc @ s" e Z d Z f Z d d Z d S)rX c O s5 t | t r t j | | St t j | | | S)N)r rX rI r
)rV r\ r] rC rC rD rU s zChainMap.__new__N)rA rd r@ rp rU rC rC rC rD rX s c @ s" e Z d Z f Z d d Z d S)r4 c O s. t | t r t d t t | | | S)Nz@Type Generator cannot be instantiated; create a subclass instead)r r4 rP r
_G_base)rV r\ r] rC rC rD rU s zGenerator.__new__N)rA rd r@ rp rU rC rC rC rD r4 s AsyncGeneratorc @ s e Z d Z f Z d S)rZ N)rA rd r@ rp rC rC rC rD rZ s CT_cor c @ s e Z d Z d Z f Z d S)r a A special construct usable to annotate class objects.
For example, suppose we have the following classes::
class User: ... # Abstract base for User classes
class BasicUser(User): ...
class ProUser(User): ...
class TeamUser(User): ...
And a function that takes a class argument that's a subclass of
User and returns an instance of the corresponding class::
U = TypeVar('U', bound=User)
def new_user(user_class: Type[U]) -> U:
user = user_class()
# (Here we could write the user object to a database)
return user
joe = new_user(BasicUser)
At this point the type checker knows that joe has type BasicUser.
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r Yn X| S)NzDNamedTuple('Name', [(f0, t0), (f1, t1), ...]); each t must be a typec s+ g | ]! \ } } | t | f q SrC )r| )r nr )r rC rD
I s z!_make_nmtuple..c S s g | ] \ } } | q SrC rC )r r\ r rC rC rD r] J s r rA __main__) rI
namedtuple OrderedDictr% _field_typesr> r r r' rd r r )rW r nm_tplrC )r rD
_make_nmtupleG s %rc rU r^ rp __getnewargs___fields_field_defaultsra _make_replace_asdict_sourcerd rA r@ r% c s" e Z d Z f d d Z S)NamedTupleMetac sb | j d d r+ t j | | | | St s= t d | j d i } t | | j } g } i } xq | D]i } | | k r | | } | j | | | | = 3.6::
class Employee(NamedTuple):
name: str
id: int
This is equivalent to::
Employee = collections.namedtuple('Employee', ['name', 'id'])
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)
In Python versions <= 3.5 use::
Employee = NamedTuple('Employee', [('name', str), ('id', int)])
TNc K sS | r t r t d | d k r4 | j } n | rF t d t | | S)Nz>Keyword syntax for NamedTuple is only supported in Python 3.6+zIEither list of fields or keywords can be provided to NamedTuple, not both)rm rP r( rc )r[ rq ZfieldskwargsrC rC rD rU s
zNamedTuple.__new__)rA rd r@ rg rO rU rC rC rC rD r3 s c C s" d d } | | _ | | _ | S)a% NewType creates simple unique types with almost zero
runtime overhead. NewType(name, tp) is considered a subtype of tp
by static type checkers. At runtime, NewType(name, tp) returns
a dummy function that simply returns its argument. Usage::
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
c S s | S)NrC )rB rC rC rD new_type s zNewType..new_type)rA Z
__supertype__)rW r ru rC rC rD r8 s Fc @ sg e Z d Z d Z f Z e e d d d Z e e d d d Z e d d d d Z
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d+ d, d- Z e e e d d. d/ d0 Z e d1 d d2 d3 Z e d d d4 d5 Z d S)9IOa Generic base class for TextIO and BinaryIO.
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.
)r; c C s d S)NrC )r[ rC rC rD mode s zIO.modec C s d S)NrC )r[ rC rC rD rW s zIO.nameNc C s d S)NrC )r[ rC rC rD close s zIO.closec C s d S)NrC )r[ rC rC rD closed s z IO.closedc C s d S)NrC )r[ rC rC rD fileno s z IO.filenoc C s d S)NrC )r[ rC rC rD flush s zIO.flushc C s d S)NrC )r[ rC rC rD isatty s z IO.isattyrK )r\ r; c C s d S)NrC )r[ r\ rC rC rD read s zIO.readc C s d S)NrC )r[ rC rC rD readable s z IO.readable)limitr; c C s d S)NrC )r[ r rC rC rD readline s z IO.readline)hintr; c C s d S)NrC )r[ r rC rC rD readlines s z IO.readlinesr )offsetwhencer; c C s d S)NrC )r[ r r rC rC rD seek s zIO.seekc C s d S)NrC )r[ rC rC rD seekable
s z IO.seekablec C s d S)NrC )r[ rC rC rD tell s zIO.tell)sizer; c C s d S)NrC )r[ r rC rC rD truncate s z IO.truncatec C s d S)NrC )r[ rC rC rD writable s z IO.writable)sr; c C s d S)NrC )r[ r rC rC rD write s zIO.write)linesr; c C s d S)NrC )r[ r rC rC rD
writelines s z
IO.writelinesz
IO[AnyStr]c C s d S)NrC )r[ rC rC rD rL " s z IO.__enter__c C s d S)NrC )r[ rn r rO rC rC rD rP & s z IO.__exit__r r r ) rA rd r@ rg rp r rl rw rW r rx r ry r= rz r{ r| r5 r} r~ r r0 r r r r r r r r rL rP rC rC rC rD rv sT "! rv c @ s_ e Z d Z d Z f Z e e e e f e d d d Z
e d d d d Z d S) BinaryIOz5Typed version of the return of open() in binary mode.)r r; c C s d S)NrC )r[ r rC rC rD r 0 s zBinaryIO.write)r; c C s d S)NrC )r[ rC rC rD rL 4 s zBinaryIO.__enter__N) rA rd r@ rg rp r r rC bytearrayr= r rL rC rC rC rD r + s %r c @ s e Z d Z d Z f Z e e d d d Z e e d d d Z e e
e d d d Z e e d d d
Z
e e d d d Z e d d d
d Z d S)TextIOz3Typed version of the return of open() in text mode.)r; c C s d S)NrC )r[ rC rC rD buffer> s z
TextIO.bufferc C s d S)NrC )r[ rC rC rD encodingB s zTextIO.encodingc C s d S)NrC )r[ rC rC rD errorsF s z
TextIO.errorsc C s d S)NrC )r[ rC rC rD line_bufferingJ s zTextIO.line_bufferingc C s d S)NrC )r[ rC rC rD newlinesN s zTextIO.newlinesc C s d S)NrC )r[ rC rC rD rL R s zTextIO.__enter__N)rA rd r@ rg rp r r r rl r r r r r r
r r rL rC rC rC rD r 9 s r c @ s7 e Z d Z d Z d d d g Z e Z e Z e Z d S)ioz)Wrapper namespace for IO generic classes.rv r r N)rA rd r@ rg __all__rv r r rC rC rC rD r W s
r z.ioPatternr c C s | j S)N)pattern)r rC rC rD e s r Matchc C s
| j j S)N)rer )mrC rC rD r g s c @ s. e Z d Z d Z d d g Z e Z e Z d S)r z&Wrapper namespace for re type aliases.r r N)rA rd r@ rg r r r rC rC rC rD r j s r z.re)r r r rI
contextlibr r Z stdlib_rer> r collections.abcZcollections_abc ImportErrorr? _collections_abcr r r rn r r^ __str__rl rQ r rE rM rN rH rI rG rF rc r ra r| rS r r
r ZNoReturnr r r r r r r r rC r5 r r r r r r r r r r r r r r r r r r
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r r r rm r r r r r r6 r" r BuiltinFunctionType
MethodType
ModuleTyper) r7 r9 r: r/ r; r0 r r r r7 r r8 r9 r: r r r* r) r( r' r& r+ r% r# r rH r1 r r! r r r" r r= r r r0 rJ r- r r r2 r r r r$ rK r rT rU execr r. rW r/ r, rX r4 rY
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