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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``. rWÚtype_varÚ impl_typeÚtype_checkercCs³t|tƒs!tt|ƒƒ‚t|tƒsBtt|ƒƒ‚t|tƒsdtt|ƒƒ‚t|ttfƒs‹tt|ƒƒ‚||_||_||_ ||_ dS)atInitializer. 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)rkrlÚAssertionErrorÚreprrnrNrHrWr…r†r‡)r[rWr…r†r‡rCrCrDr^s!!"' z_TypeAlias.__init__cCsd|jt|jƒfS)Nz%s[%s])rWrSr…)r[rCrCrDrf,sz_TypeAlias.__repr__cCs¸t|jtƒs"td|ƒ‚|jjrkt|tƒrkt||jjƒsktd||jfƒ‚t|tƒr™||jk r™td|ƒ‚|j|j||j |j ƒS)Nz#%s cannot be further parameterized.z&%s is not a valid substitution for %s.z%s cannot be re-parameterized.)rkr…rrPÚ__constraints__rnÚ issubclassrZrWr†r‡)r[Z parameterrCrCrDÚ__getitem__/sz_TypeAlias.__getitem__cCs5t|tƒstS|j|jko4|j|jkS)N)rkrFr}rWr…)r[r~rCrCrDr;sz_TypeAlias.__eq__cCst|j|jfƒS)N)r€rWr…)r[rCrCrDr@sz_TypeAlias.__hash__cCs.t|jtƒstdƒ‚t||jƒS)Nz NoReturn: raise Exception('no way') This type is invalid in other positions, e.g., ``List[NoReturn]`` will fail in static type checkers. cCstdƒ‚dS)Nz*NoReturn cannot be used with isinstance().)rP)r[r‚rCrCrDrƒ»sz_NoReturn.__instancecheck__cCstdƒ‚dS)Nz*NoReturn cannot be used with issubclass().)rP)r[rVrCrCrDr„¾sz_NoReturn.__subclasscheck__N)rArdr@rgrprƒr„rCrCrCrDrœ¬srœc speZdZdZdZddd d dd ‡fdd †Zdd„Zdd„Zdd„Zdd„Z ‡S)ra—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) rAÚ __bound__rŠÚ __covariant__Ú__contravariant__ÚboundNÚ covariantFÚ contravariantc sötƒj||d|d|d|Œ||_|rF|rFtdƒ‚t|ƒ|_t|ƒ|_|r‚|dk r‚tdƒ‚|r¦t|ƒdkr¦tdƒ‚d‰t ‡fd d †|Dƒƒ|_ |rét|dƒ|_n d|_dS)Nr r¡r¢z"Bivariant types are not supported.z-Constraints cannot be combined with bound=...rKz"A single constraint is not allowedz:TypeVar(name, constraint, ...): constraints must be types.c3s|]}t|ˆƒVqdS)N)r|)Ú.0rŽ)r˜rCrDú sz#TypeVar.__init__..zBound must be a type.) rTr^rAÚ ValueErrorÚboolržrŸrPrjrmrŠr|r)r[rWr r¡r¢Zconstraints)rZ)r˜rDr^òs "zTypeVar.__init__cCs||kr|j|ƒdS)N)Úappend)r[rbrCrCrDrcszTypeVar._get_type_varscCs5|jrd}n|jr$d}nd}||jS)Nú+ú-ú~)ržrŸrA)r[ÚprefixrCrCrDrf s zTypeVar.__repr__cCstdƒ‚dS)Nz0Type variables cannot be used with isinstance().)rP)r[ÚinstancerCrCrDrƒszTypeVar.__instancecheck__cCstdƒ‚dS)Nz0Type variables cannot be used with issubclass().)rP)r[rVrCrCrDr„szTypeVar.__subclasscheck__)rArrŠržrŸ) rArdr@rgrpr^rcrfrƒr„rCrC)rZrDrÅs( ÚTÚKTÚVTÚT_cor¡ÚV_coÚVT_coÚT_contrar¢cCsŠ|dkrg}t|dƒrFt|ttfƒrF|j||ƒSt|tƒr†x.t|ƒD] \}}||krb||SqbW|S)zÍAn internal helper function: replace arg if it is a type variable found in tvars with corresponding substitution from args or with corresponding substitution sub-tree if arg is a generic type. NÚ _subs_tree)ÚhasattrrkrrHr´rÚ enumerate)rzrbr\ÚiZtvarrCrCrDÚ_replace_arg)s$r¸c CsÒ|jdkr|S|j}g}x)|jdk rM|j|ƒ|j}q%Wg}x*|jD]}|jt|||ƒƒq^WxJ|D]B}g}x-|jD]"}|jt||j|ƒƒqžW|}qˆW|S)aòAn 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§Ú__args__r¸Ú__parameters__) rVrbr\ZcurrentZ orig_chainÚ tree_argsrzZoclsZ new_tree_argsrCrCrDr´Ds r´cs™g}x—|D]}t|tƒrD|jtkrD|j|jƒq t|tƒrt|ƒdkr|dtkr|j|dd…ƒq |j|ƒq Wt |ƒ‰tˆƒt|ƒkrg}x4|D],}|ˆkrÑ|j|ƒˆj |ƒqÑW|}ˆstˆƒ‚t |ƒ‰xS|D]K‰tˆtƒsEq-t ‡fdd†ˆˆhDƒƒr-ˆj ˆƒq-Wt‡fdd†|DƒƒS)zAn internal helper for Union creation and substitution: flatten Union's among parameters, then remove duplicates and strict subclasses. rrKNc3sK|]A}t|tƒo$|jdk st|tƒoBtˆ|ƒVqdS)N)rkrr“rnr‹)r£Zt2)Út1rCrDr¤†sz'_remove_dups_flatten..c3s!|]}|ˆkr|VqdS)NrC)r£rŽ)Ú all_paramsrCrDr¤‹s)rkr‘r“rÚextendr¹rmrjr§ÚsetÚremoverˆrnÚany)Ú parametersÚparamsÚpZ new_paramsrŽrC)r½r¼rDÚ_remove_dups_flattenes0 1 rÅcCs~|jstdt|ƒƒ‚t|ƒ}t|jƒ}||krztd||kr^dndt|ƒ||fƒ‚dS)Nz%s is not a generic classz0Too %s parameters for %s; actual %s, expected %sZmanyZfew)rºrPr‰rj)rVrÂZalenZelenrCrCrDÚ_check_genericŽs rÆcsJtjƒˆƒ‰tjˆjƒtjˆƒ‡‡fdd†ƒ}|S)zInternal wrapper caching __getitem__ of generic types with a fallback to original function for non-hashable arguments. cs3yˆ||ŽSWntk r%YnXˆ||ŽS)N)rP)r\r])ÚcachedÚfuncrCrDÚinner¤s z_tp_cache..inner)Ú functoolsÚ lru_cacheÚ _cleanupsr§Úcache_clearÚwraps)rÈrÉrC)rÇrÈrDÚ _tp_cacheœs$rÏcsÊeZdZdZdZdddd‡fd d †Zdd„Zd d„Z‡fdd†Z‡fdd†Z e dd„ƒZdddd„Zdd„Z dd„Zdd„Zdd„Z‡S) r‘aÃUnion 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]. rºr¹r“Ú __tree_hash__NrOFcstƒj||||d|Œ}|dkrad|_d|_d|_ttdƒƒ|_|St|t ƒs|t dƒ‚|tkr®t|ƒ}t |ƒdkr®|dSt|ƒ|_||_||_|jƒ}t|t ƒrtt|ƒƒ|_nt|ƒ|_|S)NrOrzExpected parameters=rKr)r)rTrUrºr¹r“r€Ú frozensetrÐrkrmrPrrÅrjrr´)rVrÂÚoriginrOr\r[Z subs_tree)rZrCrDrUÜs*! z_Union.__new__cs…|jdkr|St‡‡fdd†|jDƒƒ}t|jˆˆƒ}||jkro||jkro|S|j||ddƒS)Nc3s!|]}t|ˆˆƒVqdS)N)ra)r£rŽ)r_r`rCrDr¤úsz$_Union._eval_type..rOT)r¹rmrar“rZ)r[r_r`Úev_argsÚ ev_originrC)r_r`rDra÷s%z_Union._eval_typecCs&|jr"|jr"t|j|ƒdS)N)r“rºrc)r[rbrCrCrDrcsz_Union._get_type_varscsR|jdkrtƒjƒS|jƒ}t|tƒsAt|ƒS|dj|ƒS)Nr)r“rTrfr´rkrmr‰Ú _tree_repr)r[Útree)rZrCrDrfs z_Union.__repr__cs~g}xW|dd…D]E}t|tƒsB|jt|ƒƒq|j|dj|ƒƒqWtƒjƒddj|ƒS)NrKrz[%s]z, )rkrmr§rSrÕrTrfrQ)r[rÖÚarg_listrz)rZrCrDrÕ sz_Union._tree_reprcsŸ|fkrtdƒ‚t|tƒs0|f}|jdkrHd‰nd‰t‡fdd†|Dƒƒ}|tk r†t||ƒ|j|d|ddƒS) Nz Cannot take a Union of no types.z)Union[arg, ...]: each arg must be a type.z*Parameters to generic types must be types.c3s|]}t|ˆƒVqdS)N)r|)r£rÄ)r˜rCrDr¤ sz%_Union.__getitem__..rÒrOT)rPrkrmr“rrÆrZ)r[rÂrC)r˜rDrŒs z_Union.__getitem__cCsS|tkrtSt|||ƒ}t|ƒ}t|ƒdkrH|dStf|S)NrKr)rr´rÅrj)r[rbr\r»rCrCrDr´%sz_Union._subs_treecCsIt|tƒr|j|jkS|tk r;|jƒ|kS||kSdS)N)rkr‘rÐrr´)r[r~rCrCrDr.s z _Union.__eq__cCs|jS)N)rÐ)r[rCrCrDr6sz_Union.__hash__cCstdƒ‚dS)Nz(Unions cannot be used with isinstance().)rP)r[r‚rCrCrDrƒ9sz_Union.__instancecheck__cCstdƒ‚dS)Nz(Unions cannot be used with issubclass().)rP)r[rVrCrCrDr„<sz_Union.__subclasscheck__)rºr¹r“rÐ)rArdr@rgrprUrarcrfrÕrÏrŒr´rrrƒr„rCrC)rZrDr‘®s* r‘c@s.eZdZdZfZedd„ƒZdS)r’zEOptional type. Optional[X] is equivalent to Union[X, None]. cCs#t|dƒ}t|tdƒfS)Nz#Optional[t] requires a single type.)r|rrn)r[rzrCrCrDrŒKsz_Optional.__getitem__N)rArdr@rgrprÏrŒrCrCrCrDr’Csr’cCs8t|tƒst‚x|jdk r3|j}qW|S)z@Return the farthest origin of a generic class (internal helper).N)rkrrˆr“)ÚarCrCrDr–Ts r–cCs:t|tƒrt|tƒs$t‚t|ƒt|ƒkS)a6Return 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. )rkrrˆr–)rØÚbrCrCrDÚ_geqv\s $rÚcCsft}xYt|jdd…ƒD]>\}}t|tƒr t|ƒtkr |j|d}q W|S)z€Helper for Generic.__new__. Returns the class after the last occurrence of Generic or Generic[...] in cls.__mro__. NrKéÿÿÿÿ)Úobjectr¶Ú__mro__rkrr–r )rVZnext_in_mror·ÚcrCrCrDÚ_next_in_mroks &!rßcs@tˆjtjƒr*‡fdd†}n‡fdd†}|S)zConstruct a __subclasshook__ callable that incorporates the associated __extra__ class in subclass checks performed against cls. cs{ˆjj|ƒ}|tk r"|Sˆj|jkr8dSx<ˆjjƒD]+}t|tƒr`qHt||ƒrHdSqHWtS)NT)Ú __extra__Ú__subclasshook__r}rÝÚ__subclasses__rkrr‹)ÚsubclassÚresÚscls)rVrCrDÚ __extrahook__‚sz)_make_subclasshook..__extrahook__cs#ˆjrt|ˆjƒrdStS)NT)ràr‹r})rã)rVrCrDræs)rkràÚabcÚABCMeta)rVrærC)rVrDÚ_make_subclasshookysrécCsAt|ƒ}d|kr=x"|dD]}|j|dƒq#W|S)zInternal helper: copy class __dict__ and clean slots class variables. (They will be re-created if necessary by normal class machinery.) rpN)ÚdictÚpop)ZdctZ dict_copyZslotrCrCrDÚ_no_slots_copy—s rìcs9eZdZdZddddd‡fdd†Zedd„ƒZejdd„ƒZedd „ƒZejd d „ƒZdd„Z d d„Z ‡fdd†Z‡fdd†Zdddd„Z dd„Zdd„Zedd„ƒZ‡fdd†Zdd„Zdd „Z‡fd!d"†Z‡S)#racMetaclass for generic types. This is a metaclass for typing.Generic and generic ABCs defined in typing module. User defined subclasses of GenericMeta can override __new__ and invoke super().__new__. Note that GenericMeta.__new__ has strict rules on what is allowed in its bases argument: * plain Generic is disallowed in bases; * Generic[...] should appear in bases at most once; * if Generic[...] is present, then it should list all type variables that appear in other bases. In addition, type of all generic bases is erased, e.g., C[int] is stripped to plain C. Nc s‹|dk rF|dk st‚tdd„|Dƒƒst|ƒ‚nI|dks^t|ƒ‚|dksvt|ƒ‚|dksŽt|ƒ‚t|ƒ}d} xe|D]]} | tkrÅtdƒ‚t| tƒr§| jtkr§| dk rûtdƒ‚| j} q§W| dkr|} nrt |ƒ}t | ƒ‰|ˆks‰tddj ‡fdd†|Dƒƒdj d d„| Dƒƒfƒ‚| }|}|dk rÏt|ƒtj krÏ||krÏ|f|}td d„|Dƒƒ}tdd„|Dƒƒrtdd„|Dƒƒ}|jd |d|iƒtƒj||||ddƒ} || _|r|tdd„|Dƒƒnd| _t| ƒ| _|dkr©|| _d|kr»|sÖt| jddƒdkråt| ƒ| _t|tj ƒr|j| _|j| _n$|dk r6|j| _|j| _|rWt|dƒrW|j| _|rot| jƒƒntt| ƒj ƒ| _!| S)zÑCreate a new generic class. 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Ú__type__NcKs ||_dS)N)r)r[Útpr]rCrCrDr^„sz_ClassVar.__init__cCspt|ƒ}|jdkrJ|t|dj|jdd…ƒƒddƒStdj|jdd…ƒƒ‚dS)Nz{} accepts only single type.rKrOTz {} cannot be further subscripted)rnrr|ÚformatrArP)r[ÚitemrVrCrCrDrŒ‡s z_ClassVar.__getitem__cCs>t|j||ƒ}||jkr(|St|ƒ|ddƒS)NrOT)rarrn)r[r_r`Znew_tprCrCrDrasz_ClassVar._eval_typecs>tƒjƒ}|jdk r:|djt|jƒƒ7}|S)Nz[{}])rTrfrrrS)r[Úr)rZrCrDrf–sz_ClassVar.__repr__cCstt|ƒj|jfƒS)N)r€rnrAr)r[rCrCrDrœsz_ClassVar.__hash__cCs<t|tƒstS|jdk r2|j|jkS||kS)N)rkrr}r)r[r~rCrCrDrŸs z_ClassVar.__eq__)r)rArdr@rgrpr^rŒrarfrrrCrC)rZrDrqs rcCs|S)zÿCast a value to a type. This returns the value unchanged. 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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. N)rArdr@rgrprCrCrCrDr,scs›d‰‡fdd†|Dƒ}tj|dd„|Dƒƒ}tj|ƒ|_|_y%tjdƒjjddƒ|_ Wnt tfk r–YnX|S)NzDNamedTuple('Name', [(f0, t0), (f1, t1), ...]); each t must be a typecs+g|]!\}}|t|ˆƒf‘qSrC)r|)r£ÚnrŽ)r˜rCrDú Is z!_make_nmtuple..cSsg|]\}}|‘qSrCrC)r£r\rŽrCrCrDr]Js rrAÚ__main__)rIÚ namedtupleÚOrderedDictr%Ú_field_typesr>rrr'rdrr¥)rWrÚnm_tplrC)r˜rDÚ _make_nmtupleGs%rcrUr^rpÚ__getnewargs__Ú_fieldsÚ_field_defaultsraÚ_makeÚ_replaceÚ_asdictÚ_sourcerdrAr@r%cs"eZdZ‡fdd†Z‡S)ÚNamedTupleMetacsb|jddƒr+tƒj||||ƒSts=tdƒ‚|jdiƒ}t||jƒƒ}g}i}xq|D]i}||kr||} |j| ƒ| ||= 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.) 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