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This overrides __new__() to require an extra keyword parameter '_root', which serves as a guard against naive subclassing of the typing classes. Any legitimate class defined using a metaclass derived from TypingMeta must pass _root=True. This also defines a dummy constructor (all the work for most typing constructs is done in __new__) and a nicer repr(). F)_rootcs2|s tddjtt|pdtj||||S)NzCannot subclass %sz, z()) TypeErrorjoinmap _type_reprsuper__new__)clsnamebases namespacerO) __class__rCrDrUszTypingMeta.__new__cOsdS)NrC)selfargskwdsrCrCrD__init__szTypingMeta.__init__cCs|S)a'Override this in subclasses to interpret forward references. 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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``. rWtype_var impl_type type_checkercCszt|tstt|t|ts,tt|t|t sDtt|t|ttfs^tt|||_||_||_ ||_ 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) rlrmAssertionErrorreprrorNrHrWrrr)r[rWrrrrCrCrDr^s z_TypeAlias.__init__cCsd|jt|jfS)Nz%s[%s])rWrSr)r[rCrCrDrf,sz_TypeAlias.__repr__cCst|jtstd||jjrJt|trJt||jjsJtd||jft|trj||jk rjtd||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.) rlrrrP__constraints__ro issubclassrZrWrr)r[Z parameterrCrCrD __getitem__/s    z_TypeAlias.__getitem__cCs&t|tstS|j|jko$|j|jkS)N)rlrFr~rWr)r[rrCrCrDr;s z_TypeAlias.__eq__cCst|j|jfS)N)rrWr)r[rCrCrDr@sz_TypeAlias.__hash__cCs t|jtstdt||jS)Nz NoReturn: raise Exception('no way') This type is invalid in other positions, e.g., ``List[NoReturn]`` will fail in static type checkers. cCs tddS)Nz*NoReturn cannot be used with isinstance().)rP)r[rrCrCrDrsz_NoReturn.__instancecheck__cCs tddS)Nz*NoReturn cannot be used with issubclass().)rP)r[rVrCrCrDrsz_NoReturn.__subclasscheck__N)rArdr@rgrqrrrCrCrCrDrs rcsNeZdZdZdZdddd fd d Zd d ZddZddZddZ Z S)raType 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__NF)bound covariant contravariantcstj|f||||d||_|r2|r2tdt||_t||_|rZ|dk rZtd|rrt|dkrrtddt fdd|D|_ |rt |d |_ nd|_ dS) N)rrrz"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|VqdS)N)r}).0r)rrCrD sz#TypeVar.__init__..zBound must be a type.) rTr^rA ValueErrorboolrrrPrkrnrr}r)r[rWrrrZ constraints)rZ)rrDr^s     zTypeVar.__init__cCs||kr|j|dS)N)append)r[rbrCrCrDrcszTypeVar._get_type_varscCs&|jr d}n|jrd}nd}||jS)N+-~)rrrA)r[prefixrCrCrDrf s zTypeVar.__repr__cCs tddS)Nz0Type variables cannot be used with isinstance().)rP)r[instancerCrCrDrszTypeVar.__instancecheck__cCs tddS)Nz0Type variables cannot be used with issubclass().)rP)r[rVrCrCrDrszTypeVar.__subclasscheck__)rArrrr) rArdr@rgrqr^rcrfrrrirCrC)rZrDrs( TKTVTT_co)rV_coVT_coT_contra)rcCsd|dkr g}t|dr0t|ttfr0|j||St|tr`x$t|D]\}}||krD||SqDW|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)hasattrrlrrHrr enumerate)r{rbr\iZtvarrCrCrD _replace_arg)s   rc Cs|jdkr|S|j}g}x|jdk r6|j||j}qWg}x |jD]}|jt|||qDWx8|D]0}g}x"|jD]}|jt||j|qtW|}qdW|S)aAn 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)rr__args__r__parameters__) rVrbr\ZcurrentZ orig_chain tree_argsr{ZoclsZ new_tree_argsrCrCrDrDs       rcs*g}xn|D]f}t|tr0|jtkr0|j|jq t|trft|dkrf|dtkrf|j|ddq |j|q Wt |tt|krg}x(|D] }|kr|j|j |qW|} st t |x>|D]6tt sqt fddhDrڈj qWtfdd|DS)zAn internal helper for Union creation and substitution: flatten Union's among parameters, then remove duplicates and strict subclasses. rrKNc3s6|].}t|to|jdk st|to,t|VqdS)N)rlrrror)rZt2)t1rCrDrs z'_remove_dups_flatten..c3s|]}|kr|VqdS)NrC)rr) all_paramsrCrDrs)rlrrrextendrrnrkrsetremoverroany) parametersparamspZ new_paramsrrC)rrrD_remove_dups_flattenes0 "     rcCsX|jstdt|t|}t|j}||krTtd||kr@dndt|||fdS)Nz%s is not a generic classz0Too %s parameters for %s; actual %s, expected %sZmanyZfew)rrPrrk)rVrZalenZelenrCrCrD_check_generics rcs4tjtjjtjfdd}|S)zInternal wrapper caching __getitem__ of generic types with a fallback to original function for non-hashable arguments. c s*y ||Stk rYnX||S)N)rP)r\r])cachedfuncrCrDinners  z_tp_cache..inner) functools lru_cache _cleanupsr cache_clearwraps)rrrC)rrrD _tp_caches  rcseZdZdZdZd ddfd d Zd d Zd dZfddZfddZ e ddZ d!ddZ ddZ ddZddZddZZS)"raUnion 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]. rrr __tree_hash__NF)rOcstj|||f|d|i}|dkrHd|_d|_d|_ttd|_|St|t sZt d|t kr~t |}t |dkr~|dSt||_||_||_|j}t|t rtt||_n t||_|S)NrOrzExpected parameters=rKr)r)rTrUrrrr frozensetrrlrnrPrrrkrr)rVroriginrOr\r[Z subs_tree)rZrCrDrUs*     z_Union.__new__cs^|jdkr|Stfdd|jD}t|j}||jkrN||jkrN|S|j||ddS)Nc3s|]}t|VqdS)N)ra)rr)r_r`rCrDrsz$_Union._eval_type..T)rO)rrnrarrZ)r[r_r`ev_args ev_originrC)r_r`rDras z_Union._eval_typecCs|jr|jrt|j|dS)N)rrrc)r[rbrCrCrDrcs z_Union._get_type_varscs<|jdkrtjS|j}t|ts.t|S|dj|S)Nr)rrTrfrrlrnr _tree_repr)r[tree)rZrCrDrfs    z_Union.__repr__cs`g}xB|ddD]2}t|ts0|jt|q|j|dj|qWtjddj|S)NrKrz[%s]z, )rlrnrrSrrTrfrQ)r[rarg_listr{)rZrCrDr s  z_Union._tree_reprcsl|fkrtdt|ts |f}|jdkr0dndtfdd|D}|tk r\t|||j||ddS)Nz Cannot take a Union of no types.z)Union[arg, ...]: each arg must be a type.z*Parameters to generic types must be types.c3s|]}t|VqdS)N)r})rr)rrCrDr sz%_Union.__getitem__..T)rrO)rPrlrnrrrrZ)r[rrC)rrDrs   z_Union.__getitem__cCs>|tkr tSt|||}t|}t|dkr4|dStf|S)NrKr)rrrrk)r[rbr\rrCrCrDr%s  z_Union._subs_treecCs6t|tr|j|jkS|tk r*|j|kS||kSdS)N)rlrrrr)r[rrCrCrDr.s    z _Union.__eq__cCs|jS)N)r)r[rCrCrDr6sz_Union.__hash__cCs tddS)Nz(Unions cannot be used with isinstance().)rP)r[rrCrCrDr9sz_Union.__instancecheck__cCs tddS)Nz(Unions cannot be used with issubclass().)rP)r[rVrCrCrDr<sz_Union.__subclasscheck__)rrrr)NN)NN)rArdr@rgrqrUrarcrfrrrrrrrrrirCrC)rZrDrs*    rc@s eZdZdZfZeddZdS)rzEOptional type. 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Nc s|dk r0|dk sttdd|Ds.t|n|dks@t||dksPt||dks`t|t|}d} xF|D]>} | tkrtdt| trr| jtkrr| dk rtd| j} qrW| dkr|} nRt |} t | | kstddj fdd|Ddj d d| Df| }|} |dk rFt |t j krF||krF|f|}td d|D}td d|Dr~td d|D}|j|||sdn|jd tj||||dd} tt| jd|s| n|j|| _|rtdd|Dnd| _t| | _|dkr| | _d|kr|s2t| jdddkr.z!Cannot inherit from plain Genericz0Cannot inherit from Generic[...] multiple types.z6Some type variables (%s) are not listed in Generic[%s]z, c3s|]}|krt|VqdS)N)rm)rr)gvarsetrCrDrscss|]}t|VqdS)N)rm)rgrCrCrDrscss"|]}t|tr|jn|VqdS)N)rlrr)rbrCrCrDrscss |]}t|to|tk VqdS)N)rlrr )rrrCrCrDrscss|]}|tk r|VqdS)N)r )rrrCrCrDrs)rrrT)rOrcss*|]"}|tkrdn|tkrfn|VqdS).N)_TypingEllipsis _TypingEmpty)rarCrCrDrsrrArr@)$rallrr rPrlrrrrrQrorrrnrupdaterrTrU __setattr__rr__next_in_mro____orig_bases__rrr _abc_registry _abc_cacherr@rrrr)rVrWrXrYrbr\rextra orig_basesZgvarsbaseZtvarsetZ initial_basesr[)rZ)rrDrUsr      $       zGenericMeta.__new__cCst|jtjr|jjS|jjS)N)rlrrr_abc_negative_cacher_abc_generic_negative_cache)r[rCrCrDrszGenericMeta._abc_negative_cachecCs,|jdkr(t|jtjr"||j_n||_dS)N)rrlrrrrr)r[valuerCrCrDrs  cCst|jtjr|jjS|jjS)N)rlrrr_abc_negative_cache_versionr#_abc_generic_negative_cache_version)r[rCrCrDr sz'GenericMeta._abc_negative_cache_versioncCs,|jdkr(t|jtjr"||j_n||_dS)N)rrlrrrrr)r[rrCrCrDrs  cCs|jr|jrt|j|dS)N)rrrc)r[rbrCrCrDrcs zGenericMeta._get_type_varsc s|jr|jjnd}|jr8tfdd|jDnd}||jkrT||jkrT|S|j|j|jt|j|rtt |nd|||j |j dS)Nc3s|]}t|VqdS)N)ra)rr)r_r`rCrDrsz)GenericMeta._eval_type..)rbr\rrr) rrarrnrZrA __bases__r__dict__rrr)r[r_r`rrrC)r_r`rDras$zGenericMeta._eval_typecs"|jdkrtjS|j|jS)N)rrTrfrr)r[)rZrCrDrf+s  zGenericMeta.__repr__cstg}xV|ddD]F}|fkr*|jdqt|tsD|jt|q|j|dj|qWtjddj|S)NrKz()rz[%s]z, )rrlrnrSrrTrfrQ)r[rrr{)rZrCrDr0s  zGenericMeta._tree_reprcCs*|jdkr|St|||}|jft|S)N)rrrrn)r[rbr\rrCrCrDr;s  zGenericMeta._subs_treecCs6t|tstS|jdks"|jdkr*||kS|j|jkS)N)rlrr~rr)r[rrCrCrDrAs  zGenericMeta.__eq__cCs|jS)N)r)r[rCrCrDrHszGenericMeta.__hash__c s6t|ts|f}| r0|jtk r0tdt|dtfdd|D}|tkrtdd|Dsltdtt |t|krtd|}|}nb|tt fkrt |}|}nH|t kr|}|}n6|j tt fkrtdt|nt||t |}|}|j dkr|fnf}|j|j||jt|j||||j|jd S) Nz)Parameter list to %s[...] cannot be emptyz*Parameters to generic types must be types.c3s|]}t|VqdS)N)r})rr)rrCrDrSsz*GenericMeta.__getitem__..css|]}t|tVqdS)N)rlr)rrrCrCrDrVsz5Parameters to Generic[...] must all be type variablesz-Parameters to Generic[...] must all be uniquez'Cannot subscript already-subscripted %s)rbr\rrr)rlrnrrrPrEr rrkrr rrrrrrZrArrrrr)r[rrbr\ZprependrC)rrDrKsJ   zGenericMeta.__getitem__csJ|jdk r*tjdjddkr&tddS|tkr>td|tj|S) NrKrArrzCParameterized generics cannot be used with class or instance checksFz5Class %r cannot be used with class or instance checks)rr)rr> _getframe f_globalsrPr rTr)r[rV)rZrCrDrys zGenericMeta.__subclasscheck__cCs t|j|S)N)rrZ)r[rrCrCrDrszGenericMeta.__instancecheck__csT|jdr|jds(|jds(|jdkr VT: ... # Etc. 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For example, suppose we have the following classes:: class User: ... # Abstract base for User classes class BasicUser(User): ... class ProUser(User): ... class TeamUser(User): ... And a function that takes a class argument that's a subclass of User and returns an instance of the corresponding class:: U = TypeVar('U', bound=User) def new_user(user_class: Type[U]) -> U: user = user_class() # (Here we could write the user object to a database) return user joe = new_user(BasicUser) At this point the type checker knows that joe has type BasicUser. N)rArdr@rgrqrCrCrCrDr$sc svdfdd|D}tj|dd|D}tj||_|_ytjdjjdd|_ Wnt t fk rpYnX|S)NzDNamedTuple('Name', [(f0, t0), (f1, t1), ...]); each t must be a typecsg|]\}}|t|fqSrC)r})rnr)rrCrD Asz!_make_nmtuple..cSsg|] \}}|qSrCrC)rr]rrCrCrDr^BsrrA__main__) rJ namedtuple OrderedDictr# _field_typesr>rrr'rdr r)rWrnm_tplrC)rrD _make_nmtuple?srdrUr^rq__getnewargs___fields_field_defaultsrb_make_replace_asdict_sourcerdrAr@r#cseZdZfddZZS)NamedTupleMetac s|jddrtj||||Sts*td|jdi}t||j}g}i}xP|D]H}||krz||} |j| | ||<qR|rRtdj|dj |j dqRWt j ||j_ t||j_||_xD|D]<} | tkrtd| q| tko| |jkrt|| || qW|S) NrOFz= 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)]) TNcKs:|rt rtd|dkr$|j}n |r0tdt||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)rnrPr(rd)r[rrZfieldskwargsrCrCrDrUs  zNamedTuple.__new__)N)rArdr@rgrOrUrCrCrCrDr3yscCsdd}||_||_|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 cSs|S)NrC)rBrCrCrDnew_typeszNewType..new_type)rAZ __supertype__)rWrrvrCrCrDr8sFc@seZdZdZfZeedddZeedddZe dddd Z e e dd d Z e e dd d Ze ddddZe e dddZe d7e edddZe e dddZe d9e edddZe d;e eedddZe dIOaGeneric 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<cCsdS)NrC)r[rCrCrDmodeszIO.modecCsdS)NrC)r[rCrCrDrWszIO.nameNcCsdS)NrC)r[rCrCrDcloseszIO.closecCsdS)NrC)r[rCrCrDclosedsz IO.closedcCsdS)NrC)r[rCrCrDfilenosz IO.filenocCsdS)NrC)r[rCrCrDflushszIO.flushcCsdS)NrC)r[rCrCrDisattysz IO.isattyrK)r]r<cCsdS)NrC)r[r]rCrCrDreadszIO.readcCsdS)NrC)r[rCrCrDreadablesz IO.readable)limitr<cCsdS)NrC)r[rrCrCrDreadlinesz IO.readline)hintr<cCsdS)NrC)r[rrCrCrD readlinessz IO.readlinesr)offsetwhencer<cCsdS)NrC)r[rrrCrCrDseekszIO.seekcCsdS)NrC)r[rCrCrDseekable sz IO.seekablecCsdS)NrC)r[rCrCrDtell szIO.tell)sizer<cCsdS)NrC)r[rrCrCrDtruncate sz IO.truncatecCsdS)NrC)r[rCrCrDwritable sz IO.writable)sr<cCsdS)NrC)r[rrCrCrDwrite szIO.write)linesr<cCsdS)NrC)r[rrCrCrD writelines sz IO.writelinesz IO[AnyStr]cCsdS)NrC)r[rCrCrDrM sz IO.__enter__cCsdS)NrC)r[rorrPrCrCrDrQ sz IO.__exit__r)rr)rr)r)r)N) rArdr@rgrqrrmrxrWrryrrzr>r{r|r}r5r~rrr0rrrrrrrrrMrQrCrCrCrDrwsT rwc@sBeZdZdZfZeeeefe dddZ eddddZ dS) BinaryIOz5Typed version of the return of open() in binary mode.)rr<cCsdS)NrC)r[rrCrCrDr) szBinaryIO.write)r<cCsdS)NrC)r[rCrCrDrM- szBinaryIO.__enter__N) rArdr@rgrqrrrD bytearrayr>rrMrCrCrCrDr$ s rc@seZdZdZfZeedddZeedddZ ee edddZ ee dd d Z eedd d Zeddd dZdS)TextIOz3Typed version of the return of open() in text mode.)r<cCsdS)NrC)r[rCrCrDbuffer7 sz TextIO.buffercCsdS)NrC)r[rCrCrDencoding; szTextIO.encodingcCsdS)NrC)r[rCrCrDerrors? sz TextIO.errorscCsdS)NrC)r[rCrCrDline_bufferingC szTextIO.line_bufferingcCsdS)NrC)r[rCrCrDnewlinesG szTextIO.newlinescCsdS)NrC)r[rCrCrDrMK szTextIO.__enter__N)rArdr@rgrqrrrrmrrrrrr rrrMrCrCrCrDr2 src@s&eZdZdZdddgZeZeZeZdS)ioz)Wrapper namespace for IO generic classes.rwrrN)rArdr@rg__all__rwrrrCrCrCrDrP s  rz.ioPatternrcCs|jS)N)pattern)rrCrCrD^ srMatchcCs|jjS)N)rer)mrCrCrDr` sc@s eZdZdZddgZeZeZdS)rz&Wrapper namespace for re type aliases.rrN)rArdr@rgrrrrCrCrCrDrc srz.re)rr)NN)NN)rrW)rr) rUr^rqrerfrgrbrhrirjrk)rdrAr@r#)rrrrJ contextlibrrZ stdlib_rer>rcollections.abcZcollections_abc ImportErrorr?_collections_abcrrr rorr^__str__rmrQrrErMrNrHrIrGrFrcrrar}rSrr rZNoReturnrrrrrrrrrDr5rrrrrrrrrrrrrrrr r rrr rnrrr rr r6r!rBuiltinFunctionType MethodTyper)r*r7r9r:r0r;r1rrrr8rr9r:r;rrr*r)r(r'r&r+r%r#rrIr1rr!rrr"r r>rrr0rKr-rrr2rrrr$rLrrUrVexecrr.rXr/r,rYr4rZ GeneratorTyper[r\rrdrnrorprlr3r8r<r=rwrrrrAr&ryrmatchrrCrCrCrDs   *%5C  W      !)    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