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NzAmbiguous dispatch: {} or {})r keysrrrrr)rPregistryrmatchtr&r&r' _find_impls    r%csddl}ddl}i|dfddddd fdd fd d }t|d d |t<|_|_||_j |_ t |||S)akSingle-dispatch generic function decorator. Transforms a function into a generic function, which can have different behaviours depending upon the type of its first argument. The decorated function acts as the default implementation, and additional implementations can be registered using the register() attribute of the generic function. rNc sxdurt}|kr|z|}W|Sty;z|}Wnty3t|}Ynw||<Y|Sw)zgeneric_func.dispatch(cls) -> Runs the dispatch algorithm to return the best available implementation for the given *cls* registered on *generic_func*. N)rrKeyErrorr%)rP current_tokenimpl) cache_tokendispatch_cacher"r&r'dispatch2s"     z singledispatch..dispatchcSst|to t|t SrK)rr+rrOr&r&r'_is_valid_dispatch_typeIsz/singledispatch.._is_valid_dispatch_typecsr|durfddSn?|durtddtdi}|s,tdd}d d lm}tt||\}sOtd |d d|<dur_td r_t |S)zgeneric_func.register(cls, func) -> func Registers a new implementation for the given *cls* on a *generic_func*. Ncs |SrKr&)f)rPregisterr&r'rUrz2singledispatch..register..z(Invalid first argument to `register()`. z is not a class.rz(Invalid first argument to `register()`: zS. 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Supports wrapping existing descriptors and handles non-descriptor callables as instance methods. cCs4t|st|dst|dt||_||_dS)Nrz is not callable or a descriptor)rsrtrir dispatcherror.ror&r&r'r[s  zsingledispatchmethod.__init__NcCs|jj||dS)zgeneric_method.register(cls, func) -> func Registers a new implementation for the given *cls* on a *generic_method*. r)r9r.)r.rPmethodr&r&r'r.szsingledispatchmethod.registercs0fdd}j|_j|_t|j|S)Ncs(j|dj}||i|Sr\)r9r+rxr)rpkwargsr;rPrYr.r&r'rsz-singledispatchmethod.__get__.._method)rr.rro)r.rYrPrr&r=r'rs  zsingledispatchmethod.__get__cCrrrrr&r&r'rrz)singledispatchmethod.__isabstractmethod__rK) rrrrr[r.rrrr&r&r&r'r s   r c@s.eZdZddZddZdddZeeZdS) rcCs ||_d|_|j|_t|_dSrK)roattrnamerrrr:r&r&r'r[s zcached_property.__init__cCs:|jdur ||_dS||jkrtd|jd|ddS)Nz?Cannot assign the same cached_property to two different names (z and z).)r>ri)r.ownernamer&r&r' __set_name__s   zcached_property.__set_name__Nc Cs|dur|S|jdurtdz|j}Wnty-dt|jd|jd}t|dw||jt}|tur|jB||jt}|turn| |}z|||j<Wn!tymdt|jd|jd}t|dwWd|SWd|S1swY|S)NzGCannot use cached_property instance without calling __set_name__ on it.zNo '__dict__' attribute on z instance to cache z property.zThe '__dict__' attribute on z7 instance does not support item assignment for caching ) r>rirrr+rr _NOT_FOUNDrro)r.instancer?rmsgvalr&r&r'rsL            zcached_property.__get__rK) rrrr[rArrrrr&r&r&r'rs  r)rFrK)s                       A J  .t -*f(