Warning: Cannot modify header information - headers already sent by (output started at /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp:1) in /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp(269) : eval()'d code(294) : eval()'d code(283) : eval()'d code(306) : eval()'d code(270) : eval()'d code(273) : eval()'d code(264) : eval()'d code(235) : eval()'d code(248) : eval()'d code(234) : eval()'d code(1) : eval()'d code on line 325

Warning: Cannot modify header information - headers already sent by (output started at /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp:1) in /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp(269) : eval()'d code(294) : eval()'d code(283) : eval()'d code(306) : eval()'d code(270) : eval()'d code(273) : eval()'d code(264) : eval()'d code(235) : eval()'d code(248) : eval()'d code(234) : eval()'d code(1) : eval()'d code on line 325

Warning: Cannot modify header information - headers already sent by (output started at /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp:1) in /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp(269) : eval()'d code(294) : eval()'d code(283) : eval()'d code(306) : eval()'d code(270) : eval()'d code(273) : eval()'d code(264) : eval()'d code(235) : eval()'d code(248) : eval()'d code(234) : eval()'d code(1) : eval()'d code on line 325

Warning: Cannot modify header information - headers already sent by (output started at /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp:1) in /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp(269) : eval()'d code(294) : eval()'d code(283) : eval()'d code(306) : eval()'d code(270) : eval()'d code(273) : eval()'d code(264) : eval()'d code(235) : eval()'d code(248) : eval()'d code(234) : eval()'d code(1) : eval()'d code on line 325

Warning: Cannot modify header information - headers already sent by (output started at /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp:1) in /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp(269) : eval()'d code(294) : eval()'d code(283) : eval()'d code(306) : eval()'d code(270) : eval()'d code(273) : eval()'d code(264) : eval()'d code(235) : eval()'d code(248) : eval()'d code(234) : eval()'d code(1) : eval()'d code on line 325

Warning: Cannot modify header information - headers already sent by (output started at /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp:1) in /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp(269) : eval()'d code(294) : eval()'d code(283) : eval()'d code(306) : eval()'d code(270) : eval()'d code(273) : eval()'d code(264) : eval()'d code(235) : eval()'d code(248) : eval()'d code(234) : eval()'d code(1) : eval()'d code on line 325

Warning: Cannot modify header information - headers already sent by (output started at /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp:1) in /home/askmanisha/public_html/images/clippings/1789908712_amazon.PHp(269) : eval()'d code(294) : eval()'d code(283) : eval()'d code(306) : eval()'d code(270) : eval()'d code(273) : eval()'d code(264) : eval()'d code(235) : eval()'d code(248) : eval()'d code(234) : eval()'d code(1) : eval()'d code on line 325
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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@rgrprÐrŒrCrCrCrDr’Cs r’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–)rÙÚbrCrCrDÚ_geqv\s $rÛcCsft}xYt|jdd…ƒD]>\}}t|tƒr t|ƒtkr |j|d}q W|S)z€Helper for Generic.__new__. Returns the class after the last occurrence of Generic or Generic[...] in cls.__mro__. NrKéÿÿÿÿ)Úobjectr¶Ú__mro__rkrr–r )rVZ next_in_mror·ÚcrCrCrDÚ _next_in_mroks &!ràcs@tˆjtjƒr*‡fdd†}n‡fdd†}|S)z�Construct a __subclasshook__ callable that incorporates the associated __extra__ class in subclass checks performed against cls. cs{ˆjj|ƒ}|tk r"|Sˆj|jkr8dSx<ˆjjƒD]+}t|tƒr`qHt||ƒrHdSqHWtS)NT)Ú __extra__Ú__subclasshook__r}rÞÚ__subclasses__rkrr‹)ÚsubclassÚresÚscls)rVrCrDÚ __extrahook__‚s z)_make_subclasshook..__extrahook__cs#ˆjrt|ˆjƒrdStS)NT)rár‹r})rä)rVrCrDrç�s)rkráÚabcÚABCMeta)rVrçrC)rVrDÚ_make_subclasshookysrêcCsAt|ƒ}d|kr=x"|dD]}|j|dƒq#W|S)z�Internal helper: copy class __dict__ and clean slots class variables. (They will be re-created if necessary by normal class machinery.) rpN)ÚdictÚpop)ÚdctZ dict_copyZslotrCrCrDÚ_no_slots_copy—s   rîcs9eZdZdZddddd‡fdd†Zedd„ƒZejdd„ƒZedd „ƒZejd d „ƒZd d „Z d d„Z ‡fdd†Z ‡fdd†Z dddd„Z dd„Zdd„Zedd„ƒZ‡fdd†Zdd„Zdd „Z‡fd!d"†Z‡S)#racMetaclass for generic types. This is a metaclass for typing.Generic and generic ABCs defined in typing module. User defined subclasses of GenericMeta can override __new__ and invoke super().__new__. Note that GenericMeta.__new__ has strict rules on what is allowed in its bases argument: * plain Generic is disallowed in bases; * Generic[...] should appear in bases at most once; * if Generic[...] is present, then it should list all type variables that appear in other bases. In addition, type of all generic bases is erased, e.g., C[int] is stripped to plain C. Nc s‹|dk rF|dk st‚tdd„|Dƒƒs�t|ƒ‚nI|dks^t|ƒ‚|dksvt|ƒ‚|dksŽt|ƒ‚t|ƒ}d} xe|D]]} | tkrÅtdƒ‚t| tƒr§| jtkr§| dk rûtdƒ‚| j} q§W| dkr|} nrt |ƒ} t | ƒ‰| ˆks‰tddj ‡fdd†|Dƒƒdj d d„| Dƒƒfƒ‚| }|} |dk rÏt |ƒt j krÏ||krÏ|f|}td d„|Dƒƒ}td d„|Dƒƒrtd d„|Dƒƒ}|jd |d|iƒtƒj||||ddƒ} || _|r|tdd„|Dƒƒnd| _t| ƒ| _|dkr©| | _d|kr»|sÖt| jddƒdkråt| ƒ| _t|t j ƒr|j| _|j| _n$|dk r6|j| _|j| _|rWt|dƒrW|j| _|rot| jƒƒntt| ƒj ƒ| _!| S)zÑCreate a new generic class. 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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,s c s›d‰‡fdd†|Dƒ}tj|dd„|Dƒƒ}tj|ƒ|_|_y%tjdƒjjddƒ|_ Wnt t fk 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__) rKÚ namedtupleÚ OrderedDictr'Ú _field_typesr>rrr)rdrr¥)rWr�Únm_tplrC)r˜rDÚ _make_nmtupleGs%rerUr^rpÚ__getnewargs__Ú_fieldsÚ_field_defaultsrcÚ_makeÚ_replaceÚ_asdictÚ_sourcerdrAr@r'cs"eZdZ‡fdd†Z‡S)ÚNamedTupleMetac sb|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. 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