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� z fc @ s} d Z d d l Z d d l m Z d d d � � YZ e e � � Z d � Z d e f d � � YZ d e f d � � YZ d S( s3 Abstract Base Classes (ABCs) according to PEP 3119.i����N( t WeakSett _Cc B s e Z RS( ( t __name__t __module__( ( ( s /usr/lib64/python2.7/abc.pyR s c C s t | _ | S( s� A decorator indicating abstract methods. Requires that the metaclass is ABCMeta or derived from it. A class that has a metaclass derived from ABCMeta cannot be instantiated unless all of its abstract methods are overridden. The abstract methods can be called using any of the normal 'super' call mechanisms. Usage: class C: __metaclass__ = ABCMeta @abstractmethod def my_abstract_method(self, ...): ... ( t Truet __isabstractmethod__( t funcobj( ( s /usr/lib64/python2.7/abc.pyt abstractmethod s t abstractpropertyc B s e Z d Z e Z RS( s/ A decorator indicating abstract properties. Requires that the metaclass is ABCMeta or derived from it. A class that has a metaclass derived from ABCMeta cannot be instantiated unless all of its abstract properties are overridden. The abstract properties can be called using any of the normal 'super' call mechanisms. Usage: class C: __metaclass__ = ABCMeta @abstractproperty def my_abstract_property(self): ... This defines a read-only property; you can also define a read-write abstract property using the 'long' form of property declaration: class C: __metaclass__ = ABCMeta def getx(self): ... def setx(self, value): ... x = abstractproperty(getx, setx) ( R R t __doc__R R ( ( ( s /usr/lib64/python2.7/abc.pyR $ s t ABCMetac B sD e Z d Z d Z d � Z d � Z d d � Z d � Z d � Z RS( si Metaclass for defining Abstract Base Classes (ABCs). Use this metaclass to create an ABC. An ABC can be subclassed directly, and then acts as a mix-in class. You can also register unrelated concrete classes (even built-in classes) and unrelated ABCs as 'virtual subclasses' -- these and their descendants will be considered subclasses of the registering ABC by the built-in issubclass() function, but the registering ABC won't show up in their MRO (Method Resolution Order) nor will method implementations defined by the registering ABC be callable (not even via super()). i c C s� t t | � j | | | | � } t d � | j � D� � } xb | D]Z } xQ t | d t � � D]: } t | | d � } t | d t � r` | j | � q` q` WqD Wt | � | _ t � | _ t � | _ t � | _ t j | _ | S( Nc s s- | ]# \ } } t | d t � r | Vq d S( R N( t getattrt False( t .0t namet value( ( s /usr/lib64/python2.7/abc.pys <genexpr>Y s t __abstractmethods__R ( t superR t __new__t sett itemsR t NoneR t addt frozensetR R t _abc_registryt _abc_cachet _abc_negative_cachet _abc_invalidation_countert _abc_negative_cache_version( t mclsR t basest namespacet clst abstractst baseR ( ( s /usr/lib64/python2.7/abc.pyR V s ! c C s{ t | t t j f � s' t d � � n t | | � r: d St | | � rX t d � � n | j j | � t j d 7_ d S( s& Register a virtual subclass of an ABC.s Can only register classesNs' Refusing to create an inheritance cyclei ( t isinstancet typet typest ClassTypet TypeErrort issubclasst RuntimeErrorR R R R ( R t subclass( ( s /usr/lib64/python2.7/abc.pyt registeri s c C s� | d | j | j f IJ| d t j IJxR t | j j � � D]; } | j d � rA t | | � } | d | | f IJqA qA Wd S( s' Debug helper to print the ABC registry.s Class: %s.%ss Inv.counter: %st _abc_s %s: %rN( R R R R t sortedt __dict__t keyst startswithR ( R t fileR R ( ( s /usr/lib64/python2.7/abc.pyt _dump_registryw s c C s� t | d d � } | d k r1 | | j k r1 t St | � } | t k rR | } n | | k sj | d k r� | j t j k r� | | j k r� t S| j | � S| j | � p� | j | � S( s' Override for isinstance(instance, cls).t __class__N( R R R R R$ t _InstanceTypeR R R R R t __subclasscheck__( R t instanceR* t subtype( ( s /usr/lib64/python2.7/abc.pyt __instancecheck__� s c C sa | | j k r t S| j t j k r@ t � | _ t j | _ n | | j k rS t S| j | � } | t k r� t | t � s� t � | r� | j j | � n | j j | � | S| t | d d � k r� | j j | � t Sx4 | j D]) } t | | � r� | j j | � t Sq� Wx7 | j � D]) } t | | � r | j j | � t Sq W| j j | � t S( s' Override for issubclass(subclass, cls).t __mro__( ( R R R R R R R R t __subclasshook__t NotImplementedR# t boolt AssertionErrorR R R R( t __subclasses__( R R* t okt rclst scls( ( s /usr/lib64/python2.7/abc.pyR5 � s6 N( R R R R R R+ R R2 R8 R5 ( ( ( s /usr/lib64/python2.7/abc.pyR A s ( ( R R% t _weakrefsetR R R$ R4 R t propertyR R ( ( ( s /usr/lib64/python2.7/abc.pyt <module> s
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