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Entries in the dictionary will be discarded when no strong
reference to the value exists anymore
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z WeakValueDictionary.__getitem__c C s! | j r | j � | j | =d S)N)r6 rH rA )r r8 r r r � __delitem__� s
z WeakValueDictionary.__delitem__c C s | j r | j � t | j � S)N)r6 rH r> rA )r r r r �__len__� s
zWeakValueDictionary.__len__c C sJ | j r | j � y | j | � } Wn t k
r? d SYn X| d k S)NF)r6 rH rA rI )r r8 rJ r r r � __contains__� s
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z WeakValueDictionary.__setitem__c C s_ | j r | j � t � } x< | j j � D]+ \ } } | � } | d k r, | | | <q, W| S)N)r6 rH r rA �items)r �newr8 r9 rJ r r r �copy� s
zWeakValueDictionary.copyc C s{ d d l m } | j r# | j � | j � } xE | j j � D]4 \ } } | � } | d k r? | | | | | � <q? W| S)Nr )�deepcopy)rV rW r6 rH r) rA rT )r �memorW rU r8 r9 rJ r r r � __deepcopy__� s
z WeakValueDictionary.__deepcopy__Nc C s^ | j r | j � y | j | } Wn t k
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zWeakValueDictionary.itemsc
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zWeakValueDictionary.keysc c s= | j r | j � t | � � | j j � Ed HWd QRXd S)a� Return an iterator that yields the weak references to the values.
The references are not guaranteed to be 'live' at the time
they are used, so the result of calling the references needs
to be checked before being used. This can be used to avoid
creating references that will cause the garbage collector to
keep the values around longer than needed.
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setdefault s
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zWeakValueDictionary.updatec C s& | j r | j � t | j j � � S)a~ Return a list of weak references to the values.
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callback object can use the 'key' attribute of a KeyedRef instead
of getting a reference to the key from an enclosing scope.
r8 c C s" t j | | | � } | | _ | S)N)r r" r8 )r! �obr r8 r r r r r" N s zKeyedRef.__new__c s t � j | | � d S)N)r' rE )r rj r r8 )r) r r rE S s zKeyedRef.__init__)r8 )r. r/ r0 r1 r2 r" rE r r )r) r rQ B s rQ c @ s e Z d Z d Z d d d � Z d d � Z d d � Z d d
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associate additional data with an object owned by other parts of
an application without adding attributes to those objects. This
can be especially useful with objects that override attribute
accesses.
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zWeakKeyDictionary.valuesc C s
t | j � S)az Return a list of weak references to the keys.
The references are not guaranteed to be 'live' at the time
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to be checked before being used. This can be used to avoid
creating references that will cause the garbage collector to
keep the keys around longer than needed.
)rf rA )r r r r �keyrefs� s
zWeakKeyDictionary.keyrefsc C sH d | _ x8 | j j � \ } } | � } | d k r | | f Sq Wd S)NT)rk rA ra )r r8 rR rJ r r r ra � s zWeakKeyDictionary.popitemc G s" d | _ | j j t | � | � S)NT)rk rA rF r )r r8 rC r r r rF � s zWeakKeyDictionary.popc C s | j j t | | j � | � S)N)rA rb r r? )r r8 rZ r r r rb � s z WeakKeyDictionary.setdefaultc K s� | j } | d k ri t | d � s6 t i � | � } x0 | j � D]" \ } } | | t | | j � <qC Wt | � r� | j | � d S)NrT )rA rc r! rT r r? r> rB )r re rd r< r8 rR r r r rB � s zWeakKeyDictionary.update)r. r/ r0 r1 rE rH rn rL rK rM rP rS rV rh rY r[ rN rT r^ ri r_ ro ra rF rb rB r r r r r W s.
c @ s� e Z d Z d Z f Z i Z d Z e j � Z d Z
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� Z e d d � � Z e d d � � Z e j d d � � Z d d � Z e d d � � Z e d d � � Z d S)r a Class for finalization of weakrefable objects
finalize(obj, func, *args, **kwargs) returns a callable finalizer
object which will be called when obj is garbage collected. The
first time the finalizer is called it evaluates func(*arg, **kwargs)
and returns the result. After this the finalizer is dead, and
calling it just returns None.
When the program exits any remaining finalizers for which the
atexit attribute is true will be run in reverse order of creation.
By default atexit is true.
Fc @ s e Z d Z d Z d S) zfinalize._Info�weakrefr& rC rd �atexit�indexN)rp r& rC rd rq rr )r. r/ r0 r2 r r r r �_Info s rs c O s� | j s. d d l } | j | j � d t _ | j � } t | | � | _ | | _ | | _ | pg d | _
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zfinalize.__init__Nc C sE | j j | d � } | rA | j rA | j | j | j p= i � Sd S)zZIf alive then mark as dead and return func(*args, **kwargs);
otherwise return NoneN)ry rF � _shutdownr& rC rd )r �_r{ r r r r( s zfinalize.__call__c C sh | j j | � } | o! | j � } | d k rd | j j | d � rd | | j | j | j p` i f Sd S)z^If alive then mark as dead and return (obj, func, args, kwargs);
otherwise return NoneN)ry r[ rp rF r& rC rd )r r{ r% r r r �detach& s !zfinalize.detachc C sS | j j | � } | o! | j � } | d k rO | | j | j | j pK i f Sd S)zMIf alive then return (obj, func, args, kwargs);
otherwise return NoneN)ry r[ rp r& rC rd )r r{ r% r r r �peek. s z
finalize.peekc C s
| | j k S)zWhether finalizer is alive)ry )r r r r �alive6 s zfinalize.alivec C s% | j j | � } t | � o$ | j S)z*Whether finalizer should be called at exit)ry r[ �boolrq )r r{ r r r rq ; s zfinalize.atexitc C s+ | j j | � } | r' t | � | _ d S)N)ry r[ r� rq )r rR r{ r r r rq A s c C s� | j j | � } | o! | j � } | d k rM d t | � j t | � f Sd t | � j t | � t | � j t | � f Sd S)Nz<%s object at %#x; dead>z!<%s object at %#x; for %r at %#x>)ry r[ rp r! r. rO )r r{ r% r r r rP G s zfinalize.__repr__c C sC d d � | j j � D� } | j d d d � � d d � | D� S)Nc S s+ g | ]! \ } } | j r | | f � q Sr )rq )rl �f�ir r r rm S s z-finalize._select_for_exit.<locals>.<listcomp>r8 c S s | d j S)Nr4 )rr )�itemr r r �<lambda>T s z+finalize._select_for_exit.<locals>.<lambda>c S s g | ] \ } } | � q Sr r )rl r� r� r r r rm U s )ry rT �sort)r# �Lr r r �_select_for_exitP s zfinalize._select_for_exitc C s� d } z� | j r� d d l } | j � r: d } | j � d } x� | d k sX t j rm | j � } d t _ | st P| j � } y | � Wn% t k
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