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weakref
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will be returned ref() actually defines a type, ReferenceType, that can be used for type-checking and subclasses
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proxy(object[, callback])
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Creates a proxy using a weak reference to objectThe returned proxy object is really a wrapper around the original object that provides access to its attributes and methods As long as the original object exists, manipulation of the proxy object will transparently mimic the behavior of the underlying object On the other hand, if the original object has been destroyed, operations on the proxy will raise a weakrefReferenceError to indicate that the object no longer exists callback is a callback function with the same meaning as for the ref() functionThe type of a proxy object is either ProxyType or CallableProxyType, depending on whether or not the original object is callable
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getweakrefcount(object)
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Returns the number of weak references and proxies that refer to object
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getweakrefs(object)
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Returns a list of all weak reference and proxy objects that refer to object
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WeakKeyDictionary([dict])
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Creates a dictionary in which the keys are referenced weaklyWhen there are no more strong references to a key, the corresponding entry in the dictionary is automatically removed If supplied, the items in dict are initially added to the returned WeakKeyDictionary object Because only certain types of objects can be weakly referenced, there are numerous restrictions on acceptable key values In particular, built-in strings cannot be used as weak keys However, instances of user-defined classes that define a _ _hash_ _() method can be used as keys An instance of WeakKeyDictionary has two methods, iterkeyrefs() and keyrefs(), that return the weak key references
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Creates a dictionary in which the values are referenced weaklyWhen there are no more strong references to a value, corresponding entries in the dictionary will be discarded If supplied, the entries in dict are added to the returned WeakValueDictionary An instance of WeakValueDictionary has two methods, itervaluerefs() and valuerefs(), that return the weak value references
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ProxyTypes
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This is a tuple (ProxyType, CallableProxyType) that can be used for testing if an object is one of the two kinds of proxy objects created by the proxy() function for example, isinstance(object, ProxyTypes)
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Example
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One application of weak references is to create caches of recently computed results For instance, if a function takes a long time to compute a result, it might make sense to cache these results and to reuse them as long as they are still in use someplace in the application For example:
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_resultcache = { } def foocache(x): if resultcachehas_key(x): r = _resultcache[x]() # Get weak ref and dereference it if r is not None: return r r = foo(x) _resultcache[x] = weakrefref(r) return r
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Notes
Only class instances, functions, methods, sets, frozen sets, files, generators, type objects, and certain object types defined in library modules (for example, sockets, arrays, and regular expression patterns) support weak references Built-in functions and most built-in types such as lists, dictionaries, strings, and numbers cannot be used If iteration is ever used on a WeakKeyDictionary or WeakValueDictionary, great care should be taken to ensure that the dictionary does not change size because this may produce bizarre side effects such as items mysteriously disappearing from the dictionary for no apparent reason If an exception occurs during the execution of a callback registered with ref() or proxy(), the exception is printed to standard error and ignored Weak references are hashable as long as the original object is hashable Moreover, the weak reference will maintain its hash value after the original object has been deleted, provided that the original hash value is computed while the object still exists Weak references can be tested for equality but not for ordering If the objects are still alive, references are equal if the underlying objects have the same value Otherwise, references are equal if they are the same reference