Rick van Hattem
43 lines
1.1 KiB
ReStructuredText
43 lines
1.1 KiB
ReStructuredText
>>> import weakref
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>>> weakref.ref(dict(a=123))
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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TypeError: cannot create weak reference to 'dict' object
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>>> weakref.ref([1, 2, 3])
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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TypeError: cannot create weak reference to 'list' object
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>>> weakref.ref('test')
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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TypeError: cannot create weak reference to 'str' object
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>>> weakref.ref(b'test')
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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TypeError: cannot create weak reference to 'bytes' object
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>>> a = weakref.WeakValueDictionary(a=123)
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Traceback (most recent call last):
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...
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TypeError: cannot create weak reference to 'int' object
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>>> class CustomDict(dict):
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... pass
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>>> weakref.ref(CustomDict())
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<weakref at 0x...; dead>
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>>> class SomeClass:
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... def __init__(self, name):
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... self.name = name
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>>> a = SomeClass('a')
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>>> b = weakref.proxy(a)
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>>> b.name
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'a'
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>>> del a
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>>> b.name
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Traceback (most recent call last):
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...
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ReferenceError: weakly-referenced object no longer exists
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