Issue1803227

Jython allowed to creat Weak ref for List , Tuple and Dict object ...

And  does not work properly once we create proxy object to it...

Python does not  support Weak Ref for List ,Tuple and Dict Objects..

i am pasting some work around here...

Python behavior :-

>>> import weakref  as w
>>> a=(1,2,3,4)
>>> b=w.proxy(a)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot create weak reference to 'tuple' object

jython behavior :-

>>> import weakref  as w
>>> a=(1,2,3,4)
>>> b=w.proxy(a)
>>> b
<weakref 1 to 'tuple' object 2>
>>> a=None
>>> b
<weakref 1 to 'tuple' object 2>

:- here b sud be None Type because a is None..
but it does not work at all because in java it is depends on the mood of Garbage collector.  :)

Everything is at the mercy of the garbage collector in Jython, not just weak references.  Python objects won't be finalized immediately  on leaving a scope like they are in CPython either.  That garbage collection allows us to have weak refs to types CPython doesn't support is a feature, not a bug.