[issue6242] Fix reference leak in io.StringIO

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

It seems wrong to call PyObject_ClearWeakRefs() in stringio_clear().
Weakrefs should only be notified when the object is deallocated, not
cleared.
Besides, you should add a test for this, so that the leak can be spotted
with regrtest -R.

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nosy: +pitrou

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<http://bugs.python.org/issue6242>
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