[issue19787] Fix PyThread_set_key_value() strange behaviour

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


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title: tracemalloc: set_reentrant() should not have to call PyThread_delete_key() -> Fix PyThread_set_key_value() strange behaviour

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19787>
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