[issue29564] ResourceWarning: suggest to enable tracemalloc in the message

[STINNER Victor]

STINNER Victor added the comment:

To be clear: warnings should only suggest to enable tracemalloc if tracemalloc.is_tracing() is False.

It is possible to tracemalloc is tracing, but failed (for different reasons) to track where the memory of the resource was allocated.

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title: ResourceWarning tracking is attaching incorrect file:position to unclosed socket -> ResourceWarning: suggest to enable tracemalloc in the message

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<http://bugs.python.org/issue29564>
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