[issue33603] Subprocess Thread handles grow with each call and aren't released until script ends

[GranPrego]

GranPrego <josephdeller at googlemail.com> added the comment:

Process explorer is showing the handles as belonging to the python executable. I can see the cmd process start,then the executable which terminates cleanly.  I can see thread handles appearing under the python process, with some terminating, but more green than red, hence the increase.  I can post a screenshot tomorrow. Thanks

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33603>
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