Message 294910 - Python tracker

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Neil Schemenauer: "Well, I just spent a couple of hours debugging a problem caused by this issue."

Did you get any ResourceWarning? You need to run python3 with -Wd to see them.

By the way, I enhanced ResourceWarning in Python 3.6: if you enable tracemalloc, these warnings now log the traceback where the leakded resource was created ;-)
https://docs.python.org/dev/whatsnew/3.6.html#warnings