[issue477863] Print warning at shutdown if gc.garbage not empty

[Antoine Pitrou]

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

Displaying the full list may be unwieldy if it's very large. Instead, we could by default display the following kind of message:

Python warning: 5 uncollectable objects remaining at interpreter shutdown. Use gc.DEBUG_UNCOLLECTABLE to list them.

And list gc.garbage only if gc.DEBUG_UNCOLLECTABLE is defined.

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versions:  -Python 2.7

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