14.3.3.10 Cleanup
OptionParser instances have several cyclic references. This should not
be a problem for Python's garbage collector, but you may wish to break
the cyclic references explicitly by calling destroy() on your
OptionParser once you are done with it. This is particularly useful in
long-running applications where large object graphs are reachable from
your OptionParser.
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Release 2.5, documentation updated on 19th September, 2006.