Roundup Robot <devn...@psf.upfronthosting.co.za> added the comment: New changeset 5c52e7c6d868 by Antoine Pitrou in branch '2.7': Issue #13521: dict.setdefault() now does only one lookup for the given key, making it "atomic" for many purposes. http://hg.python.org/cpython/rev/5c52e7c6d868
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