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Message: [QUOTE="Ken Seehart, post: 4204919"] This is documented in python 3, so I would expect it to be stable (until python 4, that is) [URL]http://docs.python.org/py3k/whatsnew/3.0.html#operators-and-special-methods[/URL] [URL]http://docs.python.org/py3k/library/inspect.html#types-and-members[/URL] The f.__defaults__ attribute was previously known as f.func_defaults (in python 2.x), which has been around, documented and stable for quite a while. So it's probably just as safe as any other monkey patching technique. :) Best of luck, Ken [/QUOTE]