Barry Warsaw wrote: > I've always understood the rules on > double-underscore names to mean that Python reserves the use of those names > for its own purposes, and is free to break your code if you define your own. > That's very different than saying it's forbidden to use double-underscore > names for your own purposes or assign to them, which is I think what's going > on with the sys.__debug__ example. I don't see that there's any difference. Once upon a time, __debug__ wasn't special, and someone decided to use it for their own purposes. Then Guido decided to make it special, and broke their code, which is within the rules as you just stated them. The rule doesn't say anything about what *kinds* of breakage are allowed, so anything goes, including making it impossible to assign to the name any more. -- Greg
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