[Python-Dev] Assigning to __debug__

[Tim Peters]

[Guido]
> In any case, YOU SHOULD NEVER INTRODUCE VARIABLES USING THE
> __UNDERSCORE__ CONVENTION!

[/F]
> is the "__version__" convention documented somewhere?

In the Language Reference manual, section "Reserved classes of identifiers",
middle line of the table.  It would benefit from more words, though (it just
says "System-defined name" now, and hostile users are known to have trouble
telling themselves apart from "the system" <wink>).