On Nov 8, 2010, at 4:50 PM, Guido van Rossum wrote: > On Mon, Nov 8, 2010 at 3:55 PM, Glyph Lefkowitz <gl...@twistedmatrix.com> > wrote: >> This seems like a pretty clear case of "practicality beats purity". Not >> only has nobody complained about deprecatedModuleAttribute, but there are >> tons of things which show up in sys.modules that aren't modules in the sense >> of 'instances of ModuleType'. The Twisted reactor, for example, is an >> instance, and we've been doing *that* for about 10 years with no complaints. > > But the Twisted universe is only a subset of the Python universe. The > Python stdlib needs to move more carefully.
While this is true, I think the Twisted universe generally represents a particularly conservative, compatibility-conscious area within the Python universe (multiverse?). I know of several Twisted users who regularly upgrade to the most recent version of Twisted without incident, but can't move from Python 2.4->2.5 because of compatibility issues. That's not to say that there are no areas within the larger Python ecosystem that I'm unaware of where putting non-module-objects into sys.modules would cause issues. But if it were a practice that were at all common, I suspect that we would have bumped into it by now.
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