Does this mean that the implementation of Stackless 3.0 could be acceptable to integrate into CPython 2.5? It would be absolutely wonderful to have those capabilities available in the standard distribution!
Let's not get too excited about this possibility. Before something is accepted into the language its semantics must be specified exactly and clearly. Last time this was proposed, the Stackless semantics were extremely murky, with lots of implementation-specific exceptions. Another requirement is that other Python implementations, like Jython and IronPython (Jim Hugunin's C# port) can also support these semantics. Until these conditions are met, Stackless is stuck in the fringe. --Guido van Rossum (home page: http://www.python.org/~guido/)