Why is he forgetting about concurrency? There seem to be plenty of tools for managing concurrency right now in Python, and they are working fine for me.
What languages are you considering that have a better story here? Note that better story has to mean more than "syntax-level support" -- I run highly concurrent services in Python right now using Twisted without language level support, and it's not always obvious in which ways language level support would make things nicer in ways that aren't already implemented (e.g generators + @inlineCallbacks).
2. You can't parallelize computation if it's written in Python. (Yeah, yeah, concurrency is different from parallelism, but there is a lot of overlap.) Even if it's written in a different language, the granularity is constrained due to the GIL.
1. I don't, but that's an entirely different story.
2. Sure I can :) Usually this means deferToThreading with things that release the GIL, sometimes it means multiple processes, both of which have quite good tools in Python. Not that they can't afford to be better, but I've never thought "man, the GIL is really holding me back now" -- despite having dealt with projects that are almost entirely about heavy computation.
What languages are you considering that have a better story here? Note that better story has to mean more than "syntax-level support" -- I run highly concurrent services in Python right now using Twisted without language level support, and it's not always obvious in which ways language level support would make things nicer in ways that aren't already implemented (e.g generators + @inlineCallbacks).